The Early Type Stars
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The Early Type Stars
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Author : A.B. Underhill
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
The Early Type Stars written by A.B. Underhill and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
At this time when astronomers are being surprised by the discovery of objects which emit a fabulously large amount of energy, that is the quasi-stellar radio sources and the quasi-stellar galaxies, and when by the means of space vehicles X rays, gamma rays and cosmic rays are being observed to come from the depths of interstellar space, one may ask why write a book about stars. Stars seem to be almost incidental when one looks at the universe in terms of exceedingly great energies. Nevertheless, stars exist. They are accessible to study and they have not yet revealed all their secrets. This is enough to arouse interest and to cause one to try to find answers to the questions which arise. The early type stars are particularly interesting because they are spendthrift stars pouring out their energy at a great rate. But their brilliance is also their undoing. They must evolve rather quickly, on an astrophysical scale. Thus by studying these stars we are studying a population in change. The implications from the local and from the cosmological viewpoint are important if one wishes to understand the details of stellar evolution and of galactic structure. Perhaps one of the simplest reasons for writing a book about the early type stars is to see if some of the conundrums pre sented by the spectra of these stars can be unravelled when all the available infor mation is brought together.
Pulsation Rotation And Mass Loss In Early Type Stars
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Author : Luis A. Balona
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Pulsation Rotation And Mass Loss In Early Type Stars written by Luis A. Balona and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
In this Symposium, researchers specializing in pulsation, rotation, magnetic fields and stellar winds are brought together for the first time in order to broaden our understanding of O and B stars. Thanks to advances in digital spectroscopy, new types of pulsating B stars have been discovered. The pulsations can be understood in terms of the recent revision of metal opacities, but the effects of rapid rotation and magnetic fields need further study. Observations in the UV and X-ray regions demonstrate that many B and Be stars show other activity, besides pulsation which is not yet understood. The reason for the enhanced mass loss in Be stars is a question which dominates the Symposium and which remains unanswered, although it is surely to be found in activity at or near the photosphere coupled with rotation. It is shown that the geometry of the circumstellar envelopes around Be stars is indeed a flattened disk as they can now be optically resolved. The variability of radiatively-driven winds from O and B stars are likely related to the rotation of the star. This underlines the central theme of the book: that the various phenomena seen in these stars cannot be studied in isolation.
Instabilities In Luminous Early Type Stars
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Author : Henny J.G.L.M. Lamers
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Instabilities In Luminous Early Type Stars written by Henny J.G.L.M. Lamers and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
On April 28 1986 Cornelis de Jager reached the age of 65 years. On April 30 he officially retired from the University of Utrecht where he has held a Chair for Stellar Astrophysics, later changed into Space Physics, since 1958. Cees de Jager, as he prefers to be called by his friends, has had an active and successful life in science. His interest in astronomy was raised by his father under the clear skies of Celebes (Indonesia). He started a study in physics and astronomy as a student of the late M. Minnaert in Utrecht during World War II. When in 1943 the occupying forces recruited students who did not want to sign the declaration of loyalty for their war-efforts, Cees and three fellow students went into hiding at the Observatory in Utrecht. During this very "quiet" period van de Hulst developed the theory of the 21 em radiation of neutral hydrogen and de Jager started the observations of variable stars in the pitch dark nights of a country at war. The study of Beta Cepheids rapid ly awoke his interest which was kept throughout the years. In 1958 he organized an international campaign to observe 12 Lac spectroscopically and photometrically, which was a great success.
Spectral Classification Of Early Type Stars On The D A O Photometric System
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Author : National Research Council of Canada. Astrophysics Branch
language : en
Publisher:
Release Date :
Spectral Classification Of Early Type Stars On The D A O Photometric System written by National Research Council of Canada. Astrophysics Branch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Blanketed Model Atmospheres For Early Type Stars
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Author : Robert L. Kurucz
language : en
Publisher:
Release Date : 1974
Blanketed Model Atmospheres For Early Type Stars written by Robert L. Kurucz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Early stars categories.
