Relevant bibliographies by topics / Astronomer

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Astronomer'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 July 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Astronomer.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Astronomer"

1

Ampollini, Ilaria. "Celestial Globes and Popular Astronomy." Nuncius 34, no. 1 (February 25, 2019): 69–98. http://dx.doi.org/10.1163/18253911-03401003.

Full text
Abstract:
Abstract This contribution aims to examine the scientific relationship between Giuseppe Toaldo and Jérôme Lalande, focusing on two works by the French astronomer which Toaldo translated into Italian. The first text is the Abregé d’ Astronomie (Compendio d’Astronomia, Padova: Stamperia del Seminario, 1777), addressed to students of astronomy; the second one is the Astronomie des Dames (Astronomia delle Dame, [Venezia]: Giacomo Storti, 1796), written for a female public to which Toaldo interestingly added the appendix Astronomia de’ Gentiluomini (Venezia, 1797). These works clearly testify Toaldo’s deep interest in the teaching and spreading of astronomy, an interest Toaldo shared with Lalande. The contacts between the two astronomers we will be displaying will also allow us to make some hypothesis about two splendid globes, a terrestrial and a celestial one. It is unknown how they arrived in the library of the Episcopal Seminar of Padova, where they are preserved today.
APA, Harvard, Vancouver, ISO, and other styles
2

SPIEGEL, RICHARD J. "John Flamsteed and the turn of the screw: mechanical uncertainty, the skilful astronomer and the burden of seeing correctly at the Royal Observatory, Greenwich." British Journal for the History of Science 48, no. 1 (March 5, 2014): 17–51. http://dx.doi.org/10.1017/s0007087413000952.

Full text
Abstract:
AbstractCentring on John Flamsteed (1646–1719), the first Astronomer Royal, this paper investigates the ways in which astronomers of the late seventeenth century worked to build and maintain their reputations by demonstrating, for their peers and for posterity, their proficiency in managing visual technologies. By looking at his correspondence and by offering a graphic and textual analysis of the preface to his posthumous Historia Coelestis Britannica (1725), I argue that Flamsteed based the legitimacy of his life's work on his capacity to serve as a skilful astronomer who could coordinate the production and proper use of astronomical sighting instruments. Technological advances in astrometry were, for Flamsteed, a necessary but not a sufficient condition for the advancement of astronomy. Technological resources needed to be used by the right person. The work of the skilful astronomer was a necessary precondition for the mobilization and proper management of astronomical technologies. Flamsteed's understanding of the astronomer as a skilled actor importantly shifted the emphasis in precision astronomical work away from the individual observer's ability to see well and toward the astronomer's ability to ensure that instruments guaranteed accurate vision.
APA, Harvard, Vancouver, ISO, and other styles
3

Bennett, M., A. Fraknoi, and J. Richter. "Project ASTRO: A Successful Model for Astronomer/Teacher Partnerships." International Astronomical Union Colloquium 162 (1998): 249–55. http://dx.doi.org/10.1017/s0252921100115192.

Full text
Abstract:
Project ASTRO is designed to improve astronomy education and science literacy in grades 4-9 by creating effective working partnerships between teachers/youth leaders and astronomers (both professional and amateur). Key elements of the program include:•training the teachers/youth leaders and astronomers together in inquiry-based “hands-on, minds-on” learning activities•encouraging an active working partnership between the astronomer and the teacher/youth leader•encouraging multiple visits by the astronomer to the classroom or youth group meetings.
APA, Harvard, Vancouver, ISO, and other styles
4

Turaj, Katarzyna. "Amateur Astronomy in Poland: Past and Present." International Astronomical Union Colloquium 98 (1988): 40–43. http://dx.doi.org/10.1017/s0252921100092137.

Full text
Abstract:
Amateur astronomy in Poland has its own history dating from the 17th century to the present day. Before the 17th century, the term “amateur astronomer” loses its meaning. Otherwise we might pose the rather paradoxical question: “Was Copernicus an amateur?” and probably have to give the answer: “Yes, he was an amateur, being first a priest, a physician and a lawyer.” Let us leave him in peace and instead turn to more undoubted amateurs. The history can be divided into two general periods: before and after the creation of the Polish Amateur Astronomical Society, PA AS (Polskie Towarzystwo Milosników Astronomii – PTMA). Here we present 16 Polish amateur astronomers who contributed to astronomy from the 17th to the 20th centuries, except Jan Heweliusz – the greatest – who is discussed elsewhere (1). All are selected from a much larger group, the selection being made in accordance with the rules described in the very useful and practical “Criteria for identifying an astronomer as an amateur”, formulated by Tom Williams a few years ago and presented here (2). There is also a short history and current information about the PAAS. Finally, we summarize successes and failures of amateur astronomy in Poland and put some general questions about its future.
APA, Harvard, Vancouver, ISO, and other styles
5

Percy, J. R. "The Role of Amateur Astronomers in Astronomy Education." International Astronomical Union Colloquium 162 (1998): 205–10. http://dx.doi.org/10.1017/s0252921100115106.

Full text
Abstract:
Let us begin by defining “amateur astronomer”. According to a dictionary, an amateur astronomer is “someone who loves astronomy, and cultivates it as a hobby”. At IAU colloquium 98 (The Contributions of Amateurs to Astronomy), Williams (1988) discussed this issue at length. He proposed that, to be an amateur astronomer, one must be an astronomer - able to do astronomy with some degree of skill; he then defined an amateur astronomer as “someone who carries out astronomy with a high degree of skill, but not for pay”.
APA, Harvard, Vancouver, ISO, and other styles
6

Podorvanyuk, N. "The challengers of an astronomer being a journalist." Proceedings of the International Astronomical Union 10, H16 (August 2012): 645. http://dx.doi.org/10.1017/s1743921314012666.

