Academic literature on the topic 'Astronomy and Astrophysics'

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Journal articles on the topic "Astronomy and Astrophysics"

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Longair, Malcolm, and Martin Rees. "Geoffrey Ronald Burbidge. 24 September 1925 — 26 January 2010." Biographical Memoirs of Fellows of the Royal Society 63 (January 2017): 55–78. http://dx.doi.org/10.1098/rsbm.2017.0002.

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Geoffrey (Geoff) Burbidge's career spanned the tumultuous years when astronomy was transformed from a purely optical science to a multi-wavelength discipline through the development of new types of astronomy—radio, X-ray, γ -ray, cosmic ray physics. These offered new astrophysical and cosmological challenges, which he grasped with relish. To all of these disciplines, Geoff, often in collaboration with his wife Margaret Burbidge (FRS 1964), made pioneering contributions, particularly in the areas of the synthesis of the chemical elements, the physics of extragalactic radio sources, the rotation curves of galaxies, the dark matter problem in clusters of galaxies, the physics of accretion discs and the origin of cosmic rays. He also espoused less popular causes such as the non-cosmological nature of the redshifts of quasars and was sceptical about the standard Big Bang picture of the origin of the large-scale structure and dynamics of the Universe. He was a flamboyant and outspoken astrophysicist who challenged his colleagues about their deeply held views on all aspects of astrophysics and cosmology. His service to the community included five years as director of the US Kitt Peak National Observatory, based in Tucson, Arizona, and as a most effective editor of Annual Review of Astronomy and Astrophysics for over 30 years and the Astrophysical Journal.
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Iqbal, M. Sajid. "Gravltational Wave and Astronomy : Probing Physics and Astrophysics." International Journal of Scientific Research 2, no. 1 (June 1, 2012): 121–23. http://dx.doi.org/10.15373/22778179/jan2013/83.

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Lindley, David. "Astronomy versus astrophysics." Nature 354, no. 6348 (November 1991): 20–21. http://dx.doi.org/10.1038/354020a0.

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Jones, Christine, Noah Brosch, Günther Hasinger, Matthew G. Baring, Martin Adrian Barstow, Joao Braga, Evgenij M. Churazov, et al. "DIVISION D COMMISSION 44: SPACE AND HIGH-ENERGY ASTROPHYSICS." Proceedings of the International Astronomical Union 11, T29A (August 2015): 219–44. http://dx.doi.org/10.1017/s1743921316000788.

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Division XI, the predecessor to Division D until 2012, was formed in 1994 at the IAU General Assembly in The Hague by merging Commission 44 Astronomy from Space and Commission 48 High Energy Astrophysics. Historically, space astrophysics started with the high energy wavelengths (far UV, X-ray, and gamma-ray astronomy) which are only accessible from space. However, in modern astronomy, to study high energy astrophysical processes, almost all wavelengths are used (including gamma-ray, X-ray, UV, optical, infrared, submillimeter and radio). In addition other ground-based facilities, including gravitational wave antennas, neutrino detectors and high-energy cosmic ray arrays are joining in this era of multi-messenger astrophysics, as well as space missions with the primary goals to discover and study exoplanets, are under the umbrella of Division XI.
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Sobouti, Y. "Contemporary Astronomy in Iran – A Status Report." Highlights of Astronomy 11, no. 2 (1998): 739–40. http://dx.doi.org/10.1017/s1539299600018657.

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There are of the order of 30 astronomers with research records and another 40-50 with substantial education in astronomy and astrophysics. Geographically, astronomical and astrophysical research is concentrated mainly at Shiraz University (cosmology and photometric observations), Sharif University of Theran (cosmology and gamma-ray astronomy), Tabriz University (binaries and solar physics), Meshad University (binaries and interstellar matter), Zanjan University (stellar dynamics, radio astronomy) and the Institute for Advanced Studies in Basic Sciences, Zanjan (stellar and stellar systems studies).
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Kingston, A. E. "Astronomy and astrophysics abstracts." Planetary and Space Science 34, no. 7 (July 1986): 653. http://dx.doi.org/10.1016/0032-0633(86)90043-7.

