Mass Loss On The Agb And Its Consequences For Stellar Evolution

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Mass Loss On The Agb And Its Consequences For Stellar Evolution

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Author : Astrophysikalisches Institut Potsdam
language : en
Publisher:
Release Date : 1994

Mass Loss On The Agb And Its Consequences For Stellar Evolution written by Astrophysikalisches Institut Potsdam and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Stellar Evolution Of Low And Intermediate Mass Stars

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Author :
language : de
Publisher:
Release Date : 1994

Stellar Evolution Of Low And Intermediate Mass Stars written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

Effects Of Mass Loss On Stellar Evolution

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Author : C. Chiosi
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06

Effects Of Mass Loss On Stellar Evolution written by C. Chiosi 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 IAU Colloquium No. 59, "The effects of mass loss on Stellar Evolution" was held on September 15-19, 1980 at the International Centre for Theoretical Physics, Miramare, Trieste (Italy), under the auspices of the IAU Executive Co~ mittee and the Italian National Council of Research. The planning of this conference began two years ago du ring the IAU Symposium No. 83 "Mass loss and evolution of 0 type stars" (Qualicum Beach, Victoria, Canada) when we felt that mass loss and its effects on the evolution of stars was too broad a subject for being confined to 0 type stars only. Therefore we thought that a conference dealing with the general problem of mass loss across the whole HR diagram would have been of interest to all people working in the field. The main idea was that bringing together Astronomers and Astrophysicists of the widest range of interests and e~ pertize - all in some way related to the problem of mass loss from stars - would have spurred thorough discussions on the many aspects and implications of this topic. We hope this goal has been achieved. Furthermore, the most recent observational and theoreti cal developments on the problem of mass loss from early ty pe stars avoided this meeting to be a simple updating of the Qualicum Beach Symposium as far as this issue is concerned.

Extremely Extended Dust Shells Around Evolved Intermediate Mass Stars

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Author : Basil Menzi Mchunu
language : en
Publisher:
Release Date : 2011

Extremely Extended Dust Shells Around Evolved Intermediate Mass Stars written by Basil Menzi Mchunu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Electronic Dissertations categories.

Intermediate mass stars ( %0 .8 - 8 solar masses), at the asymptotic giant branch phase (AGB) suffer intensive mass loss, which leads to the formation of a circumstellar shell (s) of gas and dust in their circumstellar envelope. At the end of the AGB phase, the mass-loss decreases or stops and the circumstellar envelope begins to drift away from the star. If the velocity of the AGB phase wind has been relatively constant, then dust or molecular emission furthest from the star represents the oldest mass loss, while material closer to the star represents more recent mass loss. Therefore, the history of mass loss during the AGB phase is imprinted on the dust shells of the post-AGB envelope. Thus, by studying the distribution of material in the form of dust emission in the circumstellar shells of late evolved stars (i.e. the post AGB phases are pre - planetary nebula (PPN) and the planetary nebula (PN)) we can gain a better understanding of the mass-loss processes involved in the evolution of intermediate mass stars. I studied two groups of intermediate mass stars, namely six oxygen rich and six carbon rich candidates. In this thesis a study of evolution of intermediate mass stars is confronted by means of observations, in which far - infrared (FIR) images, are used to study the physical properties and the material distribution of dust shells of AGB and post AGB circumstellar envelope. Infrared radiation from thermal dust emission can be used to probe the entire dust shell because, near to mid-infrared radiation arises solely from the hottest regions close to the star; while the outer regions away from the star are cool such that they emit at longer infrared wavelengths. Essentially, radiation in the FIR to sub-millimeter wavelengths is emitted by the entire dust shell and hence can be used to probe the entire dusty envelope. Therefore far-infrared emission by late evolved stars can be used to probe the large scale - structure of AGB and post - AGB circumstellar shells.Our results from space observations indicated the following: The sizes of the circumstellar dust shell observed in oxygen rich stars are within %1 pc. We derived the dust masses derived from far infrared ISO PHT 32 observation of oxygen rich stars that are between 1.7 -- 4 x 10-4 solar masses. These results provides us with a lower limit in the progenitor masses of stars estimated to be within 0.56 -- 0.76 solar masses. These results indicate that the initial main sequence masses fro oxygen rich stars are within 1 - 3.5 solar masses. The time scales derived since the oldest mass was ejected during the evolution of oxygen rich stars are 4 - 13 x 104 years. For the carbon rich stars: The size of the circumstellar dust shells are within 1 - 1.6 pc. The masses of dust in the shells are a approximated to be within 0.1 - 1.44 x 10-4 solar masses. A lower limit to the progenitor masses of carbon rich stars that are between 0.61 - 0.9 solar mass, suggesting that these stars evolved from the main sequence masses between 2. - 6 solar masses.

