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Dissertations / Theses on the topic 'Solar-type star'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 February 2022

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1

Al-Edhari, Ali Jaber. "Complex organic molecules in solar-type star forming regions." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAY048/document.

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Le but de la présente thèse est l'étude de la compléxité moléculaire dans les régions de formation stellaires. Cette thèse s'axe sur deux classes de molécule aux caractéristiques prébiotiques : les molécules organiques complexes et les cyanopolyynes.Dans ce contexte, j'ai analysé des données d'un seul échantillon de relevés spec- traux en exploitant des codes de transfert radiatif à l'équilibre thermodynamique local (LTE) et/ou non-LTE pour deux sources : une proto-étoile de type solaire dans un environnement calme (IRAS 16293-2422) et un proto-ama constitué de proto-étoile de type solaire (OM

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2

Mengel, Matthew Wayne. "The active young solar-type star HR 1817 (=HD 35850)." University of Southern Queensland, Faculty of Sciences, 2005. http://eprints.usq.edu.au/archive/00001474/.

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The active F dwarf HR 1817 represents the upper temperature extreme of what are broadly termed solar-type stars - stars which have the same internal structure as the Sun, albeit in this case with a much smaller convective zone. To date, studies of the active surface features and magnetic fields of solar-type stars have been restricted to G and K dwarfs. This thesis investigates the surface and magnetic features of HR 1817 using the techniques of Doppler and Zeeman Doppler Imaging, resulting in tomographic maps of the stellar surface and magnetic field. Cooler stars than HR 1817 exhibit large p

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3

Namekata, Kousuke. "Observational Studies of Extreme Stellar Magnetic Activities: Spots, Flares, and Mass Ejections." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263473.

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4

Fuentes, Pineda Rosinda. "Triphenylamine-based hole transport materials for perovskite solar cells." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31410.

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The rapid development in perovskite solar cells (PSC) has generated a tremendous interest in the photovoltaic community. The power conversion efficiency (PCE) of these devices has increased from 3.8% in 2009 to a recent certified efficiency of over 20% which is mainly the product of the remarkable properties of the perovskite absorber material. One of the most important advances occurred with the replacement of the liquid electrolyte with a solid state hole conductor which enhanced PCE values and improved the device stability. Spiro-OMeTAD (2,2',7,7'-tetrakis(N,N'-di-p-methoxyphenylamine)- 9,9

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5

Benbakoura, Mansour. "Evolution des étoiles de faible masse en interaction : observations multi-techniques et modélisation des systèmes multiples." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7027.

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Cette thèse est consacrée à l'étude des étoiles de faible masse ayant dans leur environnement proche d'autres étoiles ou des planètes. Nous nous sommes concentrés sur l'influence des interactions avec ces compagnons sur l'évolution stellaire ainsi que leurs conséquences observables.Dans la première partie, nous présentons le modèle d'évolution des systèmes étoile–planète que nous avons développé au cours de cette thèse, nommé ESPEM (Évolution des Systèmes Planétaires Et Magnétisme). Ce modèle prend en compte de façon ab-initio des effets du vent stellaire magnétisé et de la dissipation de maré

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6

Hawkins, Keith A. "Searching for Solar-Type Hypervelocity Stars." Ohio University Honors Tutorial College / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1367583430.

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7

Notsu, Yuta. "Observational studies on solar-type superflare stars." Kyoto University, 2019. http://hdl.handle.net/2433/242613.

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8

Corporon, Patrice. "La binarité des étoiles Ae/Be de Herbig vue par l'optique adaptative et la spectroscopie : une étude du système triple TY CrA." Phd thesis, Université Joseph Fourier (Grenoble), 1998. http://tel.archives-ouvertes.fr/tel-00724469.

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Les étoiles multiples sont nombreuses, tant parmi les objets jeunes de faible masse, les étoiles T Tauri, que parmi les astres de la Séquence Principale (SP). En ce qui concerne les étoiles jeunes de masse intermédiaire, les étoiles Ae/Be de Herbig (HAeBe), le statut de la binarité est peu connu. Nous avons réalisé une recherche systématique de binaires HAeBe en utilisant deux techniques: l'imagerie à haute résolution angulaire avec la méthode de l'Optique Adaptative d'une part, et la spectroscopie visible à haute résolution d'autre part. Ces techniques complémentaires nous ont permis d'identi

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9

Hamilton, Devon. "Observational signatures of convection in solar type stars." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ58914.pdf.

