Livros e Apostilas de Astronomia
Estrelas Variáveis
John R. Percy, "Understanding Variable Stars"
Cambridge University Press | 2007-06-11 | ISBN: 0521232538 | 372 pages | PDF | 7,2 MB
Variable stars are those that change brightness. They come in many varieties, but each one provides important information about the star: its properties, its internal structure, and its evolution.
This book provides a concise overview of variable stars, including a historical perspective, an introduction to stars in general, the techniques for discovering and studying variable stars, and a description of the main types of variable stars. Intended for anyone with some background knowledge of astronomy, it is especially suitable for undergraduate students and experienced amateur astronomers.
This book provides a concise overview of variable stars, including a historical perspective, an introduction to stars in general, the techniques for discovering and studying variable stars, and a description of the main types of variable stars. Intended for anyone with some background knowledge of astronomy, it is especially suitable for undergraduate students and experienced amateur astronomers.
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David H. Levy, "David Levy's Guide to Variable Stars"
Cambridge University Press | 2006 | ISBN: 0521608600 | 276 pages | PDF | 4,3 MB
Found throughout the universe, variable stars are fascinating objects to observe. Their brightness changes over time and they can easily be seen with even the most basic equipment. David Levy explains how to begin electronic (or CCD) observing, as well as how to observe variable stars through a small telescope or binoculars. Featuring a section on Southern hemisphere stars, this book covers various types of objects that can be observed by amateur astronomers, including more exotic phenomena like gamma ray bursts, blazars, and polars. It will motivate anyone with even a basic interest in astronomy to begin observing variable stars.
David H. Levy is one of the most successful comet hunters in history. He has discovered twenty-one, eight of them using a telescope in his own backyard. With Eugene and Carolyn Shoemaker at the Palomar Observatory in California, Levy discovered Shoemaker-Levy 9, the comet that collided with Jupiter in 1994, and is currently involved with the Jarnac Comet Survey, based at the Jarnac Observatory in Vail, Arizona.
In addition to being the author or editor of 31 books and other products, David Levy is the Science Editor for Parade magazine and contributing editor for Sky and Telescope magazine and the Canadian periodical, SkyNews.
David H. Levy is one of the most successful comet hunters in history. He has discovered twenty-one, eight of them using a telescope in his own backyard. With Eugene and Carolyn Shoemaker at the Palomar Observatory in California, Levy discovered Shoemaker-Levy 9, the comet that collided with Jupiter in 1994, and is currently involved with the Jarnac Comet Survey, based at the Jarnac Observatory in Vail, Arizona.
In addition to being the author or editor of 31 books and other products, David Levy is the Science Editor for Parade magazine and contributing editor for Sky and Telescope magazine and the Canadian periodical, SkyNews.
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Variable and Non-Spherical Stellar Winds
Springer-Verlag Telos | 1999-05-15 | ISBN: 3540657029 | 424 pages | DjVu | 3,5 MB
There is abundant evidence that essentially all luminous hot-star winds contain time-dependent and anisotropic structures. IAU Colloquium 169 was convened to review the observations of variability and asphericity, to discuss the physical processes that might cause such behavior and to look for evolutionary consequences.
The topics included OBA stars, Be stars, Wolf-Rayet stars, Be stars, and luminous blue variables (LBVs). The role played by rotation in shaping the stellar wind was a recurrent theme. Photospheric pulsations and/or magnetic fields are particularly appealing mechanisms for triggering the formation of recurrent wind structures.
The topics included OBA stars, Be stars, Wolf-Rayet stars, Be stars, and luminous blue variables (LBVs). The role played by rotation in shaping the stellar wind was a recurrent theme. Photospheric pulsations and/or magnetic fields are particularly appealing mechanisms for triggering the formation of recurrent wind structures.
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Observing Variable Stars: A Guide for the Beginner
Cambridge University Press | Pages: 224 | 1989-05-26 | ISBN 0521321131 | DJVU | 1.3 MB
Variable star astronomy is one field which still allows amateur astronomers to make significant contributions to the advancement of science. Everyone can play a part in variable star observations, using a small telescope, binoculars, or even the naked eye. Written by an award-winning astronomer, Observing Variable Stars provides a comprehensive introduction to the field of variable star observation for the amateur.
