MATTER FLOW FORMATION IN SEMIDETACHED ECL IPSING BINARIES OF AO CASSIOPEIAE TYPE

We determined, by means of calculations in the frame of nonstationary hydrodynamics in Euler's formulation using the method of large particl es and taking into account our analysis of observational data, the pro perties of the matter flow near the first Lagrangian point for the sem idetached systems AO Cas, V448 Cyg, and XZ Cep. A flow of matter in th e direction of the second component arises when one of the system's co mponents expands and the inner layers of its atmosphere reach the firs t Lagrangian point. This flow has axial symmetry, its size is about 20 % that of the star of its origin, and the matter exchange rate is simi lar to 10(-7) M. year(-1). Such parameters of the matter flow from AO Cas type stars are considerably lower than those for W Ser eclipsing b inaries.