Modelling of Light and Radial Velocity Curves in X-Ray Binary Systems

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Scientific paper

Synthesis methods for close binary systems allow one to reliably determine fundamental parameters of stars and relativistic objects (masses, radii, luminosities etc.). Our numerical models are designed to analyse light and radial velocity curves of various types of binary systems. In the present paper I focus on models developed for X-ray binaries. One of them was used for analysis of hard X-ray light curves (25-50 keV) of the unique object SS433 obtained by the INTEGRAL observatory. The orbital and precessional variability was computed in a model of a binary system containing a precessing accretion disk. I also present a model for a generic X-ray binary including a point X-ray source and an optical star. Heating of the optical star by the incident X-ray radiation is taken into account by model atmosphere calculations. The model allows one to compute absorption-line profiles and radial velocity curves of the optical component. Using this model the masses of relativistic objects in the X-ray binaries Cyg X-1, Her X-1, 2S 0921-630 and some others were refined.

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