The book begins with advice on binoculars and telescopes, and on how and when to observe stars effectively. Levy then explains the ways in which to interpret variation in light output in terms of the life of a star, from birth to sometimes violent death. All the major variables are described and classified, as well as other variable objects such as active galaxies, asteroids, comets, and the sun.
The book also illustrates how astrophysicists interpret variations in light output in terms of the evolution of stars. Observing Variable Stars contains a seasonal guide to the night sky usable in all latitudes. Throughout, practical observations serve to complement the text, making this an enjoyable, readable introduction to an exciting area of astronomy.
The book begins with advice on binoculars and telescopes, and on how and when to observe stars effectively. Levy then explains the ways in which to interpret variation in light output in terms of the life of a star, from birth to sometimes violent death. All the major variables are described and classified, as well as other variable objects such as active galaxies, asteroids, comets, and the sun.
The book also illustrates how astrophysicists interpret variations in light output in terms of the evolution of stars. Observing Variable Stars contains a seasonal guide to the night sky usable in all latitudes. Throughout, practical observations serve to complement the text, making this an enjoyable, readable introduction to an exciting area of astronomy.
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Light Curves of Variable Stars: A Pictorial Atlas
Cambridge University Press | 1996-10-28 | ISBN: 0521390168 | 249 pages | PDF | 7 MB
This unique volume provides a complete reference on variable stars. It presents a wealth of typical light- and color-curves to allow identification, together with a detailed and up-to-date description of each subclass.
The editors, together with seven other world experts, have created a unique pictorial atlas of variable stars. In the first chapter they give a clear introduction to the nomenclature and classification of the light curves of variable stars, and to photometric systems. In the remaining chapters they provide a detailed account of each subclass: from eruptive, pulsating, rotating and cataclysmic variables, to eclipsing-binary systems and X-ray binaries. Readers can quickly and easily locate specific variable stars, types and classes of variables, and key astrophysical terms in the book by means of detailed object-name and subject indexes.
This comprehensive and up-to-date volume provides an essential reference for all those interested in variable stars--from researchers and graduate students to dedicated
The editors, together with seven other world experts, have created a unique pictorial atlas of variable stars. In the first chapter they give a clear introduction to the nomenclature and classification of the light curves of variable stars, and to photometric systems. In the remaining chapters they provide a detailed account of each subclass: from eruptive, pulsating, rotating and cataclysmic variables, to eclipsing-binary systems and X-ray binaries. Readers can quickly and easily locate specific variable stars, types and classes of variables, and key astrophysical terms in the book by means of detailed object-name and subject indexes.
This comprehensive and up-to-date volume provides an essential reference for all those interested in variable stars--from researchers and graduate students to dedicated
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Brian Warner Cataclysmic Variable Stars
Cambridge University Press | 2003 | ISBN: 052154209X | 596 pages | PDF | 5,8 MB
The study of cataclysmic variables - interacting binary stars containing a white dwarf accreting from an orbiting companion - is undergoing an exciting renaissance, as it embraces observations at all wavelengths. Cataclysmic variables allow, in particular, the direct and detailed study of equilibrium and non-equilibrium accretion discs; in turn these developments also help in our understanding of X-ray binaries, black holes and active galactic nuclei. This timely volume provides the first comprehensive survey of cataclysmic variable stars, integrating theory and observation into a single, synthesised text. An introductory chapter gives the historical background of studies of cataclysmic variables.
The author then goes on to give an up-to-date review of both the observations (at all wavelengths, and over all time-scales), the theories, the models of the structures and accretion processes believed to be involved. A very detailed bibliography is also provided to guide the reader to pertinent primary literature.
The author then goes on to give an up-to-date review of both the observations (at all wavelengths, and over all time-scales), the theories, the models of the structures and accretion processes believed to be involved. A very detailed bibliography is also provided to guide the reader to pertinent primary literature.
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