Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....83..133a&link_type=abstract
Astronomy and Astrophysics, vol. 83, no. 1-2, Mar. 1980, p. 133-139.
Astronomy and Astrophysics
Astrophysics
53
Magnetic Field Configurations, Neutron Stars, Stellar Atmospheres, Stellar Magnetic Fields, Stellar Mass Accretion, X Ray Sources, Earth Magnetosphere, Kelvin-Helmholtz Instability, Stellar Models, Stellar Rotation, Turbulent Diffusion
Scientific paper
The paper studies the interaction of a thin Keplerian accretion disk with the magnetosphere of a rotating neutron star. The neutron star's axis of rotation is assumed to be perpendicular to and the magnetic dipole axis parallel to the disk plane. In such a configuration the disk can penetrate diamagnetically into the magnetosphere. The velocity difference between the disk material and the magnetosphere leads to a Kelvin-Helmholtz instability of the interface. This instability can grow to large amplitudes only within a narrow ring around the corotation radius. It can give rise to turbulent diffusion of the disk material into the magnetosphere. Part of this material will fall onto the neutron star, the rest will be flung out of the system. This can lead to an approximate balance between braking and acceleration of the neutron star. Application of the model to the pulsating X-ray source Her X-1 gives a natural explanation of the observed temporal variation of the pulse period.
Anzer Ulrich
Boerner Gerhard
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