... Kremlevskaya 18, Kazan, 420008 Tatarstan, Russia Received October 15, 2005; in final form, February 6, 2006 Abstract--We interpret the observed radial-velocity curve of the optical star in the low-mass X-ray binary 2S 0921630 using a Roche model, taking into account the X-ray heating of the optical star and screening of X-rays coming from the relativistic object by the accretion disk. ... Mass of the compact object in the 2S 0921-630 X-ray binary for various models, with kx = 10 Model Table 6. ...
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