The structure of thin accretion discs around magnetised stars

Solomon Belay Tessema; Ulf Torkelsson

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arXiv · 0911.2084

The structure of thin accretion discs around magnetised stars

Solomon Belay Tessema·Ulf Torkelsson

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Abstract

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 $R_{\rm A}$ and $10R_{\rm A}$ depending mainly on the strength and direction of the magnetic field generated by the dynamo in the disc

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Solomon Belay Tessema, Ulf Torkelsson. 2009-11-11. The structure of thin accretion discs around magnetised stars. https://arxiv.org/abs/0911.2084

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