Critical accretion flow of gas onto compact stars

Details Critical accretion flow of gas onto compact stars Critical accretion flow of gas onto compact stars

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..52...35o&link_type=abstract

Astrophysics and Space Science, vol. 52, no. 1, Nov. 1977, p. 35-49.

Astronomy and Astrophysics

Astrophysics

14

Gas Flow, Optical Thickness, Stellar Mass Accretion, Neutron Stars, Numerical Integration, Radiation Pressure, Shock Fronts, Standing Waves, Time Dependence, White Dwarf Stars, X Rays

Scientific paper

The critical accretion flow of gas onto compact stars with mass of 0.6 solar mass is investigated by numerical integrations of the time-dependent hydrodynamic equations in the spherically symmetric and optically thick case. For compact stars surrounded by such a dense cloud of gas, the radiation-pressure force decelerates the infalling gas significantly, and a free-fall regime of the gas is not at all attained. This results in low incident velocities at the standing shock front close to the stellar surface, low temperatures of the gas around the compact stars, and no X-rays in white dwarfs but soft X-rays in neutron stars. Some applications of the results to X-ray sources are discussed.

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