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Bell, K. L. "Astronomy and astrophysics abstracts." Planetary and Space Science 37, no. 9 (September 1989): 1155. http://dx.doi.org/10.1016/0032-0633(89)90089-5.

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Bates, D. R. "Astronomy and astrophysics abstracts." Planetary and Space Science 39, no. 6 (June 1991): 951. http://dx.doi.org/10.1016/0032-0633(91)90099-v.

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Canizares, Claude R., and Blair D. Savage. "Space Astronomy and Astrophysics." Physics Today 44, no. 4 (April 1991): 60–67. http://dx.doi.org/10.1063/1.881306.

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Indermuehle, Balthasar T., Michael G. Burton, and Sarah T. Maddison. "History of Astrophysics in Antarctica – A Brief Overview." Highlights of Astronomy 13 (2005): 968. http://dx.doi.org/10.1017/s1539299600017846.

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On examining the historical development of astrophysical science at the bottom of the world from the early 20th century until today we find three temporally overlapping eras of which each has a rather distinct beginning. These are the eras of Astrogeology, High Energy Astrophysics and Photon Astronomy.
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Dissertations / Theses on the topic "Astronomy and Astrophysics"

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Castell, Pedro Ruiz. "Astronomy and astrophysics in Spain (1850-1914)." Thesis, University of Oxford, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432115.

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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.

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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.

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Brazler, Karen Tracy Susan. "TeV astronomy of millisecond pulsars." Thesis, Durham University, 1991. http://etheses.dur.ac.uk/5971/.

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This thesis is concerned with the detection of pulsed TeV γ-rays from millisecond pulsars. These stars appear to include some very efficient producers of high energy particles, but the mechanisms by which they produce TeV γ-rays are still a matter of debate. After an introductory section, there is a brief description of the principles used in the atmospheric Cerenkov technique. The design and operation of the University of Durham atmospheric Cerenkov telescopes are reviewed. The main analysis techniques used to search for periodic signals are then described. The effects on periodic signals of binary motion of a source are discussed. These are a particularly important consideration for observations of millisecond pulsars, where high timing accuracy is required. One of the problems of detecting TeV sources is the cosmic ray background. A means of rejecting background events in TeV γ -ray telescopes is considered in chapter 5. The technique is developed for the Durham Mark III telescope. Substantial rejection of the cosmic ray background is achieved, with minimal loss of source events. The evolutionary scenarios which lead to the formation of millisecond pulsars are outlined. Two models for 7-ray emission are discussed briefly and applied to six known millisecond pulsars. Empirical results on these and two other pulsars are also presented. In particular, a detection of PSR 1855+09 is reported, and an upper limit to the flux from PSR 1957+20 is derived. All the empirical fluxes are compatible with the emission models, but the 'polar gap' model may be favoured. The final chapter summarises the results obtained and suggests some directions for future work on the 7-ray emission from millisecond pulsars.
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Harness, Anthony D. "High Contrast Astronomy with Starshades." Thesis, University of Colorado at Boulder, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10245089.

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One of the most important scientific discoveries to be had this century is the spectroscopic characterization of Earth-like exoplanets to determine the occurrence rate of worlds capable of supporting life and to potentially answer: are we alone in the universe? To accomplish these lofty goals requires an advancement in the technology to separate the overwhelming starlight from that of the exoplanet. I believe starshades are the key technology that will enable these discoveries within our lifetime. This dissertation work is a contribution to the advancement of starshade technology to put us on the path towards discovery.

In this dissertation I present a number of suborbital methods developed for testing small-scale starshades, which include a Vertical Takeoff Vertical Landing rocket, the surface of a dry lake bed, and the heliostat of a solar telescope. The results from our high contrast observations are used to validate the optical model I developed to conduct tolerance analyses that will drive future starshade designs. The results from testing a formation flying sensor on the VTVL rocket demonstrate the rocket’s potential for conducting starshade experiments in the stratosphere.

