Accretion disk orientation in binary X-ray pulsars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Pulsars, Stellar Mass Accretion, X Ray Astronomy, X Ray Stars, Angular Momentum, Momentum Transfer, Plasma-Electromagnetic Interaction, Precession, Stellar Evolution, Stellar Magnetic Fields, Stellar Rotation, Stellar Structure

Scientific paper

The interaction of the accretion disk with the magnetic field of an X-ray pulsar is considered. It is shown that under real conditions, both magnetic forces and viscosity tend to expand the inner parts of the disk along the rotational equator of the neutron star. At distances of the order of the Alfven radius, the accretion disk lies practically in the equatorial plane. The inner edge radius of the disk is found at which a considerable transfer of angular momentum to the neutron star is occurring. It is shown that precession may be observable for long-period X-ray pulsars.

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