Non-Steady State Accretion Disks in X-Ray Novae: Outburst Models for Nova Monocerotis 1975 and Nova Muscae 1991

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dc.creatorLipunova, G. V.
dc.creatorShakura, N. I.
dc.date2009-05-15
dc.date.accessioned2026-07-07T13:15:36Z
dc.date.available2026-07-07T13:15:36Z
dc.descriptionWe fit outbursts of two X-ray novae (Nova Monocerotis 1975=A0620-00 and Nova Muscae GS 1991=1124-683) using a time-dependent accretion disk model. The model is based on a new solution for a diffusion-type equation for the non-steady-state accretion and describes the evolution of a viscous alpha-disk in a binary system after the peak of an outburst, when 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 delta t. Results of the modeling are compared with the observed X-ray and optical B and V light curves. The resulting estimates for the turbulence parameter $α$ are similar: 0.2-0.4 for A 0620-00 and 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 also derive the distances to these systems as functions of the masses of their compact objects.
dc.description10 pages, 7 figures; style improved
dc.identifierhttps://arxiv.org/abs/0905.2515
dc.identifierhttp://arxiv.org/abs/0905.2515
dc.identifierAstronomy Reports, Volume 46, pp. 366-379 (2002)
dc.identifierdoi:10.1134/1.1479424
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/230522
dc.subjectHigh Energy Astrophysical Phenomena
dc.titleNon-Steady State Accretion Disks in X-Ray Novae: Outburst Models for Nova Monocerotis 1975 and Nova Muscae 1991
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