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10

Mamajek, Eric E. "Identification and characterization of young, nearby, solar-type stars." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280625.

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Post-T Tauri stars (PTTSs) are low-mass, pre-MS stars which have ceased accreting, and are not necessarily near star-forming molecular clouds. Historically, they have been difficult to identify due to their benign spectroscopic signatures. With recent all-sky X-ray surveys and proper motion catalogs, it is now possible to find PTTSs in large numbers. The nearest PTTSs will be important targets for future imaging surveys characterizing dust disks and planetary systems around young solar analogs. The goal of this work is to systematically identify samples of PTTSs, investigate the evolution of c

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11

Sousa, Sérgio António Gonçalves de. "Spectroscopic, interferometric and seismic study of solar-type stars." Tese, Porto : [s.n.], 2009. http://catalogo.up.pt/F?func=find-b&local_base=FCB01&find_code=SYS&request=000103827.

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12

Sousa, Sérgio António Gonçalves de. "Spectroscopic, interferometric and seismic study of solar-type stars." Doctoral thesis, Porto : [s.n.], 2009. http://hdl.handle.net/10216/64296.

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13

Raghavan, Deepak. "A Survey of Stellar Families: Multiplicity of Solar-type Stars." unrestricted, 2009. http://etd.gsu.edu/theses/available/etd-04212009-165714/.

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Thesis (Ph. D.)--Georgia State University, 2009.<br>Title from file title page. Harold A. McAlister, committee chair; Russel J. White, Brian D. Mason, Douglas R. Gies, David W. Latham, A.G. Unil Perera, Todd J. Henry, committee members. Description based on contents viewed Aug. 24, 2009. Includes bibliographical references (p. 391-410).

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14

Önehag, Anna. "Solar Type Stars as Calibrators : A Photometric and Spectroscopic Study on the Atmospheric Properties of Late-type Stars." Doctoral thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-158709.

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Detailed knowledge of solar-type stars is essential in the understanding of the evolutionary past, presence and future of the Sun as well as the formation of its planetary system. Moreover, solar-type stars are of key significance for the study of the evolution of the Galaxy. The ages of solar-type stars map the full galactic evolution. Their surface layers are well mixed and just little affected by the interior nuclear processes. They may therefore be used as samples of the gas from which the stars were once formed. Models of stellar atmospheres are used to derive fundamental stellar quantiti

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15

Hutcheon, Richard J. "Fundamental properties of solar-type eclipsing binary stars, and kinematic biases of exoplanet host stars." Thesis, Keele University, 2015. http://eprints.keele.ac.uk/1202/.

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This thesis is in three parts: 1) a kinematical study of exoplanet host stars, 2) a study of the detached eclipsing binary V1094 Tau and 3) and observations of other eclipsing binaries. Part I investigates kinematical biases between two methods of detecting exoplanets; the ground based transit and radial velocity methods. Distances of the host stars from each method lie in almost non-overlapping groups. Samples of host stars from each group are selected. They are compared by means of matching comparison samples of stars not known to have exoplanets. The detection methods are found to introduce

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16

Currie, Thayne, Olivier Guyon, Motohide Tamura, et al. "Subaru/SCExAO First-light Direct Imaging of a Young Debris Disk around HD 36546." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624379.

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We present H-band scattered light imaging of a bright debris disk around the A0 star HD 36546 obtained from the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system with data recorded by the HiCIAO camera using the vector vortex coronagraph. SCExAO traces the disk from r similar to 0."3 to r similar to 1" (34-114 au). The disk is oriented in a near east-west direction (PA similar to 75 degrees), is inclined by i similar to 70 degrees-75 degrees, and is strongly forward-scattering (g > 0.5). It is an extended disk rather than a sharp ring; a second, diffuse dust population extends from

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17

Telleschi, Alessandra Silvia. "Coronal evolution of solar-like stars : X-ray spectroscopy of stars in star-forming regions and the solar neighborhood /." Zürich : ETH, 2007. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17018.