Full text
Abstract:
AbstractAs the weakness of russian astronomers in observational astronomy became chronic Russia should enter European Southern Observatory. But the Russian government is still not providing any financing of the entrance of Russia to ESO. The author states this situation as an example of his experience of work as an astronomer and as a journalist at the same time.
APA, Harvard, Vancouver, ISO, and other styles
7

Williams, Thomas R. "Criteria for Identifying an Astronomer as an Amateur." International Astronomical Union Colloquium 98 (1988): 24–25. http://dx.doi.org/10.1017/s0252921100092071.

Full text
Abstract:
While significant contributions of amateur astronomers are generally recognized in the literature, the identification of the individual as an amateur is frequently unclear. As a result, amateur astronomers today have a limited sense of the contributions of earlier amateur astronomers. In part, this problem stems from current usage of the word “amateurish” as a pejorative, representing something not well-done or lacking in quality. In addition, many individuals, who take pride in identifying themselves as amateur astronomers are neither inclined, nor in fact capable, of making a contribution to astronomy. It is important, however, for historians and others who write about the history of astronomy to recognize amateur astronomers and identify the significance of their contributions. For it is through such elaboration that other amateurs will recognize the possibilities and great value that may be associated with their own efforts. Therefore it is necessary to develop a common understanding of the characteristics that distinguish an amateur astronomer from what I identify in this paper as a “recreational sky observer”. Such a classification scheme should help future writers to correctly identify amateur astronomers and their contributions.
APA, Harvard, Vancouver, ISO, and other styles
8

Iwaniszewska, Cecylia. "The Contribution of Amateur Astronomers to Astronomy Education." International Astronomical Union Colloquium 105 (1990): 328–32. http://dx.doi.org/10.1017/s0252921100087054.

Full text
Abstract:
I would like to dedicate this paper to the memory of my husband, Henryk Iwaniszewski, an astronomer working in radio astronomy and electronics, who until his untimely death seven years ago had been very active as president of our local branch of the Polish Amateur Astronomers Association. He was especially keen about introducing astronomy to the general public.I want to speak here mainly, but not exclusively, about the IAU Colloquium No. 98, “Contribution of Amateur Astronomers to Astronomy,” which was held in 1988 in Paris. First of all, some definitions. Thomas Williams of the American Association of Variable Star Observers (AAVSO), from Houston, Texas, introduced at the conference several criteria for identification — first of astronomers, and then of professionals and amateurs. According to Williams:
APA, Harvard, Vancouver, ISO, and other styles
9

Smith, Robert W. "Stellar movements and working hypotheses: A.S. Eddington’s early astronomical career." Journal for the History of Astronomy 53, no. 4 (October 18, 2022): 394–414. http://dx.doi.org/10.1177/00218286221121913.

Full text
Abstract:
Arthur Stanley Eddington (1882–1944) was one of the leading astrophysicists of the first half of the 20th century. He is remembered today chiefly for his research into stellar structure and general relativity, both of which he began to explore in the mid-1910s. He was also a key participant in the famous eclipse expeditions of 1919 that tested Einstein’s theory of gravity. Rather than consider these topics, in this paper I will instead examine Eddington’s early astronomical career, that is, from 1906 to about 1915. In this period, he became a well-trained practical astronomer. Eddington also established himself as a brilliant theoretical astronomer, and in so doing helped to create the role of theoretical astrophysicist through his research into star streaming. He was also, unusually for astronomers of this period, an enthusiastic advocate of the use of “working hypotheses” as crucial tools in astronomical practice. The study of Eddington’s early career therefore has much to tell us about the nature of astronomy in the years around 1910 and about Eddington. The paper underlines, for example, the continuing relevance of the “Greenwich-Cambridge Axis” for the power structure of British astronomy, and the importance of the so-called Sidereal Problem for astronomers at this time even though today it is largely forgotten.
APA, Harvard, Vancouver, ISO, and other styles
10

DeVorkin, David H. "When to Send Your Telescope Aloft." Journal for the History of Astronomy 50, no. 3 (August 2019): 265–305. http://dx.doi.org/10.1177/0021828619864723.

Full text
Abstract:
How have astronomers and physicists responded to the challenge of getting “beyond the atmosphere” in the past century or so, and how did they go about making choices in how they did so? This case study examines a particularly poignant example of how an astronomer’s practice changed in the 1950s when that astronomer, Princeton theoretical astrophysicist Martin Schwarzschild, made a commitment to utilize newly improved balloon technology to answer a specific question arising from his own research agenda. Here we follow Schwarzschild’s efforts, which led initially to success, and then examine how, bolstered by his department Chairman, Lyman Spitzer, he built upon that success to generalize the new technology to try to provide a capability that might address a wider range of questions, and, aiding Spitzer’s plan, provide a stepping stone to an eventual Large Space Telescope. How he fared in making this decision reveals the challenges facing academic astronomers in the 1950s who attempted to send their telescopes aloft. It also reveals the complexities of taking on such projects, complexities that were unknown to the average mainstream astronomer.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Astronomer"

1

Fisher, John Roger. "Astronomy and patronage in Hanoverian England : the work of James Bradley, third Astronomer Royal of England." Thesis, Imperial College London, 2004. http://hdl.handle.net/10044/1/8318.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Slagle, Judith Bailey. "The Poet and the Astronomer: Joanna Baillie’s Intersections with Sir John Herschel." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/etsu-works/3216.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Enlund, Joachim. "Utanför "vetenskapens råmärken" : Svenska astronomer och frågan om utomjordiskt liv under perioden 1880-1940." Thesis, Uppsala University, Department of History of Science and Ideas, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-113803.

