Supercritical time-dependent accretion onto compact objects. I - Neutron stars

Details Supercritical time-dependent accretion onto compact objects. I - Neutron stars Supercritical time-dependent accretion onto compact objects. I - Neutron stars

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..912k&link_type=abstract

Astrophysical Journal, Part 1, vol. 237, May 1, 1980, p. 912-930.

Astronomy and Astrophysics

Astrophysics

23

Hydrodynamic Equations, Neutron Stars, Stellar Mass Accretion, Time Dependence, Eddington Approximation, Magnetohydrodynamic Flow, Radiation Distribution, Radiative Heat Transfer, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution, Stellar Luminosity, Stellar Radiation, Stellar Winds, Temperature Distribution

Scientific paper

The time-dependent flow resulting from spherically symmetric, supercritical accretion onto a nonmagnetic neutron star is computed for accretion rates between 3 and 30. In addition, the fully time-dependent self-consistent set of coupled radiation-hydrodynamic equations governing such flow has been solved. Effects that have not previously been treated are taken into account, including separate energy equations for ions and electrons allowing for nonequilibrium, variable Eddington factors in the radiation transfer to account for anisotropy of the radiation field due to highly spherically extended envelopes, and convection of ions, electrons and photons in the accretion envelope. It is found that supercritical flow, for material falling from a radius of less than 10 to the 10th cm, is characterized by stable accretion with no evidence of stellar wind outflow at any phase of the evolution.

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