Stars Stellar Evolution

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Author : Klaas de Boer
language : fr
Publisher: EDP Sciences
Release Date : 2012-12-17T00:00:00+01:00

Stars Stellar Evolution written by Klaas de Boer and has been published by EDP Sciences this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-17T00:00:00+01:00 with Science categories.

The diverse forms that stars assume in the course of their lives can all be derived from the initial conditions : the mass and the original chemical composition. In this textbook Stars and Stellar Evolution the basic concepts of stellar structure and the main roads of stellar evolution are described. First, the observable parameters are presented, which are based on the radiation emerging from a stellar atmosphere. Then the basic physics is described, such as the physics of gases, radiation transport, and nuclear processes, followed by essential aspects of modelling the structure of stars. After a chapter on star formation, the various steps in the evolution of stars are presented. This leads us to brown dwarfs, to the way a star changes into the red-giant state and numerous other stages of evolution and ultimately to the stellar ashes such as white dwarfs, supernovae and neutron stars. Stellar winds, stellar rotation and convection all influence the way a star evolves. The evolution of binary stars is included by using several canonical examples in which interactive processes lead to X-ray binaries and supernovae of type Ia. Finally, the consequences of the study of stellar evolution are tied to observed mass and luminosity functions and to the overall evolution of matter in the universe. The authors aim at reaching an understanding of stars and their evolution by both graduate students and astronomers who are not themselves investigating stars. To that end, numerous graphs and sketches, among which the Hertzsprung-Russell diagram is the dominant one, help trace the ways of stellar evolution. Ample references to specialised review articles as well as to relevant research papers are included.

Asymptotic Giant Branch Stars

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Author : Harm J. Habing
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-04-17

Asymptotic Giant Branch Stars written by Harm J. Habing 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 2013-04-17 with Science categories.

The underlying astrophysical mechanisms of the objects known as asymptotic giant branch stars - the structures that occur during the dramatic period prior to a star's death - is the main theme of this text. Over the past three decades, asymptotic giant branch stars have become a topic of their own, and the contributions to this volume all focus on these entities themselves, rather than their connections to other fields of astronomy. Among the many topics covered are new methods of high- quality infrared observation and the more detailed and realistic simulations made possible by increasingly fast computers. This collection should be useful to graduate students who work in the field, teachers who want to address the subject in their courses, and to astronomers from various backgrounds who are interested in the astrophysics of AGB stars.

Stellar Evolution Of Low And Intermediate Mass Stars

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Author :
language : de
Publisher:
Release Date : 1997

Stellar Evolution Of Low And Intermediate Mass Stars written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.

Stellar Evolution With Mass Loss

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Author : Frederick David Alfred Hartwick
language : en
Publisher:
Release Date : 1966

Stellar Evolution With Mass Loss written by Frederick David Alfred Hartwick and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with Stars categories.

Understanding Stellar Evolution

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Author : Henny J. G. L. M. Lamers
language : en
Publisher: CRC Press
Release Date : 2018-02-28

Understanding Stellar Evolution written by Henny J. G. L. M. Lamers and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-28 with Stars categories.

'Understanding Stellar Evolution' is based on a series of graduate-level courses taught at the University of Washington since 2004, and is written for physics and astronomy students and for anyone with a physics background who is interested in stars. It describes the structure and evolution of stars, with emphasis on the basic physical principles and the interplay between the different processes inside stars such as nuclear reactions, energy transport, chemical mixing, pulsation, mass loss, and rotation. Based on these principles, the evolution of low- and high-mass stars is explained from their formation to their death. In addition to homework exercises for each chapter, the text contains a large number of questions that are meant to stimulate the understanding of the physical principles. An extensive set of accompanying lecture slides is available for teachers in both Keynote(R) and PowerPoint(R) formats.

Circumstellar Media In Late Stages Of Stellar Evolution

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Author : Robin E. S. Clegg
language : en
Publisher: Cambridge University Press
Release Date : 1994-08-25

Circumstellar Media In Late Stages Of Stellar Evolution written by Robin E. S. Clegg and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-08-25 with Science categories.

In the last throes of their lives, how do low- and high-mass stars interact with their immediate surroundings? How does the circumstellar medium affect the shape of a nebula? How are supernovae effected by a dense medium? And what do we understand of how stellar winds interact with their environments? These and many other exciting issues are addressed in these proceedings, from the 34th Herstmonceux conference, held in Cambridge. Highlights of developments in the field covered in this volume include the latest observational results that show how various types of stellar ejecta differ in shape, and a unified view of the physical processes involved; as well as the latest results on the media around supernovae 1987A and 1993J. This timely volume provides review articles that serve both as an excellent introduction for graduate students, and a handy reference for researchers; and up-to-date research papers for those who want to keep abreast of developments in the field.