Full text
Abstract:

 

Syftet med denna uppsats är att studera hur svenska astronomer under perioden 1880-1940 närmade sig frågan om utomjordiskt liv. En stor vikt har lagts vid att se på vilket sätt som frågan om utomjordiskt liv hörde till populärvetenskapen, och hur detta påverkade det sätt som astronomerna skrev om den på. Ett vidare syfte har varit att undersöka på vilket sätt som frågan var förbunden med dåtida inomvetenskapliga och utomvetenskapliga åskådningar. I samband med detta uppmärksammas Svante Arrhenius idé om panspermi, det vill säga att livet hade kommit till jorden från yttre rymden, och hur denna idé förutsatte ett biologiskt universum. Uppsatsen avslutas med ett försök till att nyansera de utomvetenskapliga följderna av idén om ett biologiskt universum.

APA, Harvard, Vancouver, ISO, and other styles
4

Mosley, Adam John. "Bearing the heavens : astronomers, instruments and the communication of astronomy in early-modern Europe." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621908.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

de, Cruz Pérez Javier. "Implications of Dynamical Dark Energy in the expansion of the Universe and the Structure Formation." Doctoral thesis, Universitat de Barcelona, 2021. http://hdl.handle.net/10803/671792.

Full text
Abstract:
En aquesta tesi s’estudien diferents models cosmològics, tots ells caracteritzats per considerar, de manera efectiva, una lleu evolució temporal de l’Energia Fosca, en contrast amb l’actual model estàndard de la cosmologia. El terme Energia Fosca s’utilitza per fer referència a una misteriosa forma d’energia que sembla impregnar tots els racons del Univers i que provoca que les galàxies s’allunyin les unes de les altres. El ritme predit d’expansió del Univers varia d’un model a un altre així com la quantitat d’estructura observada i la distribució d’aquesta. Degut al bon moment de la cosmologia observacional tenim a la nostre disposició una gran quantitat de dades que ens permeten posar a prova els diferents models existents. Un exemple d’aquests models, seria el Running Vacuum Model (RVM), que ha estat estudiat en detall en aquesta tesi i que considera una expressió per la densitat d’energia del buit motivada en el context de les Teories Quàntiques de Camp. Un altre exemple de models cosmològics serien els anomenats models de camp escalar que suposen que l’equació d’estat de l’Energia Fosca, en el moment present, és lleugerament diferent del valor predit pel model estàndard. No noées s’han considerat models acomodats dins del marc de la teoria de la Relativitat General, sinó que també s’han estudiat les prediccions teòriques del model presentat per Brans i Dicke al 1961 i que resulta ser el primer intent d’extensió de la teoria d’Einstein. El model de Brans i Dicke està caracteritzat pel fet que la interacció gravitatòria està no només mediada per un camp tensorial, sinó també per un camp escalar. Les prediccions teòriques dels diferents models estudiats, tant a nivell de background com a nivell de pertorbacions, han sigut contrastades amb les mes recents dades cosmològiques revelant que l'anteriorment esmentada evolució temporal de l’Energia Fosca ajuda a rebaixar, de manera considerable, algunes de les tensions que afecten al model estàndard. La comparació teoria-observacions s’ha dut a terme mitjançant una rigorosa metodologia que involucra diferents eines estadístiques. Per tant les conclusions obtingudes al llarg d’aquesta tesi es basen en un procés robust i en un estudi detallat dels diferents models cosmològics considerants.
The high quality observations performed during the last two decades, have allowed to demonstrate, with high confidence range, that the Universe is in expansion and to be more precise in accelerated expansion. In order to explain the accelerated evolution the name of dark energy was coined. It refers to a some mysterious form of diffuse energy presumably permeating all corners of the Universe as a whole. We may say that the canonical picture of our Universe defined in the framework of General Relativity, whose field equation were found by Einstein in 1917, is built upon the assumption that the observed acceleration is caused, in fact, by a rigid cosmological constant term denoted by Λ. Thanks to the aforementioned cosmological measurements, we have been able to pin down its value to an impressive level. Dark energy is not the only element, beyond the conventional baryons and photons, required by the observations since we also need large amounts of what is commonly call as dark matter. We call such an overall picture of the Universe the “concordance (or standard) cosmological model” or simply ΛCDM. Therefore, we attribute the observed accelerated expansion of the Universe to the existence of a repulsive force, exerted by the Λ term, which works against the attractive gravitational force and tends to push the clusters of galaxies apart at a speed continuously increasing with the cosmic expansion. Throughout this thesis a wide variety of models, beyond the standard model have been studied. The corresponding analyses have been carried out by studying in detail the theoretical predictions at the background and perturbation level, with the purpose of testing them with the large amount of cosmological data which we currently we have access to. The ultimate goal is to see if we can detect signals of new physics that help to alleviate some of the tensions that affect the ΛCDM. The concordance model, has remained robust and unbeaten for a long time since it is roughly consistent with a large body of cosmological data. Because of this fact, it is not reasonable to look for models with a very different behaviour than the ΛCDM, but to study models that exhibit small departures with respect to the standard model in key aspects. We have studied the Running Vacuum Models (RVM) in depth. They are characterized by having a time-evolving vacuum energy density, whose functional expression is motivated in the context of Quantum Field Theory in curved space-time. It is fundamental that its expression contains a constant term, which mimics the standard behaviour in order to first generate the transition from a decelerated to an accelerated Universe and to ensure that the fit of the structure formation data is not ruined. We have also studied the Peebles & Ratra model, which is a particularly successful scalar field model φCDM for which the potential takes the form V (φ) ∼ φ−α . The dimensionless parameter α encodes the extra degree of freedom that this model has with respect to the standard model. It is found to be small and positive, therefore V (φ) can mimic and approximate cosmological constant that is decreasing slowly with time. In the late Universe the contribution of the scalar field, φ, surfaces over the matter density, thus becoming the dominant component. Not all the models studied are motivated within a theoretical framework, since we have also considered some interesting phenomenological approaches. Last but not least, at the end of the thesis the Brans & Dicke (BD) gravity model was studied in detail. The main feature of this model is that the Newtonian constant coupling GN is replaced by a dynamical scalar field G(t) = 1/ψ(t), coupled to the curvature. As a consequence the gravitational interaction is not only mediated by the metric field, as in the General Relativity case but also for the aforementioned scalar field ψ. The obtained results clearly point out to an interesting conclusion, those models which consider an effective time-evolving dark energy are able to alleviate some of the tensions affecting the ΛCDM. Among the different tensions there are two that stand out, namely the σ8 -tension and the H0-tension.
APA, Harvard, Vancouver, ISO, and other styles
6

