Boundary layer on the surface of a neutron star

Abstract

In an attempt to model the accretion onto a neutron star in low-mass X-ray binaries, we present two-dimensional 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 $M_{\rm star}=1.4 \times 10^{-2} \msun$ and for the gas temperature $T=5\times 10^6$ K. Our results are qualitatively different in the case of a realistic neutron star mass and a realistic gas temperature of $T\simeq 10^8$ 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.

7 pages, 7 figures

References in corpus (8)

• Millisecond Oscillations in X-Ray Binaries
• Hydromagnetic turbulence in computer simulations
• Hard X-ray Emission From Low Mass X-ray Binaries
• Boundary layer, accretion disk and X-ray variability in luminous LMXBs
• Spectra of the spreading layers on the neutron star surface and constraints on the neutron star equation of state
• Structured outflow from a dynamo active accretion disc
• Spreading of Accreted Material on White Dwarfs
• Boundary Layer Self-Similar Solution for the Hot Radiative Accretion onto a Rapidly Spinning Neutron Star

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• The vertical structure of the boundary layer around compact objects
• Kilohertz quasi-periodic oscillations from neutron star spreading layers
• A Monte Carlo estimate for the fraction of thermal Comptonized photons that impinge back on the soft source in neutron star LMXBs
• Evaluating the jet/accretion coupling of Aql X-1: probing the contribution of accretion flow spectral components