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Stability of radiat...
Stability of radiation-pressure dominated disks: I. the dispersion relation for a delayed heating α-viscosity prescription
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Ciesielski, A. (author)
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Wielgus, M. (author)
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Kluźniak, W. (author)
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Sa̧dowski, A. (author)
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- Abramowicz, Marek A, 1945 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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Lasota, J. P. (author)
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Rebusco, P. (author)
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(creator_code:org_t)
- 2012-02-17
- 2012
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 538
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https://www.aanda.or...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We derive and investigate the dispersion relation for accretion disks with retarded or advanced heating. We follow the α-prescription but allow for a time offset τ between heating and pressure perturbations, as well as for a diminished response of heating to pressure variations. We study in detail solutions of the dispersion relation for disks with radiation-pressure fraction, 1-β, and ξ, the ratio of viscous stress response to pressure perturbations. For τ < 0 (advanced heating) the number and sign of real solutions for the growth rate depend on the values of τ, and ξ: if the magnitude of τ is larger than a critical value (e.g., more than twice the thermal time,-τ > 2 τ th, for β = 0 and ξ = 1) two real solutions exist, which are both negative. These results imply that radiation-pressure dominated accretion disks may be stabilized when there is a time delay between stress fluctuations and fluctuations in heating. © 2012 ESO.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- accretion
- accretion disks
- hydrodynamics
- instabilities
Publication and Content Type
- ref (subject category)
- art (subject category)
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