This dissertation (along with [Novicki, et al. (2016)]) presents the first astronomical observations with a starshade that provide photometric measurements of stars, previously unobserved in the visible spectrum, in the proximity of Vega. These observations led to the development of a visual feedback system for the heliostat that allows us to push farther in separation and inner working angle. These high contrast observations were made using a starshade in the most flight-like configuration (in terms of Fresnel number, inner working angle, and resolution) to date.

The results of this dissertation have helped demonstrate the effectiveness and practicality of starshades for starlight suppression and have outlined a path forward to further advance starshade technology through optical testing and high contrast astronomy.

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Norton, Andrew John. "Galactic X-ray astronomy with EXOSAT." Thesis, University of Leicester, 1988. http://hdl.handle.net/2381/35751.

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The work presented in this thesis covers two topics: a study of Intermediate Polars (non- synchronously rotating magnetic cataclysmic variables) and a survey of the Galactic plane, both carried out with the EXOSAT observatory. The first part of the thesis describes a study of all the Intermediate Polars observed by EXOSAT. The X-ray light curves and spectra of each source are considered, with particular emphasis on the spin modulation. By treating the Intermediate Polars as an homogenous set of objects, a model for the accretion flow and emission region is developed in which the modulation is due to a combination of photo-electric absorption and occultation effects. The modulation seen can be explained in terms of a single, large emission area in the vicinity of the magnetic pole of the white dwarf. Further analysis is presented concerning the differences in the observed properties of GK Per, between outburst and quiescence. The results of these observations are interpretted in terms of a decreasing mass accretion rate and are shown to be in accord with the overall model presented. Finally the concept of the system equilibrium is discussed and used to determine the magnetic moments of the white dwarfs in each system from their spin periods and X-ray luminosities. The values found are shown to be significantly model dependent. The second part of the thesis concerns a survey of the Galactic plane. Scanning observations are used to produce a map of the medium energy X-ray emission and from this a catalogue of 70 sources is compiled. The source list includes many which were previously unidentified. Comments are made on the nature of the sources detected and on the two diffuse components (the Galactic Ridge and the Galactic Bulge) which were observed. Pointed observations were also made at seven of the previously unidentified sources which were detected in the map. These observations are analysed in an attempt to determine the type of object which is producing the emission, and also to gain some insight into possible origins of the two diffuse emission components.
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Birtwell, N. C. "Far infrared astronomy by balloon and satellite." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.354218.

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Murphy, John Anthony. "A heterodyne array receiver for submillimetre wave astronomy." Thesis, University of Cambridge, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373261.

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Carozzi, Tobia. "Radio waves in the ionosphere : Propagation, generation and detection." Doctoral thesis, Uppsala universitet, Institutionen för astronomi och rymdfysik, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1184.

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We discuss various topics concerning the propagation, generation, and detec-tionof high-frequency (HF) radio waves in the Earth's ionosphere. With re-gardsto propagation, we derive a full wave Hamiltonian and a polarization evo-lutionequation for electromagnetic waves in a cold, stratified magnetoplasma.With regards to generation, we will be concerned with three experiments con-ducted at the ionosphere- radio wave interaction research facilities at Sura, Rus-siaand Tromsø, Norway. These facilities operate high power HF transmittersthat can inject large amplitude electromagnetic waves into the ionosphere andexcite numerous nonlinear processes. In an experiment conducted at the Surafacility, we were able to measure the full state of polarization of stimulatedelectromagnetic emissions for the first time. It is expected that by using thetechnique developed in this experiment it will be possible to study nonlinearpolarization effects on powerful HF pump waves in magnetoplasmas in the fu-ture.In another experiment conducted at the Sura facility, the pump frequencywas swept automatically allowing rapid, high-resolution measurements of SEEdependence on pump frequency with minimal variations in ionospheric condi-tions.At the Tromsø facility we discovered by chance a highly variable, pumpinduced, HF emission that most probably emanated from pump excited spo-radicE. Regarding detection, we have proposed a set of Stokes parametersgeneralized to three dimension space; and we have used these parameters in aninvention to detect the incoming direction of electromagnetic waves of multiplefrequencies from a single point measurement.
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Hills, Graeme Lawrence. "The application of polarimetric techniques to gamma ray astronomy." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243187.

