Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.299...31c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 299, Issue 1, pp. 31-46.
Astronomy and Astrophysics
Astronomy
16
Accretion, Accretion Discs, Magnetic Fields, Turbulence, Stars: Magnetic Fields
Scientific paper
The problem of the effect of a strongly magnetic star on a surrounding accretion disc is considered. For stellar rotation periods greater than a critical value, a numerical solution is found for a steady disc with turbulent magnetic diffusion, including electron scattering opacity and radiation pressure. Inside the corotation radius, the extraction of disc angular momentum by magnetic coupling to the star becomes strong and this leads to enhanced viscous stress and dissipation. The resulting elevated temperature causes electron scattering opacity and radiation pressure to become significant further from the star than in the absence of its magnetic field. The disc ends as its height increases rapidly due to the large central pressure, its density decreases and magnetically induced viscous instability occurs.
Campbell Chris G.
Heptinstall P. M.
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