The deceleration of infalling plasma in magnetized neutron star atmospheres - Nonisothermal atmospheres

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Magnetic Stars, Neutron Stars, Plasma Dynamics, Stellar Atmospheres, Stellar Mass Accretion, Nonisothermal Processes, Radiative Transfer, Stellar Models, Stellar Temperature, X Ray Stars

Scientific paper

This paper examines the deceleration of accreting material in the strongly magnetized plasma atmosphere of an X-ray pulsar, for accretion rates less than 0.1 times the Eddington flux. The previous work on accretion, flow deceleration is extended to nonisothermal atmospheres. A rough model of radiative processes in neutron star atmospheres bombarded by accreting material is used to calculate the atmosphere's temperature and density profiles. The atmospheric structure and the accretion flow stopping depth are computed iteratively. For cases where the infall velocity is close to the free-fall velocity, a simple prescription for an equivalent single temperature, T(iso), is given. It is found that the plasma deceleration is close to stopping in a homogeneous, isothermal atmosphere at T(iso). Exceptions to this result occur for small infall velocities.

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