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Yearworth, M. "A coded aperture telescope for low energy gamma-ray astronomy." Thesis, University of Southampton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377798.

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Books on the topic "Astronomy and Astrophysics"

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S, Roberts Morton, ed. Astronomy & astrophysics. Washington, D.C: American Association for the Advancement of Science, 1985.

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A, Gregory Stephen, ed. Introductory astronomy & astrophysics. 4th ed. [Fresno, CA]: Thomson Learning, 1998.

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S, Freitag Ruth, and Library of Congress. Science and Technology Division. Reference Section., eds. Astronomy and astrophysics. Washington, D.C: Science Reference Section, Science and Technology Division, Library of Congress, 1991.

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Zeilik, Michael. Introductory astronomy & astrophysics. 4th ed. Fort Worth: Saunders College Pub., 1998.

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Bhattacharya, Asit B. Astronomy and astrophysics. Sudbury, Mass: Jones and Bartlett Publishers, 2010.

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Bhattacharya, Asit B. Astronomy and astrophysics. Hingham, Mass: Infinity Science Press, 2008.

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Böhme, S., U. Esser, H. Hefele, I. Heinrich, W. Hofmann, D. Krahn, V. R. Matas, L. D. Schmadel, and G. Zech, eds. Astronomy and Astrophysics Abstracts. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-12382-9.

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Zeilik, Michael. Introductory astronomy and astrophysics. 3rd ed. Fort Worth: Saunders College Pub., 1992.

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L, Thomas Valerie, and Goddard Space Flight Center, eds. SPAN: astronomy and astrophysics. [Greenbelt, Md.]: National Aeronautics and Space Administration, Goddard Space Flight Center, 1987.

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L, Thomas Valerie, and Goddard Space Flight Center, eds. SPAN: astronomy and astrophysics. [Greenbelt, Md.]: National Aeronautics and Space Administration, Goddard Space Flight Center, 1987.

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Book chapters on the topic "Astronomy and Astrophysics"

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Susalla, Peter J. "Astronomy and Astrophysics." In A Companion to the History of American Science, 33–43. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781119072218.ch3.

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Wielen, Roland. "Theoretical Astrophysics." In Astronomy and Astrophysics Abstracts, 239–329. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-12355-3_9.

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Böhme, S., U. Esser, H. Hefele, I. Heinrich, W. Hofmann, D. Krahn, V. R. Matas, L. D. Schmadel, and G. Zech. "Theoretical Astrophysics." In Astronomy and Astrophysics Abstracts, 237–342. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-12358-4_9.

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Esser, U., H. Hefele, Inge Heinrich, W. Hofmann, D. Krahn, V. R. Matas, Lutz D. Schmadel, and G. Zech. "Theoretical Astrophysics." In Astronomy and Astrophysics Abstracts, 253–367. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-12364-5_9.

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Esser, U., H. Hefele, Inge Heinrich, W. Hofmann, D. Krahn, V. R. Matas, Lutz D. Schmadel, and G. Zech. "Theoretical Astrophysics." In Astronomy and Astrophysics Abstracts, 276–387. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-662-12367-6_9.

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Böhme, S., U. Esser, H. Hefele, I. Heinrich, W. Hofmann, D. Krahn, V. R. Matas, L. D. Schmadel, and G. Zech. "Theoretical Astrophysics." In Astronomy and Astrophysics Abstracts, 264–369. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-662-12382-9_9.

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Burkhardt, G., U. Esser, H. Hefele, I. Heinrich, W. Hofmann, V. R. Matas, L. D. Schmadel, R. Wielen, and G. Zech. "Theoretical Astrophysics." In Astronomy and Astrophysics Abstracts, 270–436. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-51758-7_8.

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Böhme, S., U. Esser, W. Fricke, H. Hefele, I. Heinrich, W. Hofmann, D. Krahn, V. R. Matas, L. D. Schmadel, and G. Zech. "Theoretical Astrophysics." In Astronomy and Astrophysics Abstracts, 233–318. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-11178-9_9.

