X-ray and UV radiation from accreting nonmagnetic degenerate dwarfs. II

Details X-ray and UV radiation from accreting nonmagnetic degenerate dwarfs. II X-ray and UV radiation from accreting nonmagnetic degenerate dwarfs. II

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apjs...48..239k&link_type=abstract

Astrophysical Journal Supplement Series, vol. 48, Mar. 1982, p. 239-272.

Astronomy and Astrophysics

Astrophysics

92

Binary Stars, Stellar Mass Accretion, Stellar Radiation, Ultraviolet Radiation, White Dwarf Stars, X Ray Sources, Bremsstrahlung, Compton Effect, Radiation Pressure, Stellar Luminosity, Stellar Mass, X Ray Spectra

Scientific paper

Numerical calculations of X-ray and UV emission from accreting nonmagnetic degenerate dwarfs are reported, which span the entire range of accretion rates and stellar masses. Calculations include the effects of bremsstrahlung, Compton cooling, radiation pressure, albedo of the stellar surface, Compton degradation and free-free abscription of the X-ray spectrum by the accreting matter. Maximum X-ray luminosity for degenerate dwarfs undergoing spherical accretion is found to be 2.2 x 10 to the 36th ergs/s, which is little changed if accretion occurs radially over only a fraction of the stellar surface, so that the emitted radiation escapes without significant scattering. The temperature characterizing the X-ray spectra produced by degenerate dwarfs strongly depends on the stellar mass and the accretion rate, and it is suggested that the correlation between spectral temperature and luminosity is an important signature of degenerate X-ray sources.

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