Kuutmann, Andrej. "Photo-evaporation of Globulettes : Numerical hydrodynamic studies of photo-evaporating low-mass globules in the Rosette Nebula." Thesis, Stockholm University, Department of Astronomy, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8354.

Full text
Abstract:

In this work, the long-term evolution of globulettes, low-mass globules found in H II regions, is studied through numerical hydrodynamic simulations. It has been proposed by Gahm et al. (2007) that these clouds may form free-floating planetary mass objects due to shock compression, caused by heating from the intense UV radiation of the central OB star cluster. To address this possibility, lifetimes are calculated for three different 3D simulated cases, similar to globulettes found in the Rosette Nebula. A plane-parallel approximation of the radiation field is used, as well as an inhomogeneous initial density distribution. The ionizing radiation will cause the globulettes to photo-evaporate, creating a rocket acceleration effect from the mass ejected on the heated side of the cloud. For a typical globulette with an initial mass of 29.5 Jupiter masses a lifetime of 50 000 yrs is estimated. This estimate is compared to the analytical models of Mellema et al. (1998) and Bertoldi and McKee (1990) which suggest longer lifetimes; the discrepancy is attributed to fragmentation of the clouds in the numerical simulation, which is not adequately described by the models. Synthesized H-alpha images and lightcurves are presented, indicating that the bright rims of small clouds are only likely to be visible in dim parts of the Rosette Nebula. The morphology of simulated clouds generally agrees with observations. While the code does not include self-gravity, the gravitational stability of the clouds is studied indirectly. It is concluded that clouds in the planetary mass range are stable against gravitational collapse, from supporting thermal pressure alone, when in pressure equilibrium with the heated ionization front. However, gravity may play a significant role during the initial shock compression.

APA, Harvard, Vancouver, ISO, and other styles
7

Brogt, E. "Pedagogical and curricular thinking of professional astronomers teaching the Hertzsprung-Russell diagram in introductory astronomy courses for non-science majors." Thesis, University of Canterbury. University Centre for Teaching and Learning, 2009. http://gradworks.umi.com/33/52/3352344.html.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Brogt, Erik. "Pedagogical and Curricular Thinking of Professional Astronomers Teaching the Hertzsprung-Russell Diagram in Introductory Astronomy Courses for Non-Science Majors." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195246.

Full text
Abstract:
This qualitative study explores the pedagogical and curricular thinking of five professional astronomers, faculty at a university, about teaching the Hertzsprung-Russell diagram in introductory astronomy courses for non-science majors. Data sources for this study included two semi-structured interviews per participant, in which they were asked about teaching the Hertzsprung-Russell diagram, as well as about the introductory course in general. In addition, participants were asked to complete four cognitive tasks; the creation of a lesson plan, a concept map on how they would like their students to think about the Hertzsprung-Russell diagram at the end of the course, a Pathfinder network rating task, and responding to stereotypical student statements regarding the Hertzsprung-Russell diagram.The data was analyzed using a case study approach, followed by a discussion of themes that emerged from the data. Results indicate that participants had primarily affect and process goals for the course, rather than content goals. In addition, they wanted students to view the HR diagram as a part of a flow chart, where input physics (both observed and inferred properties of stars) leads to the construction of the HR diagram, which in turn is used to make inferences about stellar evolution. Participants identified several student difficulties with the HR diagram, among which interpreting a graph was the most pertinent. In several stereotypical student statements, participants responded using the exact same analogies to explain the concepts to the students. This may be indicative of some underlying pedagogical content knowledge.
APA, Harvard, Vancouver, ISO, and other styles
9

Bernal, Mera José Luis. "Cosmology on the Edge of Lambda-Cold Dark Matter." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667707.

