The structure of thin accretion discs around magnetised stars

Details The structure of thin accretion discs around magnetised stars The structure of thin accretion discs around magnetised stars

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010a%26a...509a..45t&link_type=abstract

Astronomy and Astrophysics, Volume 509, id.A45

Astronomy and Astrophysics

Astrophysics

5

Accretion, Accretion Discs, Magnetohydrodynamics (Mhd), Magnetic Fields, Stars: Neutron, X-Rays: Stars, Stars: Pre-Main Sequence

Scientific paper

Aims: We determine the steady-state of an axisymmetric thin accretion disc with an internal dynamo around a magnetised star. Methods: Starting from the vertically integrated equations of magnetohydrodynamics we derive a single ordinary differential equation for a thin accretion disc around a massive magnetic dipole and integrate this equation numerically from the outside inwards. Results: Our numerical solution shows that the torque between the star and the accretion disc is dominated by the contribution from the dynamo in the disc. The location of the inner edge of the accretion disc varies between R_A and 10~R_A depending mainly on the strength and direction of the magnetic field generated by the dynamo in the disc

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