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Optical Lightcurves of the Black Hole Binaries GRS 1124-68 and A0620-00 in Outburst: the Importance of Irradiation | | Ann A. Esin
; Erik Kuulkers
; Jeffrey E. McClintock
; Ramesh Narayan
; | | Date: |
11 Nov 1999 | | Subject: | astro-ph | | Affiliation: | Caltech), Erik Kuulkers (Space Research Organization Netherlands; Utrecht University), Jeffrey E. McClintock, Ramesh Narayan (Harvard-Smithsonian Center for Astrophysics | | Abstract: | 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. | | Source: | arXiv, astro-ph/9911197 | | Services: | Forum | Review | PDF | Favorites | |
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