Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-12-17
Astronomy and Astrophysics
Astrophysics
43 pages, 14 figures
Scientific paper
10.1086/305210
We examine in detail several aspects of the physics of accretion disks of possible relevance to the outburst mechanism of the black hole X-ray transients. We adopt the one dimensional, time dependent model described in detail by Cannizzo, Chen, & Livio with parameters appropriate for a system such as A0620-00. We investigate (1) the effect of the grid spacing, utilizing a logarithmic radial spacing $\Delta r\propto r$ in addition to the spacing $\Delta r\propto \sqrt{r}$, (2) the dependence of the local flow speed of gas within the hot part of the disk on radius and time during the time of the cooling wave propagation, (3) the shape of the outburst light curve as a function of the triggering location for the instability, (4) the long term light curves of outbursts taken from trials in which complete cycles of quiescence and outburst are followed, both with and without including the effect of evaporation or removal of matter from the inner edge of the disk, and (5) the strength of the self-irradiation of the outer parts of the disk by the X-rays from the inner disk.
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