Three-dimensional hydrodynamical modeling of mass transfer in the close binary system beta Lyr with an accretor wind

摘要

We present three-dimensional hydrodynamical modeling of mass transfer in the close binary system beta Lyr taking into account explicitly radiative cooling and the stellar wind of the accretor. Our computations show that flow forces wind out from the orbital plane, where an accretion disk with a radius of 0.4-0.5 and a height of about 0.15-0.17 (in units of orbital separation) is formed. Gas motions directed Upward from the orbital plane are initiated in the region of interaction of the flow from L-1 and the accretor wind (x = 0.91, y = -0.17); i.e., a jetlike structure forms. This structure has the shape of a gas pillar above the orbital plane, where gas moves with the velocity of stellar wind. The number density of the gas in this structure is about 10(14) cm(-3), and its temperature is 20000-45000 K. At heights of about 0.15-0.20 above the orbital plane, in the region between the jetlike structure and the disk, two spiral shocks form. It is possible that the emission lines observed in the spectrum of beta Lyr binary originate in this region.