Optical light curves of luminous eclipsing black hole x-ray binaries

概要

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We examined optical V-band light curves in luminous eclipsing black hole X-ray binaries, using a supercritical accretion/outflow model that is more realistic than the formerly used ones. In order to compute the theoretical light curve in the binary system, we did not only apply the global analytic solution of the disk, but also included the effect of optically thick outflow. We found that the depth of eclipse of the companion star by the disk changed dramatically when including the effect of the outflow. Due to the effect of outflow, we could reproduce the optical light curve for typical binary parameters in SS 433. Our model with an outflow velocity of v ∼ 3000 km s-1 could fit the whole shape of the averaged V-band light curve in SS 433, but we found a possible parameter range consistent with observations, such as M ∼ 5000-10000LE/C2 (widi LE being the Eddington luminosity and c being the speed of light) and Tc = 10000K-14000K for the accretion rate and donor star temperature, respectively. Furthermore, we briefly discuss observational implications for ultraluminous X-ray sources.
2010-04-25