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Home Search Quick Search Advanced Fulltext Browse Collections Persons My eDoc Session History Login Name: Password: Documentation Help Support Wiki Direct access to document ID:	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. Language: English Date of Publication (YYYY-MM-DD): 2002 Title of Journal: Astronomy Report Journal Abbrev.: Astron. Rep. Volume: 46 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 Identifiers: ISI:000176054700004 ISSN:1063-7729 The scope and number of records on eDoc is subject to the collection policies defined by each institute - see "info" button in the collection browse view.