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18

Kirkpatrick, Joseph Davy. "Spectroscopic and photometric studies of main sequence M stars and a search for late-type dwarfs in the solar vicinity." Diss., The University of Arizona, 1992. http://hdl.handle.net/10150/185978.

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As any introductory astronomy student knows, M dwarfs are the most common stars in the Galaxy and are the faintest of the core hydrogen burners. A comprehensive study of these faint objects is crucial to our understanding of the stellar composition of the Galaxy and necessary for a more complete knowledge of the transition between main sequence M stars and their slightly less massive counterparts, the brown dwarfs, which never achieve hydrogen burning in their cores. In this thesis, a spectroscopic catalog of 125 K and M dwarfs is first presented. This catalog covers the wavelength range from

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19

Sinukoff, Evan, Andrew W. Howard, Erik A. Petigura, et al. "ELEVEN MULTIPLANET SYSTEMS FROM K2 CAMPAIGNS 1 AND 2 AND THE MASSES OF TWO HOT SUPER-EARTHS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621388.

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We present a catalog of 11 multiplanet systems from Campaigns 1 and 2 of the K2 mission. We report the sizes and orbits of 26 planets split between seven two-planet systems and four three-planet systems. These planets stem from a systematic search of the K2 photometry for all dwarf stars observed by K2 in these fields. We precisely characterized the host stars with adaptive optics imaging and analysis of high-resolution optical spectra from Keck/HIRES and medium-resolution spectra from IRTF/SpeX. We confirm two planet candidates by mass detection and validate the remaining 24 candidates to >99

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20

Farrington, Christopher Donald. "The Separated Fringe Packet Survey: Updating Multiplicity of Solar-Type Stars within 22 Parsecs." Digital Archive @ GSU, 2008. http://digitalarchive.gsu.edu/phy_astr_diss/26.

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Over the past half century, multiplicity studies have provided a foundation for the theories of stellar formation and evolution through understanding how likely it is that stars form alone or with companions. If spectroscopic orbits are combined with techniques that can determine visual orbits, we can access the most fundamental parameter of stellar evolution, stellar mass. This dissertation is composed of two main sections. The first involves the investigation of the seminal multiplicity study of Duquennoy & Mayor (1991b) which has been the ``gold standard" for solar-type stars for nearly

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21

Sierchio, Jennifer Marie. "Debris Disks Around Solar-Type Stars: Observations of the Pleiades with Spitzer Space Telescope." Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/144962.

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22

Murdoch, Kaylene A. "A high-precision radial-velocity search for substellar companions to southern solar-type stars." Thesis, University of Canterbury. Astronomy, 1992. http://hdl.handle.net/10092/8073.

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A system has been developed at the Mt John University Observatory to enable relative radial velocities of solar-type stars to be obtained with a characteristic random error of 55 m/s. The high radial-velocity precision has been achieved by interfacing a single optical fibre feed between the telescope and spectrograph, which has enabled the spectrograph to be mounted in a thermally and mechanically stable configuration and has virtually eliminated guiding errors. Using this system, a programme of observation of 29 solar-type stars and 10 giant International Astronomical Union radial-velocity s

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23

Baumann, Patrick. "The chemical composition of solar-type stars and its impact on the presence of planets." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-156280.

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24

Sperauskas, J., S. Bartašiūtė, R. P. Boyle, V. Deveikis, S. Raudeliūnas, and A. R. Upgren. "Radial velocities of K–M dwarfs and local stellar kinematics." EDP SCIENCES S A, 2016. http://hdl.handle.net/10150/622691.

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Aims. The goal of this paper is to present complete radial-velocity data for the spectroscopically selected McCormick sample of nearby K-M dwarfs and, based on these and supplementary data, to determine the space-velocity distributions of late-type stars in the solar neighborhood. Methods. We analyzed nearly 3300 measurements of radial velocities for 1049 K-M dwarfs, that we obtained during the past decade with a CORAVEL-type instrument, with a primary emphasis on detecting and eliminating from kinematic calculations the spectroscopic binaries and binary candidates. Combining radial-velocity d

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25

Schneider, Glenn, Carol A. Grady, Christopher C. Stark, et al. "DEEP HST /STIS VISIBLE-LIGHT IMAGING OF DEBRIS SYSTEMS AROUND SOLAR ANALOG HOSTS." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621501.