Full text
Abstract:
Cosmology is the science that studies the Universe as whole, aiming to understand its origin, composition and evolution. During the last decades, cosmology has transitioned from a “data staved” to a “data driven” science, inaugurating what is known as precision cosmology. This huge observational effort has confirmed and fostered theoretical research, and established the standard model of cosmology: Lambda-Cold Dark Matter (LCDM). This model successfully reproduces most of the observations. However, there are some persistent tensions between experiments that might be smoking guns of new physics beyond this model. Anyways, there is a difference between modeling and understanding, and LCDM is a phenomenological model that, for instance, does not describe the nature of the dark matter or dark energy. This thesis collects part of my research focused on pushing the limits of the standard cosmological model and its assumptions, regarding also existing tensions between experiments. New strategies to optimize the performance of future experiments are also proposed and discussed. The largest existing tension is between the direct measurements of the Hubble constant using the distance ladder in the local Universe and the inferred value obtained from observations of the Cosmic Microwave Background when LCDM is assumed. A model independent reconstruction of the late-time expansion history of the Universe is carried out, which allows us to identify possible sources and solutions of the tension. We also introduce the concept of the low redshift standard ruler, and measure it in a model independent way. Finally, we introduce a statistical methodology to analyze several data sets in a conservative way, no matter the level of discrepancy between them, accounting for the potential presence of systematic errors. The role of primordial black holes as candidates for dark matter is addressed in this thesis, too. Concretely, the impact of an abundant population of primordial black holes in the rest of cosmological parameters is discussed, considering also populations with extended mass distributions. In addition, massive primordial black holes might be the seeds that are needed to explain the origin of the supermassive black holes located in the center of the galaxies. We predict the contribution of a population of massive primordial black holes to the 21 cm radiation from the dark ages. This way, observations of the 21 cm intensity mapping observations of the dark ages could be used to ascertain if the seeds of the supermassive black holes are primordial. Finally, we estimate the potential of radio-continuum galaxy surveys to constrain LCDM. These kind of experiments can survey the sky quicker than spectroscopic and optical photometric surveys and cover much larger volumes. Therefore, they will be specially powerful to constrain physics which has impact on the largest observable scales, such as primordial non Gaussianity. On the other hand, intensity mapping experiments can reach higher redshifts than galaxy surveys, but the cosmological information of this signal is coupled with astrophysics. We propose a methodology to disentangle astrophysics and optimally extract cosmological information from the intensity mapping spectrum. Thanks to this methodology, intensity mapping will constrain the expansion history of the Universe up to reionization, as shown in this thesis.
El modelo estándar de cosmología, LCDM, se apoya en una cantidad ingente de observaciones extremadamente precisas, que es capaz de reproducir con gran exactitud. Sin embargo, este es un modelo fenomenológico que no es capaz de responder algunas de las preguntas fundamentales sobre el Universo, como la naturaleza de la materia oscura o la energía oscura. Además, cuando este modelo se utiliza para interpretar las observaciones, aparecen tensiones entre experimentos independientes. Estas tensiones, en el caso de no estar producidas por errores sistemáticos no tenidos en cuenta, necesitarían un modelo cosmológico diferente para ser resueltas. Esta tesis recoge trabajos publicados en revistas científicas investigando estos problemas de LCDM. Concretamente, se cubren tres temas principales: la tensión en la constante de Hubble entre las medidas directas usando la escalera de distancias y los valores inferidos a partir de las observaciones de la colaboración Planck asumiendo LCDM; el rol de los agujeros negros primordiales como semillas de los agujeros negros supermasivos, o como candidato para conformar una parte significativa de la materia oscura; y el potencial y las estrategias óptimas a aplicar en experimentos que mapean la estructura a gran escala del Universo para examinar LCDM y medir posibles desviaciones del modelo. De este modo, el trabajo aquí recogido tiene como objetivo investigar las tensiones presentes en LCDM, así como las preguntas que deja sin responder de una manera crítica y desde un punto de vista agnóstico. Además, pretende sentar las bases para futuras investigaciones en estas líneas, cuando estén disponibles nuevas y mejores observaciones, e indicar el camino para poder poner a prueba el modelo estándar de cosmología en los años venideros en regímenes en los que aún no se ha hecho ninguna medida.
APA, Harvard, Vancouver, ISO, and other styles
10

de, Val Borro Miguel. "Studies of Gas Disks in Binary Systems." Doctoral thesis, Stockholms universitet, Institutionen för astronomi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-8337.

Full text
Abstract:
There are over 300 exoplanets detected through radial velocity surveys and photometric studies showing a tremendous variety of masses, compositions and orbital parameters. Understanding the way these planets formed and evolved within the circumstellar disks they were initially embedded in is a crucial issue. In the first part of this thesis we study the physical interaction between a gaseous protoplanetary disk and an embedded planet using numerical simulations. In order to trust the results from simulations it is important to compare different methods. However, the standard test problems for hydrodynamic codes differ considerably from the case of a protoplanetary disk interacting with an embedded planet. We have carried out a code comparison in which the problem of a massive planet in a protoplanetary disk was studied with various numerical schemes. We compare the surface density, potential vorticity and azimuthally averaged density profiles at several times. There is overall good agreement between our codes for Neptune and Jupiter-sized planets. We performed simulations for each planet in an inviscid disk and including physical viscosity. The surface density profiles agree within about 5% for the grid-based schemes while the particle codes have less resolution in the low density regions and weaker spiral wakes. In Paper II, we study hydrodynamical instabilities in disks with planets. Vortices are generated close to the gap in our numerical models in agreement with the linear modal analysis. The vortices exert strong perturbations on the planet as they move along the gap and can change its migration rate. In addition, disk viscosity can be modified by the presence of vortices. The last part of this thesis studies the mass transfer in symbiotic binaries and close T Tauri binary systems. Our simulations of gravitationally focused wind accretion in binary systems show the formation of stream flows and enhanced accretion rates onto the compact component.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Astronomer"

