Journal Article

Boundary layer on the surface of a neutron star

N. Babkovskaia, A. Brandenburg and J. Poutanen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 386, issue 2, pages 1038-1044
Published in print May 2008 | ISSN: 0035-8711
Published online April 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13099.x
Boundary layer on the surface of a neutron star

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In an attempt to model the accretion on to a neutron star in low-mass X-ray binaries, we present 2D hydrodynamical models of the gas flow in close vicinity of the stellar surface. First, we consider a gas pressure-dominated case, assuming that the star is non-rotating. For the stellar mass we take Mstar= 1.4 × 10−2M and for the gas temperature T= 5 × 106 K. Our results are qualitatively different in the case of a realistic neutron star mass and a realistic gas temperature of T≃ 108 K, when the radiation pressure dominates. We show that to get the stationary solution in a latter case, the star most probably has to rotate with the considerable velocity.

Keywords: accretion, accretion discs; hydrodynamics; stars: neutron

Journal Article.  4612 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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