Modeling of non-stationary accretion disks in X-ray novae A 0620-00 and GRS 1124-68 during outburstстатья
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Аннотация:Aims: We address the task of modeling soft X-ray and optical light curves of X-ray novae in the high/soft state. <BR />Methods: The analytic model of viscous evolution of an externally truncated accretion α-disk is used. Relativistic effects near a Kerr black hole and self-irradiation of an accretion disk are taken into account. <BR />Results: The model is applied to the outbursts of X-ray nova Monocerotis 1975 (<ASTROBJ>A 0620-00</ASTROBJ>) and X-ray nova Muscae 1991 (<ASTROBJ>GRS 1124-68</ASTROBJ>). Comparison of observational data with the model yields constraints on the angular momentum (the Kerr parameter) of the black holes in A 0620-00 and GRS 1124-68: 0.3-0.6 and \le0.4, and on the viscosity parameter α of the disks: 0.7-0.95 and 0.55-0.75. We also conclude that the accretion disks should have an effective geometrical thickness 1.5-2 times greater than the theoretical value of the distance between the photometric layers.