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Author: P. DELACHE (Ed)
Publisher: Atlantica Séguier Frontières
ISBN: 9782863320617
Category : Astrophysics
Languages : en
Pages : 364
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Book Description
Author: P. DELACHE (Ed)
Publisher: Atlantica Séguier Frontières
ISBN: 9782863320617
Category : Astrophysics
Languages : en
Pages : 364
Get Book Here
Book Description
Author: Institut d'astrophysique (Paris, France)
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: International Astronomical Union. Symposium
Publisher: Cambridge University Press
ISBN: 9780521889834
Category : Science
Languages : en
Pages : 506
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Book Description
Stellar models are the very basic building blocks with which we build up our knowledge of the Universe. New numerical experiments are heralding a new level of sophistication in our ability to model, and understand, how stars work. This volume provides an overview and the most recent advances in modeling of stellar structure and evolution. Modeling of stars relies on our understanding of the detailed physical processes happening in stars, and the most recent observations of stars made by modern large telescopes and current high technologies. IAU Symposium 252 presents the most recent developments in five key areas, including: improvements of the physical ingredients of stellar models; the evolution of low and intermediate mass stars; the evolution of massive stars; close binary evolution; and stellar physics in the era of very large telescopes. This overview of stellar research is at a level suitable for research astronomers and graduate students.
Author: Lynn Buchele
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 64
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Book Description
Accurate stellar modeling requires using our understanding of phenomena far smaller than humans can observe to study some of the largest objects in the universe. One quantity that bridges this gap is the mean opacity, which uses knowledge about atomic and molecular interactions with light to inform how photons carry energy through a star. As the mean opacity depends on both the quantum mechanics of atoms and molecules and the macroscopic properties of the star (temperature, density, composition) it can be tricky to calculate. Traditionally, stellar modeling programs avoid the time-consuming computation of opacity by interpolating off of pre-made opacity tables. However, this interpolation introduces the possibility of error. In low-temperature areas of a star (less than 10,000K), this error is likely to be largest when the composition of the star differs from the composition used to create the tables. One way to examine this error is to model stars using low-temperature opacity values calculated on-the-fly. In this case, on-the-fly means using opacity calculated as the star is being modeled by a low-temperature opacity code using the exact temperature, density, and composition of each region within the star. This work describes the process of adapting the Atlas Opacity Program (ATOP) for use as an on-the-fly opacity code and discusses the results of using on-the-fly opacity values for several stellar evolution models created with the Modules for Experiments in Stellar Astrophysics (MESA) code. These models show that the effect of using on-the-fly opacity is more pronounced in models where the relative abundance of carbon to oxygen in the outer layers of the star changes significantly over the course of the star’s evolution.
Author: Ludmilla Kolokolova
Publisher: Cambridge University Press
ISBN: 1107043905
Category : Science
Languages : en
Pages : 507
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Book Description
A comprehensive review of state-of-the-art techniques, models and research methods in modern astronomical polarimetry.
Author: Brian David Crosby
Publisher:
ISBN: 9781339974927
Category : Electronic dissertations
Languages : en
Pages : 233
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Book Description
Author: Jeffrey L. Linsky
Publisher: Springer Science & Business Media
ISBN: 9401119643
Category : Science
Languages : en
Pages : 646
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Book Description
The original plans for a meeting to celebrate the second centenary of the As tronomical Observatory of Palermo were for a celebration with a double character. The gathering was to have both a historical character, appropriate for a bicenten nial, and a technical character, to note and chronicle the new phase of the history of the Observatory, which has prospered in parallel with the development of this fairly recent topic in astronomical research, the physics of stellar and solar coronae. After the untimely death of the Observatory's Director, Giuseppe S. Vaiana (Pippo to his many friends), a number of colleagues and friends insisted that the celebration should nevertheless be held and should be dedicated to this farsighted scientist who stimulated the development of coronal physics from the early x-ray observations of the solar corona to the recognition of coronae as an observable feature of nearly all stars. This memorial dedication did not change the character of the meeting, which was held in Palermo from 22 to 26 June 1992; as his contributions are very alive in the papers presented at the meeting and collected here, Pippo Vaiana has certainly achieved his place in the history of Astronomy.
Author: Peter Ulmschneider
Publisher: Springer Science & Business Media
ISBN: 364287455X
Category : Science
Languages : en
Pages : 663
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Book Description
One of the great problems of astrophysics is the unanswered question about the origin and mechanism of chromospheric and coronal heating. Just how these outer stellar envelopes are heated is of fundamental importance, since all stars have hot chromospheric and coronal shells where the temperature rises to millions of degrees, comparable to the temperatures in the stars' cores. Here for the first time is a comprehensive inventory of the proposed chromospheric and coronal heating theories. The proposed heating processes are critically compared, and the observational evidence for the various mechanisms is reviewed. This is essential reading for all those working in such fields as stellar activity, radio and XUV emission, rotation, and mass loss, for whom a detailed and consistent presentation of our knowledge of chromospheric and coronal heating mechanisms is urgently needed.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1020
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Book Description
Author: Karel van der Hucht
Publisher: Cambridge University Press
ISBN: 9780521896832
Category : Science
Languages : en
Pages : 758
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Book Description
Recording the proceedings of the IAU XXVI General Assembly, this volume of the IAU Highlights of Astronomy covers virtually all aspects of modern astrophysics as discussed by 2400 participants from 73 countries. Notably, the common aspects of astrophysical phenomena known to exist in widely differing interstellar environments is thoroughly examined, providing fertile cross correlation from one specialisation to another. This text highlights the importance of the triennial IAU General Assemblies in bringing together the work of observers and theoreticians in widely different fields, but working towards a common goal: understanding the physics of the Universe. Together with the Proceedings of the IAU Symposia 235-240, this volume examines all of the astrophysics presented at the General Assembly.