1

Ian, Graham. Astronomer. New York: Gloucester Press, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Stott, Carole. New astronomer. Edited by Gallagher Amie. New York: DK Pub., 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Sunmi. The astronomer. [Place of publication not identified]: Sunmi, 2016.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Goldstone, Lawrence. The astronomer. New York: Walker & Co., 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Stott, Carole. New astronomer. London: Dorling Kindersley, 1999.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Lovell, Bernard. Astronomer by chance. New York: Basic Books, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Moore, Patrick. The Amateur Astronomer. London: Springer London, 2006. http://dx.doi.org/10.1007/1-84628-286-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Descoteaux, Gerry. The lawnchair astronomer. New York: Dell Pub., 1995.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Ian, Ridpath, ed. The young astronomer. Twickenham: Hamlyn, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

J, Edberg Stephen, ed. The practical astronomer. New York: Simon and Schuster, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Astronomer"

1

Goss, W. M., Claire Hooker, and Ronald D. Ekers. "The Galactic Centre, 1951–1954." In Historical & Cultural Astronomy, 337–59. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-07916-0_23.

Full text
Abstract:
AbstractThe discovery of radio source Sagittarius A (Sgr A) and its association with the centre of the Milky Way is a fascinating story, involving RPL personnel and prominent US and Dutch astronomers. When we say “discovery”, however, we do not mean a single event. Contra the conventions in science that award prizes, professional respect and that very nebulous (!) phenomenon of “historical recognition” to individuals, discovery is a lengthy process involving many actors, many different kinds of contributions, and many events. This was understood by one of the actors involved in this story: the famous astronomer Hendrick “Henk” van de Hulst, who had predicted the existence of the HI line at radio frequencies. Reflecting back on the history of radio astronomy, van de Hulst suggested the concept of “nanohertz astronomy”– that is, history of astronomy on a longer timescale.
APA, Harvard, Vancouver, ISO, and other styles
2

Lequeux, James. "Arago Astronomer." In François Arago, 203–34. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-20723-0_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Bulkeley, Rip. "The Astronomer." In Bellingshausen and the Russian Antarctic Expedition, 1819–21, 141–62. London: Palgrave Macmillan UK, 2014. http://dx.doi.org/10.1007/978-1-137-40217-2_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Witt, Volker. "The Social Astronomer." In Handbook of Practical Astronomy, 281–308. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-76379-6_12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

van der Kruit, Pieter C. "Astronomer in Leiden." In Jacobus Cornelius Kapteyn, 53–84. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-10876-6_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Russo, Kate. "Amateur Astronomer Chasers." In Total Addiction, 71–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30481-1_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Beech, Martin. "The Amateur Astronomer." In William Frederick Denning, 139–68. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-44443-2_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Underhill, Anne B. "One Great Lady Astronomer." In Astrophysics and Space Science Library, 94–96. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5173-3_30.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Simpson, Phil. "Hevelius, The Merchant Astronomer." In Patrick Moore's Practical Astronomy Series, 677–722. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6941-5_17.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Simpson, Phil. "Lacaille: Abbe and Astronomer." In Patrick Moore's Practical Astronomy Series, 723–807. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6941-5_18.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Astronomer"

1

Quinton, Michael, Iain McGregor, and David Benyon. "Sonification of Exosolar System Accretion Discs." In ICAD 2021: The 26th International Conference on Auditory Display. icad.org: International Community for Auditory Display, 2021. http://dx.doi.org/10.21785/icad2021.021.

Full text
Abstract:
This study investigated the design and evaluation of a sonification, created for an astronomer who studies exosolar accretion discs. User design methods were applied to sonify data that could allow the classification of accretion discs. The sonification was developed over three stages: a requirements gathering exercise that inquired about the astronomer’s work and the data, design and development, as well as an evaluation. Twenty datasets were sonified and analysed. The sonification effectively represented the accretion discs allowing the astronomer to commence a preliminary, comparative classification. Multiple parameter mappings provide rich auditory stimuli. Spatial mapping and movement allow for easier identification of fast changes and peaks in the data which improved the understanding of the extent of these changes.
APA, Harvard, Vancouver, ISO, and other styles
2

Dimitrijević, Milan S. "TEODOR METOHIT I NjEGOV UČENIK NIĆIFOR GRIGORA NA DVOROVIMA KRALjA MILUTINA I STEFANA DEČANSKOG." In Kralj Milutin i doba Paleologa: istorija, književnost, kulturno nasleđe. Publishing House of the Eparchy of Šumadija of the Serbian Orthodox Church - "Kalenić", 2023. http://dx.doi.org/10.46793/6008-065-5.223d.

Full text
Abstract:
Theodore Metochites (Θεόδωρος Μετοχίτης; 1270–1332), a Byzantine Greek statesman and polymath, and his student, the greatest Byzantine astronomer Nicephoros Gregoras (1295-1360) were in several diplomatic missions on the courts of King Milutin and his son, King Stefan Dečanski. Both gave significant contributions in astronomy. Metochites, considered as the one of the greatest forerunners of the Renaissance in the Greek world, was a Platonist philosopher, astronomer and patron of the arts. From 1305 to 1328 he held the position of personal adviser (mesazon) to emperor Andronikos II Palaiologos. During his long political career he was also Great Logothetes (a kind of Prime Minister) of the Byzantine Empire. His teacher in astronomy was Manuel Bryennius. His known astronomical writting is an introduction to the study of Ptolemaic astronomy (Στοιχείωσις επί τη αστρονομική επιστήμη). Related to astronomy is also his paraphrases of Aristotle's works on natural philosophy and Σημειώσεις γνωμικαί (Annotations), where he provided an important critique of Aristotle. Metochites was five times on the court of King Milutin as the envoy of Andronikos II to make the peace with Serbia and to arrange the mariage of King Milutin with Simonida, grand daughter of the Byzantine emperor. He wrote a writting about his travels to Serbia (Пρεσβευτικός) which is translated to Serbian.
APA, Harvard, Vancouver, ISO, and other styles
3

Kuznetsov, E. D., S. V. Salii, and T. S. Polushina. "Polina Evgenievna Zakharova." In Всероссийская с международным участием научная конференция студентов и молодых ученых, посвященная памяти Полины Евгеньевны Захаровой «Астрономия и исследование космического пространства». Ural University Press, 2021. http://dx.doi.org/10.15826/b978-5-7996-3229-8.01.