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Cesarsky, C. J., R. A. Sunyaev, G. W. Clark, R. Giacconi, Qu Win-Yue, E. E. Salpeter, P. A. Scheuer, et al. "High Energy Astrophysics." In Reports on Astronomy, 671–75. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2981-4_37.

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West, Richard M. "High Energy Astrophysics." In Reports on Astronomy, 695. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5392-5_37.

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Conference papers on the topic "Astronomy and Astrophysics"

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Halzen, Francis, John Learned, and Todar Stanev. "Neutrino Astronomy." In Astrophysics in Antarctica. AIP, 1990. http://dx.doi.org/10.1063/1.39028.

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Harper, D. A. "Infrared astronomy in Antarctica." In Astrophysics in Antarctica. AIP, 1990. http://dx.doi.org/10.1063/1.39022.

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Vacanti, G. "Gamma-ray astronomy at 1 TeV." In Particle astrophysics. AIP, 1990. http://dx.doi.org/10.1063/1.39151.

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Kokhirova, G., P. Levkina, N. Bakhtigaraev, and U. Khamroev. "Facilities of astrophysical telescopes in space debris research." In ASTRONOMY AT THE EPOCH OF MULTIMESSENGER STUDIES. Proceedings of the VAK-2021 conference, Aug 23–28, 2021. Crossref, 2022. http://dx.doi.org/10.51194/vak2021.2022.1.1.025.

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The possibilities of astrophysical telescopes for space debris research are shown. Some results of observations of space debris’fragments using the Zeiss–2000 telescope (D = 2 m, F = 16 m) Terskol branch of the Institute of Astronomy of the RussianAcademy of Sciences and Zeiss–1000 (D = 1 m, F = 13 m) of the Sanglokh observatory of the Institute of Astrophysics ofthe National academy of Sciences of Tajikistan are presented.
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Smith, A. J. "Astrophysics with Milagro." In HIGH ENERGY GAMMA-RAY ASTRONOMY: 2nd International Symposium on High Energy Gamma-Ray Astronomy. AIP, 2005. http://dx.doi.org/10.1063/1.1878479.

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Hogan, Craig J. "Brane-world astronomy." In RELATIVISTIC ASTROPHYSICS: 20th Texas Symposium. AIP, 2001. http://dx.doi.org/10.1063/1.1419526.

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Cherry, Michael L. "Neutrino astronomy on the moon—practical considerations." In Particle astrophysics. AIP, 1990. http://dx.doi.org/10.1063/1.39130.

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Weeks, Trevor C. "Very high energy gamma ray astronomy." In Astrophysics in Antarctica. AIP, 1990. http://dx.doi.org/10.1063/1.38992.

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Harvey, J. "Solar-stellar astronomy working group summary." In Astrophysics in Antarctica. AIP, 1990. http://dx.doi.org/10.1063/1.39019.

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Kaplan, Mike. "NASA's Future Plans for Space Astronomy and Astrophysics." In Space Optics for Astrophysics and Earth and Planetary Remote Sensing. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/soa.1991.tua1.

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This paper presents NASA's plans for future space astronomy and astrophysics through the first decade of the next century. We will discuss specific missions and mission concepts, as well as plans to develop optics and sensors technology to enable these missions.
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Reports on the topic "Astronomy and Astrophysics"

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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.

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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.
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Cortés Rodríguez, Patricio, Denise Depoortere, and Lucy Opazo Calfin. Conjunto de datos: Datasets indexed in Data Citation Index in the Astronomy and Astrophysics category, 2010-2019. Pontificia Universidad Católica de Chile, 2021. http://dx.doi.org/10.7764/datasetuc/62181.

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Wefel, J. P., and T. G. Guzik. Nuclear interactions in high energy heavy ions and applications in astrophysics. [Dept. of Physics and Astronomy, Louisiana State Univ. , Baton Rouge]. Office of Scientific and Technical Information (OSTI), January 1993. http://dx.doi.org/10.2172/6703061.

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Weekes, T. C. The application of two-dimensional imaging to very high energy gamma ray astronomy. [Smithsonian Institution Astrophysical Observatory, Cambridge, Massachusetts]. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/6874099.

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