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We present new Hubble Space Telescope observations of three a priori known starlight-scattering circumstellar debris systems (CDSs) viewed at intermediate inclinations around nearby close-solar analog stars: HD 207129, HD 202628, and HD 202917. Each of these CDSs possesses ring-like components that are more massive analogs of our solar system's Edgeworth-Kuiper Belt. These systems were chosen for follow-up observations to provide imaging with higher fidelity and better sensitivity for the sparse sample of solar-analog CDSs that range over two decades in systemic ages, with HD 202628 and HD 207

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26

Baumann, Patrick [Verfasser], and Achim [Akademischer Betreuer] Weiss. "The chemical composition of solar-type stars and its impact on the presence of planets / Patrick Baumann. Betreuer: Achim Weiss." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1034813250/34.

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27

Heinze, Aren Nathaniel. "Planets Around Solar-Type Stars: Methods for Detection and Constraints on their Distribution from an L' and M Band Adaptive Optics Survey." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/196022.

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We have attempted adaptive optics (AO) imaging of planets around nearby stars in the L' and M bands, using the Clio instrument on the MMT. The MMT AO system, with its deformable secondary mirror, offers uniquely low background AO-corrected images in these bands. This allowed us to explore a wavelength regime that has not been well utilized in searches for extrasolar planets, but offers some advantages over the more commonly used shorter-wavelength H band regime. We have taken deep L' and M band images of the interesting debris disk stars Vega and ϵ Eri. Our observations of ϵ Eri attain better

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28

Terquem, Caroline. "Déformation des disques circumstellaires par effet de marée : application aux objets stellaires jeunes." Phd thesis, Grenoble 1, 1993. http://tel.archives-ouvertes.fr/tel-00686407.

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Les observations des étoiles de type T Tauri ont mis en évidence le très grand nombre de systèmes binaires parmi cette classe d'objets stellaires jeunes. Cette constatation, associée à celle de l'influence de la déformation des disques circumstellaires sur les distributions spectrales d'énergie des T Tauri, nous a conduit à étudier les effets de marée dans les sytèmes binaires d'étoiles jeunes. Dans un premier temps, nous avons donc calculé la perturbation engendrée par des effets de marée dans un disque circumstellaire, auto-gravitant ou d'accrétion. De façon à obtenir un développement analyt

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29

Tsantaki, Maria. "Precise spectroscopic analysis of solar-type Stars with moderate and fast rotation." Tese, 2015. https://repositorio-aberto.up.pt/handle/10216/78163.

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30

Tsantaki, Maria. "Precise spectroscopic analysis of solar-type Stars with moderate and fast rotation." Doctoral thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/78163.

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31

Pereira, Luís Filipe Regala. "Development of automatic tools for measuring acoustic glitches in seismic data of solar-type stars." Dissertação, 2016. https://repositorio-aberto.up.pt/handle/10216/90991.

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32

Pereira, Luís Filipe Regala. "Development of automatic tools for measuring acoustic glitches in seismic data of solar-type stars." Master's thesis, 2016. https://repositorio-aberto.up.pt/handle/10216/90991.

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33

Marković, Dragoljub. "Black holes in the early universe, in compact binaries, and as energy sources inside solar-type stars." Thesis, 1994. https://thesis.library.caltech.edu/7688/2/markovic%201994.pdf.

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<p>This thesis consists of three separate studies of roles that black holes might play in our universe. </p> <p>In the first part we formulate a statistical method for inferring the cosmological parameters of our universe from LIGO/VIRGO measurements of the gravitational waves produced by coalescing black-hole/neutron-star binaries. This method is based on the cosmological distance-redshift relation, with "luminosity distances" determined directly, and redshifts indirectly, from the gravitational waveforms. Using the current estimates of binary coalescence rates and projected "advance

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34

Meibom, Søren Christian Dalgaard. "An observational exploration of the evolution of angular momentum in close detached binary and singular stars of solar type." 2005. http://catalog.hathitrust.org/api/volumes/oclc/70809820.html.

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35

Stahn, Thorsten. "Analysis of time series of solar-like oscillations - Applications to the Sun and HD52265." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-B52E-5.

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