Full text
Abstract:
The article is dedicated to the memory of Polina Evgenievna Zakharova (12.03.1940—28.09.2020), our Teacher, stellar astronomer, Candidate of Science in Physics and Mathematics, director of the Kourovka Astronomical Observatory of the Ural University (1982—2016), inspirer and organizer All-Russian student scientific conferences ”Physics of Space”, the author of the teaching-visual aid Calendar ”Astronomy”, a member of a number of professional councils and societies, a person selflessly devoted to her work — the development of astronomy in the Middle Urals and in Russia.
APA, Harvard, Vancouver, ISO, and other styles
4

Pennestri`, Ettore, Pier Paolo Valentini, and Ferdinando Petti. "Kinematic Analysis of the Antikythera Gear Mechanism by Means of Graph Theory." In ASME 2002 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/detc2002/edc-34379.

Full text
Abstract:
The Antikythera mechanism is one of the most extraordinary examples of the degree of sophistication reached by the Hellenistic culture in the field of mechanism design. This calendar mechanism not only witness the degree of astronomic knowledge of the greeks, but also their capability to conceive and build marvelous mechanical devices. The mechanism is the first documented example of differential gear arrangement in western culture. The paper gives first a description of the kinematic structure of the mechanism in terms by means of a graph, then a full kinematic analysis of this complex gear train is performed. The results of our kinematic analysis, only partially coincident with those obtained by De Solla Price, match very closely the discoveries made by the Greek astronomer Hipparcus about the duration of the lunar months. There is also a conjecture on the kinematic structure and gear dimensions of some of the missing parts. In the Appendix is reported the listing of the Maple program developed for the kinematic analysis.
APA, Harvard, Vancouver, ISO, and other styles
5

Hochberg, Eric B., and Norman A. Page. "First-Order Optical Design Considerations for Spaced-Based Array Telescopes." In Space Optics for Astrophysics and Earth and Planetary Remote Sensing. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/soa.1988.wb9.

Full text
Abstract:
For the purpose of comparing the various optical design approaches for a space-based array telescope, the following performance goals will be used: The UV operational goal is motivated by the desire to obtain information inaccessible to the ground based astronomer while the 30 meter baseline obtains from the desire for milliarc-second class angular resolution;
APA, Harvard, Vancouver, ISO, and other styles
6

Kim, I. S. "GENNADY M. NIKOLSKY, A PROMINENT ASTRONOMER AND A BRILLIANT PERSON." In All-Russia Conference on Solar and Solar-Terrestrial Physics. The Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, 2019. http://dx.doi.org/10.31725/0552-5829-2019-205-208.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Callow, Megan. "An Astronomer out of Water: How Teachers' Disciplinary Background Shapes Science Writing Instruction." In 2020 AERA Annual Meeting. Washington DC: AERA, 2020. http://dx.doi.org/10.3102/1586640.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Kassis, Marc, Gregory D. Wirth, Andrew C. Phillips, and Charles C. Steidel. "The slitmask alignment tool: robust, efficient, and astronomer-friendly software for aligning multi-object slitmasks." In SPIE Astronomical Telescopes + Instrumentation, edited by Alison B. Peck, Robert L. Seaman, and Fernando Comeron. SPIE, 2012. http://dx.doi.org/10.1117/12.926693.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Zins, Gerard, Francois Lacombe, Jens Knudstrup, David Mouillet, Didier Rabaud, Stephane Marteau, Laurent Rousset-Rouviere, et al. "NAOS computer-aided control: an optimized and astronomer-oriented way of controlling large adaptive optics systems." In Astronomical Telescopes and Instrumentation, edited by Hilton Lewis. SPIE, 2000. http://dx.doi.org/10.1117/12.388412.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Rouverand, Léa, Cerise Cuny, Elena López-Contreras González, Marine Prunier, Mathéo Fouchet, Nicolas Wattelle, Valentine Bourgeois, Quentin Royer, and Marie Delaroche. "Experiment collaboration program during a Martian analogue mission to introduce young students to human space exploration." In Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.090.

Full text
Abstract:
The last decade has demonstrated an increased public and private interest towards crewed missions through the emergence of New Space and the Artemis program. There is therefore a need to form the next generation of scientists to prepare future crewed space exploration missions. In this context, it is important to familiarize teenagers with the scientific issues of today’s world and to inspire them to engage in the space sector. Crew 263 is a group of seven students preparing a Martian analogue mission at the Mars Desert Research Station (MDRS) in the desert of Utah (United States). A Martian analogue mission at the MDRS, because is the perfect set-up to introduce young students to human space exploration. In the context of their mission, Crew 263 has organized a program of space educational activities for middle and high school students surrounding the topics of altered gravity, astronomy, health and safety procedures and robotic systems. Precisely, a set of four experiments that will be performed by the students was conceived to bring into light the various scientific topics surrounding space exploration missions. The experiment “Plants in Microgravity” aims to illustrate the influence of gravity on plant growth by planting seeds in pots mounted on a rotating platform in a vertical plane, which will disturb their gravitational cues. “Beginner Astronomer” aims to introduce students to astronomy and astrophotography by establishing with the students a list of galaxies/nebulas to be observed during the Mission. Then, for “Emergency situation at the MDRS” students will put into practice the scientific approach by creating protocols to mitigate risk situations during space exploration missions. Finally, for the “Perseverance’s little brother” experiment, students will develop a small rover to analyze the atmosphere condition around the MDRS station. To maximize their involvement, prior to the mission at the MDRS, the middle and high school students prepare the experiments with the support of the crew. Then, the prepared experiment will be performed in parallel with the crew while they are simulating Martian life. To allow students to be immersed in the mission when the crew will be at the MDRS, short podcasts will be recorded describing the crew’s daily life and the evolution of the different experiments. This podcast will be sent to the classes during the simulation, thus allowing the students to have an insight on the daily life of the analogue astronauts at the station.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Astronomer"

