THE ROLE OF MAGNETIC STELLAR WIND IN THE EVOLUTION OF CATACLYSMIC BINARIES

The correlation between the deceleration rate of stellar rotation, and the mass of the star is discussed on base on data of rotation for mai n-sequence stars of the Hyades cluster, and field stars. It is shown, that magnetic stellar wind influences substantial the evolution of clo se binaries only, if the mass of the donor, a main-sequence star, does not exceed approximately 0.9 M.. In this paper the evolution of catac lysmic binaries with loss of orbital momentum, caused by magnetic stel lar wind is studied. Four deceleration laws: the empirical Skumanich l aw, formulated for the equatorial velocity, and for the angular veloci ty, the empirical law by Maceroni and van't Veer, and the theoretical law by Schatzman are considered. To achieve compatibility between obse rved and theoretical gaps in periods of cataclysmic variables, the app ropriate coefficients in the deceleration equations were obtained. The influence of various physical parameters of stellar evolution computa tions on the value of the theoretical gap in periods is studied.