Angular Momentum And Mass Loss For Hot Stars
Download Angular Momentum And Mass Loss For Hot Stars full books in PDF, epub, and Kindle. Read online free Angular Momentum And Mass Loss For Hot Stars ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Angular Momentum and Mass Loss for Hot Stars
Author | : L.A. Willson,R. Stalio |
Publsiher | : Springer Science & Business Media |
Total Pages | : 366 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9789400921054 |
Download Angular Momentum and Mass Loss for Hot Stars Book in PDF, Epub and Kindle
Fundamental unsolved problems of stellar astrophysics include the effects of angular momentum on stellar structure and evolution, the nature and efficiency of the processes by which angular momentum is redistributed within and lost from stars, and the role that stellar rotation plays in enhancing or driving stellar mass loss. There appears to be a qualitative change in the nature and efficiency of these mechanisms near spectral type FO: hotter (more massive) stars typically retain more angular momentum at least until they reach the main sequence, while cooler stars typically spin down quickly. For the hotter stars, recent work suggests a strong link between the type of pulsation behavior, the mass loss rates, and the rotation velocity. If the same mechanisms are able to drive mass loss from the main sequence A stars, as has recently been proposed, then the current interpretations of a number of observations will be drastically affected: e. g. the ages of clusters may be incorrect by up to a factor of two, and the surface abundances of isotopes of He, Li and Be may no longer give constraints on cosmological nucleosynthesis. There are also effects on the evolution of the abundances of elements in the interstellar medium and on the general evolution of populations of stars. Thus the questions of the mechanisms of angular momentum and mass loss of stars more massive than the sun is important not only for stellar studies but for the foundations of much of modern astrophysics.
Pulsation and Mass Loss in Stars
Author | : R. Stalio,L.A. Willson |
Publsiher | : Springer Science & Business Media |
Total Pages | : 332 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9789400930292 |
Download Pulsation and Mass Loss in Stars Book in PDF, Epub and Kindle
Stellar mass loss is an essential part of the cycling of material from the interstellar medium into stars and back, and must be understood if we are to model processes on galactic to cosmological scales. The study of stellar winds and the effects of stellar mass loss has reached a particularly exciting stage where observational capabilities are increasingly able to provide interesting constraints on models and theories. Recent resu1ts from theoretical and observational work for both hot and cool stars with substantial winds have led to the suggestion that a combination of pulsation with other mechanisms makes for particularly efficient mass loss from stars. This provided the original motivation for the organization of this workshop. The conference was organized along relatively conventional lines according to the types of objects being scrutinized. However the true unity of the proceedings comes from the interplay of the mechanisms involved. For example, for the cool, luminous Mira variables, pulsation leads to shock waves that extend the atmosphere, enhancing dust formation; radiation pressure on dust drives the wind, cooling the atmosphere and in some cases suppressing the shocks. Similarly for the Be stars, both pulsation (in this case, non-radial) and radiation pressure (due to UV resonance lines) are expected to be important, and this expectation is at least qualitatively borne out by the observations.
The Origin of Nonradiative Heating momentum in Hot Stars
Author | : Anne Barbara Underhill,A. G. Michalitsianos |
Publsiher | : Unknown |
Total Pages | : 268 |
Release | : 1985 |
Genre | : Early stars |
ISBN | : UCAL:C3181632 |
Download The Origin of Nonradiative Heating momentum in Hot Stars Book in PDF, Epub and Kindle
Pulsation Rotation and Mass Loss in Early Type Stars
Author | : Luis A. Balona,Huib F. Henrichs,Jean Michel Le Contel |
Publsiher | : Springer Science & Business Media |
Total Pages | : 554 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9789401110303 |
Download Pulsation Rotation and Mass Loss in Early Type Stars Book in PDF, Epub and Kindle
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.
Clumping in Hot star Winds
Author | : Wolf-Rainer Hamann,Achim Feldmeier,Lidia M. Oskinova |
Publsiher | : Universitätsverlag Potsdam |
Total Pages | : 262 |
Release | : 2008 |
Genre | : Stellar winds |
ISBN | : 9783940793331 |
Download Clumping in Hot star Winds Book in PDF, Epub and Kindle
Reports on Astronomy
Author | : Derek McNally |
Publsiher | : Springer Science & Business Media |
Total Pages | : 616 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 9789401133647 |
Download Reports on Astronomy Book in PDF, Epub and Kindle
IAU Transactions are published as a volume corresponding to each General Assembly. Volume A is produced prior to the Assembly and contains Reports on Astronomy, prepared by each Commission President. The intention is to summarize the astronomical results that have affected the work of the Commission since the production of the previous Reports up to a time which is about one year prior to the General Assembly. Volume B is produced after the Assembly and contains accounts of Commission Meetings which were held, together with other material. The reports included in the present volume range from outline summaries to lengthy compilations and references.
Old Stellar Populations
Author | : Santi Cassisi,Maurizio Salaris |
Publsiher | : John Wiley & Sons |
Total Pages | : 506 |
Release | : 2013-08-29 |
Genre | : Science |
ISBN | : 9783527665549 |
Download Old Stellar Populations Book in PDF, Epub and Kindle
The book discusses the theoretical path to decoding the information gathered from observations of old stellar systems. It focuses on old stellar systems because these are the fossil record of galaxy formation and provide invaluable information ont he evolution of cosmic structures and the universe as a whole. The aim is to present results obtained in the past few years for theoretical developments in low mass star research and in advances in our knowledge of the evolution of old stellar systems. A particularly representative case is the recent discovery of multiple stellar populations in galactic globular clusters that represents one of the hottest topics in stellar and galactic astrophysics and is discussed in detail. Santi Cassisi has authored about 270 scientific papers, 150 of them in peer-reviewed journals, and the title Evolution of Stars and Stellar Populations.
Cosmic Magnetic Fields IAU S259
Author | : International Astronomical Union. Symposium |
Publsiher | : Cambridge University Press |
Total Pages | : 716 |
Release | : 2009-06-11 |
Genre | : Science |
ISBN | : 0521889901 |
Download Cosmic Magnetic Fields IAU S259 Book in PDF, Epub and Kindle
IAU Symposium 259 presents the first interdisciplinary, comprehensive review of the role of cosmic magnetic fields, involving astronomers and physicists from across the community. Offering both theoretical and observational topics ranging from Earth's habitability to the origin of the universe, this is an invaluable summary for researchers and graduate students.