NonSteadyState Accretion Disks in XRay Novae: Outburst Models for Nova Monocerotis 1975 and Nova Muscae 1991
Abstract
We have fit outbursts of two Xray novae (Nova Monocerotis 1975=A062000 and Nova Muscae GS 1991=1124683) using a nonsteadystate accretiondisk model. The model is based on a new solution for a diffusiontype equation for nonsteadystate accretion and describes the evolution of a viscous α 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 α, and the normalization parameter δt. The results of the modeling are compared with the observed Xray and optical B and V light curves. The estimates for the turbulence parameter α are similar: 0.2 0.4 for A 062000 and 0.45 0.65 for GS 1124683, 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.
 Publication:

Astronomy Reports
 Pub Date:
 May 2002
 DOI:
 10.1134/1.1479424
 arXiv:
 arXiv:0905.2515
 Bibcode:
 2002ARep...46..366L
 Keywords:

 Astrophysics  High Energy Astrophysical Phenomena
 EPrint:
 10 pages, 7 figures