Vertical Convection in Turbulent Accretion Disks and Light Curves of the A0620-00 1975 Outburst

Abstract

We present a model of the non-stationary $\alpha$-disk with account for the irradiation and the vertical convection in the outer accretion disk where hydrogen is partially ionized. We include the viscous energy generation in the mix-length convection equations in accretion disks. The optical and X-ray light curves of X-ray nova A0620-00 are investigated in terms of this model. The turbulent viscosity parameter of the accretion disk is estimated, $\alpha =0.5÷0.6$, which is necessary to explain the luminosity decay rate on the descending branch of the X-ray light curve for the A0620-00 1975 outburst. The secondary luminosity maximum on the light curves is explained by assuming an additional injection of matter into the accretion disk from the optical companion.

23 pages, 4 figures. Accepted for publication in Astronomy Letters

References in corpus (3)

• The Evolution of Compact Binary Star Systems
• Modeling of non-stationary accretion disks in X-ray novae A 0620-00 and GRS 1124-68 during outburst
• Evolution of finite viscous disks with time-independent viscosity

Cited by in corpus (6)

• On the physical nature of accretion disc viscosity
• Propagating mass accretion rate fluctuations in X-ray binaries under the influence of viscous diffusion
• Determination of the turbulent parameter in the accretion disks: effects of self-irradiation in 4U 1543-47 during the 2002 outburst
• The effect of thermal winds on the outbursts evolution of LMXB systems
• Analysis of accretion disc structure and stability using open code for vertical structure
• Ya. B. Zeldovich and foundation of the accretion theory