OBSERVATIONAL MANIFESTATIONS OF MATTER FL OW FEATURES IN SYMBIOTIC STARS

The results of gas dynamical calculations of the flow of material in s ymbiotic stars in the framework of a two-dimensional nonadiabatic mode l are presented. It is shown that symbiotic stars are characterized by the presence of two outwardly-directed shock waves, one in front of t he accreting star on the path of the orbital motion and the other betw een the components of the system. Clear spiral motion of the accreting matter and the presence of a stable accretion disk are also character istic. The inclusion of radiative cooling and heating of the gas in th e gas dynamical model permitted determination of the density, velocity , and temperature fields of the gas flow in the system, and calculatio n of theoretical emission line profiles in the Sobolev approximation. Analysis of the calculated H-beta emission line profiles makes it poss ible to determine the contribution of various flow regions to the line shape. The general character of the line profile properties and assoc iated features in the matter flow pattern for symbiotic stars with mas s loss rates of M(1) over dot < similar to 10(-7) M. yr(-1) (the case of complete ionization of the gas) makes it possible to use the result s of our calculations in the interpretation of observations of real st ars.