Issue |
A&A
Volume 491, Number 1, November III 2008
Diagnostics of interstellar hydrogen in the heliosphere
|
|
---|---|---|
Page(s) | 267 - 277 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:200810155 | |
Published online | 01 October 2008 |
Modeling of non-stationary accretion disks in X-ray novae A 0620–00 and GRS 1124–68 during outburst
1
Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, 72076 Tübingen, Germany e-mail: suleimanov@astro.uni-tuebingen.de
2
Kazan State University, Kremlevskaja str., 18, Kazan 420008, Russia
3
Sternberg Astronomical Institute, Moscow State University, Universitetskij pr., 13, 119992, Moscow, Russia e-mail: [galja;shakura]@sai.msu.ru
Received:
7
May
2008
Accepted:
7
September
2008
Aims. We address the task of modeling soft X-ray and optical light curves of X-ray novae in the high/soft state.
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.
Results. The model is applied to the outbursts of X-ray nova Monocerotis 1975 (A 0620-00) and
X-ray nova Muscae 1991 (GRS 1124-68). 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: and ≤0.4, and on the viscosity parameter α of the disks:
and
. We also conclude that the accretion disks should have an
effective geometrical thickness
times greater than the theoretical value of the distance between the photometric layers.
Key words: binaries: close / X-rays: binaries / stars: individual: Nova Mon 1975 / stars: individual: Nova Mus 1991
© ESO, 2008
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