The limiting luminosity of accreting neutron stars with magnetic fields

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Luminosity, Neutron Stars, X Ray Sources, Deposition, Illuminance, Interplanetary Magnetic Fields, Mass Flow Rate, Optical Thickness, Range (Extremes), Thomson Scattering

Scientific paper

The accretion onto a magnetized neutron star in cases of high accretion rates is discussed. The equation of hydrodynamics and radiative diffusion are solved in a one-dimensional approximation; the solution is expressed in an analytical form. The limiting X-ray luminosity of accreting magnetized neutron stars is shown to depend crucially on the geometry of the accretion channel. Under certain conditions the value of X-ray luminosity may exceed the critical Eddington value, the main energy flux being carried out with neutrons. The effects connected with the gas flow along the magnetospheric surface are discussed. The plasma layer on the Alfven surface is shown to be optically thick with respect to Thomson scattering and to reradiate in soft X-rays considerable fraction of the primary X-ray flux. A necessary condition for the X-ray luminosity to exceed the Eddington limit is a certain degree of asymmetry in the distribution of matter over the Alfven surface. In the framework of the model adopted regular pulsations of hard and soft X-rays are discussed.

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