Volume 509, January 2010
|Number of page(s)||8|
|Section||Stellar structure and evolution|
|Published online||15 January 2010|
The structure of thin accretion discs around magnetised stars
Department of Physics, Addis Ababa University,
PO Box 1176, Addis Ababa, Ethiopia e-mail: firstname.lastname@example.org
2 Department of Physics, University of Gothenburg, SE 412 96 Gothenburg, Sweden e-mail: email@example.com
Accepted: 30 September 2009
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 and depending mainly on the strength and direction of the magnetic field generated by the dynamo in the disc
Key words: accretion, accretion discs / magnetohydrodynamics (MHD) / magnetic fields / stars: neutron / X-rays: stars / stars: pre-main sequence
© ESO, 2010
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