Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122...73a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 73-78.
Astronomy and Astrophysics
Astrophysics
51
Magnetic Stars, Neutron Stars, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Models, Stellar Rotation, Accretion Disks, Angular Momentum, Kelvin-Helmholtz Instability, Kepler Laws, Magnetic Dipoles, Plasma Diffusion, Turbulent Diffusion, X Ray Sources
Scientific paper
The surface of an accretion disk in a rotating neutron star's magnetic field is subject to the Kelvin-Helmholtz instability induced by the velocity difference of the rigidly rotating magnetosphere and the Keplerian disk. This instability is analysed in a simplified geometry. It is shown that a large part of the disk surface will become unstable, leading to a turbulent diffusion of the disk plasma into the magnetosphere. The resulting exchange of angular momentum between the neutron star and the accreting matter is described. The present model of a magnetic dipole axis perpendicular to the rotation axis of the neutron star is compared to the model of an aligned rotator. The observational consequences with respect to the rotational state of pulsating X-ray sources are discussed.
Anzer Ulrich
Boerner Gerhard
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