Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-11
Astronomy and Astrophysics
Astrophysics
12 pages, including 4 figures and a table, LaTeX (emulateapj.sty; newapa.sty for bibliography definitions); accepted for publi
Scientific paper
10.1086/308615
We test whether the model proposed by Esin et al. to explain X-ray observations of the black hole soft X-ray transient GRS 1124-68 in outburst can also explain the optical lightcurves of a similar object A0620-00. We show that to reproduce the observed X-ray to optical flux ratio in A0620-00, we need to assume X-ray irradiation of the outer disk that is significantly in excess of what is expected for a standard planar disk. With enhanced irradiation, the Esin et al. model can reproduce the optical evolution of A0620-00 in outburst very well. Though we find that optical observations of GRS 1124-68 also imply enhanced X-ray heating of the outer disk, the irradiation appears to be a factor of roughly 3 weaker in this system than in A0620-00. This is surprising, since GRS 1124-68 has a larger disk. We speculate that enhanced irradiation may be due to disk warping, and that the degree of warping differs between the two binaries.
Esin Ann A.
Kuulkers Erik
McClintock Jeffrey E.
Narayan Ramesh
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