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          Institute: MPI für Astrophysik     Collection: High Energy Astrophysics at MPA     Display Documents

ID: 12163.0, MPI für Astrophysik / High Energy Astrophysics at MPA
Non-steady-state accretion disks in X-ray novae: Outburst models for Nova Monocerotis 1975 and Nova Muscae 1991
Authors:Lipunova, G. V.; Shakura, N. I.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Astronomy Report
Journal Abbrev.:Astron. Rep.
Issue / Number:5
Start Page:366
End Page:379
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We have fit outbursts of two X-ray novae (Nova Monocerotis 1975 = A 0620-00 and Nova Muscae GS 1991 = 1124-683) using a non- steady-state accretion-disk model. The model is based on a new solution for a diffusion-type equation for non-steady-state accretion and describes the evolution of a viscous a disk in a binary system after the peak of the outburst, when the matter in the disk is totally ionized. The accretion rate in the disk decreases according to a power law. We derive formulas for the accretion rate and effective temperature of the disk. The model has three free input parameters: the mass of the central object M, the turbulence parameter alpha, and the normalization parameter deltat. The results of the modeling are compared with the observed X-ray and optical B and V light curves. The estimates for the turbulence parameter alpha are similar: 0.2- 0.4 for A 0620-00 arid 0.45-0.65 for GS 1124-683, Suggesting a similar nature for the viscosity in the accretion disks around the compact objects in these sources. We have also derived the distances to these systems as functions of the masses of their compact objects. (C) 2002 MAIK "Nauka/Interperiodica".
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:Sternberg Astron Inst, Universitetskii Pr 13, Moscow 119899,; Russia; Sternberg Astron Inst, Moscow 119899, Russia; Max Planck Inst Astrophys, D-8046 Garching, Germany
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