Structure And Emission Properties Of Accretion Disks
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Structure And Emission Properties Of Accretion Disks
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Author : C. BERTOUT (Ed)
language : en
Publisher: Atlantica Séguier Frontières
Release Date : 1991
Structure And Emission Properties Of Accretion Disks written by C. BERTOUT (Ed) and has been published by Atlantica Séguier Frontières this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Accretion (Astrophysics) categories.
Structure And Emission Properties Of Accretion Disks
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Author :
language : en
Publisher:
Release Date : 1990
Structure And Emission Properties Of Accretion Disks written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
Literature 1991 Part 2
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Author : Astronomisches Rechen-Institut
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Literature 1991 Part 2 written by Astronomisches Rechen-Institut 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 2013-06-29 with Science categories.
"Astronomy and Astrophysics Abstracts" appearing twice a year has become oneof the fundamental publications in the fields of astronomy, astrophysics andneighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. The abstrats are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world.
High Angular Resolution Studies Of The Structure And Evolution Of Protoplanetary Disks
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Author : Joshua Eisner
language : en
Publisher: Universal-Publishers
Release Date : 2005
High Angular Resolution Studies Of The Structure And Evolution Of Protoplanetary Disks written by Joshua Eisner and has been published by Universal-Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Science categories.
Young stars are surrounded by massive, rotating disks of dust and gas, which supply a reservoir of material that may be incorporated into planets or accreted onto the central star. In this dissertation, I use high angular resolution observations at a range of wavelengths to understand the structure, ubiquity, and evolutionary timescales of protoplanetary disks. First, I describe a study of Class I protostars, objects believed to be at an evolutionary stage between collapsing spherical clouds and fully-assembled young stars surrounded by protoplanetary disks. I use a Monte Carlo radiative transfer code to model new 0.9 micron scattered light images, 1.3 mm continuum images, and broadband spectral energy distributions. This modeling shows that Class I sources are probably surrounded by massive protoplanetary disks embedded in massive infalling envelopes. For the best-fitting models of the circumstellar dust distributions, I determine several important properties, including envelope and disk masses, mass infall rates, and system inclinations, and I use these results to constrain the evolutionary stage of these objects. Second, I discuss observations of the innermost regions of more evolved disks around T Tauri and Herbig Ae/Be stars, obtained with the Palomar Testbed and Keck Interferometers. I constrain the spatial and temperature structure of the circumstellar material at sub-AU radii, and demonstrate that lower-mass stars are surrounded by inclined disks with puffed-up inner edges 0.1-1 AU from the star. In contrast, the truncated inner disks around more massive stars may not puff-up, indicating that disk structure depends on stellar properties. I discuss the implications of these results for disk accretion, terrestrial planet formation and giant planet migration. Finally, I put these detailed studies of disk structure into a broader context by constraining the mass distribution and evolutionary timescales of circumstellar disks. Using the Owens Valley Millimeter Array, I mapped the millimeter continuum emission toward >300 low-mass stars in the NGC 2024 and Orion Nebula clusters. These observations demonstrate that the average disk mass in each cluster is comparable to the "minimum-mass protosolar nebula," and that there may be disk evolution on one million year timescales.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1993
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Physics categories.
Accretion Disks In Compact Stellar Systems
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Author : J Craig Wheeler
language : en
Publisher: World Scientific
Release Date : 1993-12-22
Accretion Disks In Compact Stellar Systems written by J Craig Wheeler and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-12-22 with categories.
