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The structure of thin accretion discs around magnetised stars

Journal article
Authors Solomon Belay Tessema
Ulf Torkelsson
Published in Astronomy & Astrophysics
Volume 509
Pages A45
ISSN 0004-6361
Publication year 2010
Published at Department of Physics (GU)
Pages A45
Language en
Keywords accretion, accretion discs, magnetohydrodynamics (MHD), magnetic fields, stars: neutron, X-rays: stars, stars: pre-main sequence
Subject categories Formation and development of stars, High energy astrophysics


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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