The accreting component of mass-exchange binaries

Details The accreting component of mass-exchange binaries The accreting component of mass-exchange binaries

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..509u&link_type=abstract

Astrophysical Journal, vol. 206, June 1, 1976, pt. 1, p. 509-514.

Astronomy and Astrophysics

Astrophysics

66

Binary Stars, Mass Transfer, Stellar Evolution, Stellar Mass Ejection, Stellar Models, X Ray Stars, Orbital Elements, Shock Waves, Stellar Luminosity, Stellar Mass, Stellar Temperature, X Ray Binaries

Scientific paper

The effect of rapid accretion on a moderate-mass stellar model is studied. The surface boundary condition is examined for two modes of accretion - disk and direct impact. It is found that the effective temperature must be increased for disk accretion but not for direct-impact accretion. In the latter mode the excess kinetic energy of the transfer stream is radiated in an optically thick hot spot or in a hot equatorial band. The remainder of the star is unaffected by the direct-impact accretion. Evolutionary calculations for direct-impact accretion show that the mass-gaining star swells. The present orbital elements of X-ray binaries indicate that these systems went through a contact phase of evolution. Significant quantities of mass and angular momentum may have been lost at that time.

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