Spectrophotometric Parameters Of Early Type Stars
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Author : Gutiérrez Alonso Gutiérrez A.
language : en
Publisher:
Release Date : 1968
Spectrophotometric Parameters Of Early Type Stars written by Gutiérrez Alonso Gutiérrez A. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Astronomical photometry categories.
Literature 1976 Part 2
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Author : S. Böhme
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-18
Literature 1976 Part 2 written by S. Böhme and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-18 with Science categories.
Astronomy and Astrophysics Abstracts, which has appeared in semi-annual volumes since 1969, is de voted to the recording, summarizing and indexing of astronomical publications throughout the world. It is prepared under the auspices of the International Astronomical Union (according to a resolution adopted at the 14th General Assembly in 1970). Astronomy and Astrophysics Abstracts aims to present a comprehensive documentation of literature in all fields of astronomy and astrophysics. Every effort will be made to ensure that the average time interval between the date of receipt of the original literature and publication of the abstracts will not exceed eight months. This time interval is near to that achieved by monthly abstracting journals, com pared to which our system of accumulating abstracts for about six months offers the advantage of greater convenience for the user. Volume 18 contains literature published in 1976 and received before March 1, 1977; some older liter ature which was received late and which is not recorded in earlier volumes is also included.
Mass Loss And Evolution Of O Type Stars
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Author : P.S. Conti
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Mass Loss And Evolution Of O Type Stars written by P.S. Conti and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
The organization of this Symposium had its beginnings at the International Astronomical Union General Assembly in Grenoble in 1976. The initial "rounding up" of the Scienti fic Organizing Committee was begun by Drs. Snow and Swings; most of us who became the eventual organizing committee met a few times during the Assembly and formulated the essential outlines of the meeting. Extensive correspondence with all the committee subsequently established the program. The idea was to bring together both observers and theoreticians to discuss the stellar winds and mass loss rates and their effects on evolutions of O-type stars. On the observational side, there are now spectroscopic data from the far UV to the near IR regions concerning the stellar winds. There is also information about the free-free emission in the wind from the IR and radio portions of the spectrum. Fortunately, these different detection methods give more or less the same mass loss rate for the one star, s Pup" which has been observed at all wavelengths. One of the intents of the first three sessions of this Symposium is to outline the eXisting data on mass loss rates as it per tains to the O-type stars.
Star Formation In Early Type Galaxies
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Author : Jordi Cepa
language : en
Publisher:
Release Date : 1999
Star Formation In Early Type Galaxies written by Jordi Cepa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Science categories.
Instabilities In Luminous Early Type Stars
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Author : Henny J.G.L.M. Lamers
language : en
Publisher: Springer
Release Date : 2011-10-12
Instabilities In Luminous Early Type Stars written by Henny J.G.L.M. Lamers and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-10-12 with Science categories.
On April 28 1986 Cornelis de Jager reached the age of 65 years. On April 30 he officially retired from the University of Utrecht where he has held a Chair for Stellar Astrophysics, later changed into Space Physics, since 1958. Cees de Jager, as he prefers to be called by his friends, has had an active and successful life in science. His interest in astronomy was raised by his father under the clear skies of Celebes (Indonesia). He started a study in physics and astronomy as a student of the late M. Minnaert in Utrecht during World War II. When in 1943 the occupying forces recruited students who did not want to sign the declaration of loyalty for their war-efforts, Cees and three fellow students went into hiding at the Observatory in Utrecht. During this very "quiet" period van de Hulst developed the theory of the 21 em radiation of neutral hydrogen and de Jager started the observations of variable stars in the pitch dark nights of a country at war. The study of Beta Cepheids rapid ly awoke his interest which was kept throughout the years. In 1958 he organized an international campaign to observe 12 Lac spectroscopically and photometrically, which was a great success.