ESTIMATES OF GEOMETRIC AND DYNAMIC PARAME TERS OF STAR-GAS COMPLEXES IN THE GALAXY

Parameters of geometric models of 11 gas-star complexes (GSCs) were ob tained. We used information about GSC's projections onto the celestial sphere and the Galactic plane and about GSC's extension dong the line of sight. GSCs were represented as triaxial ellipsoids. To estimate t he semiminor axis of GSC's ellipsoidal model and GSC's slope angle to the Galactic plane, we used data on spatial location of open stellar c lusters (OSCs) entering GSCs. GSC's slopes to the Galactic plane vary between 2 degrees.5 and 20 degrees.5. Their semiminor axes are between 11 and 164 pc. GSC's total masses are estimated from GSC's tidal effe ct on OSCs that are members of the corresponding GSCs. The effect mani fests itself in smaller sizes of young OSCs as compared to their tidal sizes in the force field of the Galaxy. We used studies of stability of an OSC moving in the joint force field of the Galaxy and spheroidal stationary GSC, as well as the studies of evolution of a virialized c luster located at the center of a nonstationary ellipsoidal GSC. Estim ated total masses for different GSCs lie between 0.65 x 10(5) M(.) and 11.5 x 10(7) M(.).