Physics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt.........8g&link_type=abstract
Ph.D. Thesis Illinois Univ., Urbana-Champaign.
Physics
Deposition, Magnetic Stars, Magnetohydrodynamics, Neutron Stars, Rotating Matter, Flow Measurement, Magnetic Fields, Rotating Bodies, Spin Dynamics, Torque, X Ray Sources
Scientific paper
A historical introduction to four studies, in which a theory is developed of accretion by rotating magnetic neutron stars, is provided. A detailed magnetohydrodynamic description of the accretion flow and the magnetic field configuration within the magnetosphere of the neutron star is given. It is shown that bounds on the accretion torque exerted on the star can be obtained by applying general conservation laws to the flow in the transition zone between the magnetosphere flow and the exterior flow. The location, size, and the structure of the transition zone in the case of accretion from a Keplerian disk are determined. Results are applied to pulsating X-ray sources and it is shown that the secular spin-up rates of all the measured sources can be accounted for quantitatively if it is assumed that these sources are accreting from Keplerian disks and have magnetic moments of approximately 10 to the 29th power to 10 to the 32d power.
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