Accretion disks in compact stellar systems containing white dwarfs, neutron stars or black holes are the principal laboratory for understanding the role of accretion disks in a wide variety of environments from proto-stars to quasars. Recent work on disk instabilities and dynamics has given a new theoretical framework with which to study accretion disks. Modeling of time-dependent phenomena provides new insight into the causes and interpretation of photometric and spectroscopic variability and new constraints on the fundamental physical problem — the origin of viscosity in accretion disks. This book contains expert reviews on the nature of limit cycle thermal instabilities and a variety of closely related topics from the theory of angular momentum transport to eclipse mapping of the disk structure. The result is a comprehensive contemporary survey of the structure and evolution of accretion disks in compact binary systems. Contents:Introduction to Accretion Disk Research (J Wood)The Limit Cycle Instability in Dwarf Nova Accretion Disks (J K Cannizzo)Angular Momentum Transport in Low Mass Accretion Disks (E T Vishniac & P H Diamond)The Emission Lines from Accretion Disks in Cataclysmic Variable Stars (E L Robinson et al.)Eclipse Mapping of Accretion Disks: The First Decade (K Horne)Atmospheres of Accretion Disks and the Emerging Spectra (G Shaviv & R Wehrse)Disks and Magnetospheres (A R King & J P Lasota)Mass Loss and the Boundary Layer (J E Drew & W Kley)The Interaction between the Stream and the Accretion Disk (M Livio)Tidal Effects on Accretion Disks in Close Binary Systems (Y Osaki et al.)Accretion Disks in Bright X-Ray Binaries (H Inoue)X-Ray Illumination Models of Soft X-Ray Transients (J M Hameury et al.)Black Hole Accretion Disk Instabilities (S Mineshige & M Kusunose) Readership: Graduate students and researchers in astrophysics. keywords:Accretion Disks in Compact Stellar Systems;Accretion Disks;Cataclysmic Variables;Magnetospheres;Tides;X-Ray Novae;Black Holes;White Dwarfs;Neutron Stars;Eclipse Mapping;Mass Transfer “… a useful source of information on the recent developments of accretion disks as well as a reference book. I would recommend this book to scientists who wish to enlarge their knowledge on the present state of art of the field. Of course, it should be present in any astronomical library.” Classical & Quantum Gravity
Theory Of Black Hole Accretion Discs
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Author : Marek A. Abramowicz
language : en
Publisher: Cambridge University Press
Release Date : 1998
Theory Of Black Hole Accretion Discs written by Marek A. Abramowicz 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 1998 with Science categories.
The first comprehensive and up-to-date review of our new understanding of accretion disks around black holes - with chapters from experts from around the world.
Theory Of Accretion Disks 2
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Author : Wolfgang J. Duschl
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Theory Of Accretion Disks 2 written by Wolfgang J. Duschl 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.
Accretion disks in astrophysics represent the characteristic flow by which compact bodies accrete mass from their environment. Their intrinsically high luminosity, and recent progress in observational accessibility at all wavelength bands, have led to rapidly growing awareness of their importance and made them the object of intense research on widely different scales, ranging from binary stars to young stellar objects and active galactic nuclei. This book contains the proceedings of the NATO Advanced Workshop on `Theory of Accretion Disks 2' for which some of the most active researchers in the different fields came together at the Max-Planck-Institut for Astrophysics in Garching in March, 1993. Its reviews and contributions give an up-to-date account of the present status of our understanding and provide a stimulating challenge in discussions of open questions in a rapidly developing field.
Theory Of Accretion Disks
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Author : F. Meyer
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Theory Of Accretion Disks written by F. Meyer 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.
With the advent of space observatories and modern developments in ground based astronomy and concurrent progress in the theoretical understanding of these observations it has become clear that accretion of material on to compact objects is an ubiquitous mechanism powering very diverse astrophysical sources ranging in size and luminosity by many orders of magnitude. A problem common to these systems is that the material accreted must in general get rid of its angular momentum and this leads to the formation of an Accretion Disk which allows angular momentum re-distribution and converts potential energy into radiation with an efficiency which can be higher than the nuclear burning yield. These systems range in size from quasars and active galactic nuclei to accretion disks around forming stars and the early solar system and to compact binaries such as cataclysmic variables and low-mass X-ray binaries. Other objects that should be mentioned in this context are 88433, the black hole binary candidates, and possibly gamma-ray burst sources. Observations of these systems have provided important constraints for theoretical accretion disk models on widely differing scales, lumi nosities, mass-transfer rates and physical environments.
Accretion Power In Astrophysics
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Author : Juhan Frank
language : en
Publisher: Cambridge University Press
Release Date : 2002-01-17
Accretion Power In Astrophysics written by Juhan Frank 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 2002-01-17 with Science categories.
Accretion Power in Astrophysics examines accretion as a source of energy in both binary star systems containing compact objects, and in active galactic nuclei. Assuming a basic knowledge of physics, the authors describe the physical processes at work in accretion discs and other accretion flows. The first three chapters explain why accretion is a source of energy, and then present the gas dynamics and plasma concepts necessary for astrophysical applications. The next three chapters then develop accretion in stellar systems, including accretion onto compact objects. Further chapters give extensive treatment of accretion in active galactic nuclei, and describe thick accretion discs. A new chapter discusses recently discovered accretion flow solutions. The third edition is greatly expanded and thoroughly updated. New material includes a detailed treatment of disc instabilities, irradiated discs, disc warping, and general accretion flows. The treatment is suitable for advanced undergraduates, graduate students and researchers.