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

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...

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Bibliographic Details
Published in:arXiv.org 2015-11
Main Authors: Malanchev, Konstantin, Shakura, Nikolai
Format: Article
Language:English
Subjects:
Accretion disks
Convection
Decay rate
Light curve
Luminosity
Parameter estimation
Online Access:Get full text
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Summary: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, \(\alpha = 0.5 \div 0.6\), 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.
ISSN:2331-8422
DOI:10.48550/arxiv.1511.02356