1

Corbin, Brenda G. Helping the Astronomer Stay Up-to-Date,. Fort Belvoir, VA: Defense Technical Information Center, April 1998. http://dx.doi.org/10.21236/ada371204.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

McGraw, John T. Astronomy Oriented Science Center. Fort Belvoir, VA: Defense Technical Information Center, November 2001. http://dx.doi.org/10.21236/ada407233.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Hovey, Luke. An Astronomer’s Journey into Radiography. Office of Scientific and Technical Information (OSTI), June 2021. http://dx.doi.org/10.2172/1788390.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Malchenko, Svitlana L., Davyd V. Mykoliuk, and Arnold E. Kiv. Using interactive technologies to study the evolution of stars in astronomy classes. [б. в.], February 2020. http://dx.doi.org/10.31812/123456789/3752.

Full text
Abstract:
In astrophysics, a significant role is played by observations. During astronomy classes in the absence of surveillance tools interactive programmes such as an interactive programme for space objects simulation can be used as Universe Sandbox2. The aim of this work is to implement interactive programmes for effective astronomy teaching, understanding material and increasing cognitive interest. We observe the evolution of stars while using Universe Sandbox2 during the study of the topic “Evolution of stars”. Using this programme students have an opportunity to get acquainted with the existence of stars with different masses, their differences, to observe changes in the physical characteristics of stars such as: mass, temperature, speed velocity, luminosity, radius and gravity. It will help to develop the ability to analyze, to compare, to form scientific worldview, to develop the attraction for research, to raise the interest for studying astronomy.
APA, Harvard, Vancouver, ISO, and other styles
5

Saz Parkinson, P. X-ray Astronomy at SLAC. Office of Scientific and Technical Information (OSTI), April 2005. http://dx.doi.org/10.2172/839834.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Friedman. Adaptive Optics, LLLFT Interferometry, Astronomy. Fort Belvoir, VA: Defense Technical Information Center, March 2002. http://dx.doi.org/10.21236/ada415904.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Zilberman, Mark. Methods to Test the “Dimming Effect” Produced by a Decrease in the Number of Photons Received from Receding Light Sources. Intellectual Archive, November 2020. http://dx.doi.org/10.32370/iaj.2437.

Full text
Abstract:
The hypothetical “Dimming Effect” describes the change of the number of photons arriving from a moving light source per unit of time. In non-relativistic systems, the “Dimming effect” may occur due to the growing distance of light sources moving away from the receiver. This means that due to the growing distance, the photons continuously require more time to reach the receiver, which reduces the number of received photons per time unit compared to the number of emitted photons. Understandably, the proposed “Dimming effect” must be tested (confirmed or rejected) through observations. a. This article provides the formula for the calculation of “Dimming effect” values using the redshift parameter Z widely used in astronomy. b. The “Dimming effect” can possibly be detected utilizing the orbital movement of the Earth around the Sun. In accordance to the “Dimming effect”, observers on Earth will view 1.0001 more photons per time unit emitted by stars located near the ecliptic plane in the direction of the Earth orbiting the Sun. And, in contrast, observers will view only 0.9999 photons per time unit emitted by stars located near the ecliptic plane in the direction opposite to the Earth orbiting the Sun. Calculating precise measurements of the same stars within a 6-month period can possibly detect this difference. These changes in brightness are not only for specific stars, as the change in brightness takes place for all stars near the ecliptic in the direction of the Earth’s orbit around the Sun and in the opposite direction. c. The “Dimming effect” can possibly be detected in a physics laboratory using a moving light source (or mirror) and photon counters located in the direction of travel and in the opposite direction. d. In theory, Dilation of time can also be used for testing the existence of the “Dimming effect.” However, in experiments on Earth this effect appears in only the 14th digit after the decimal point and testing does not appear to be feasible. e. Why is it important to test the “Dimming effect?” If confirmed, it would allow astronomers to adjust values of "Standard Candles" used in astronomy. Since “Standard Candles” are critical in various cosmological models, the “Dimming effect” can correct models and/or reveal and support new models. If it is proved that the “Dimming effect” does not exist, it will mean that the number of photons arriving per unit of time does not depend on the speed of the light source and observer, which is not so apparent.
APA, Harvard, Vancouver, ISO, and other styles
8

Kamae, T. GeV Gamma-Ray Astronomy with GLAST. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/826929.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Dunn, Kathryn. Astronomy / Galactic Structure - Rensselaer Polytechnic Institute. Purdue University, April 2013. http://dx.doi.org/10.5703/1288284315058.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Thompson, D. GLAST: GeV Astronomy in a Multiwavelength Context. Office of Scientific and Technical Information (OSTI), June 2004. http://dx.doi.org/10.2172/826965.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Astronomer' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography