Magnetic torques between accretion discs and stars

Details Magnetic torques between accretion discs and stars Magnetic torques between accretion discs and stars

1998-03-06

arxiv.org/abs/astro-ph/9803068v1

Astronomy and Astrophysics

Astrophysics

5 pages, MN LaTeX-style, submitted to MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01927.x

I show in this paper that two types of magnetic torques can appear in the interaction between an accretion disc and a magnetic accretor. There is the well-known torque resulting from the difference in angular velocity between the accretion disc and the star, but in addition there is a torque coming from the interaction between the stellar magnetic field and the disc's own magnetic field. The latter form of magnetic torque decreases in strength more slowly with increasing radius, and will therefore dominate at large radii. The direction of the disc field is not determined by the difference in angular velocity between the star and the disc as in the Ghosh & Lamb model, but is rather a free parameter. The magnetic torque may therefore either spin up or spin down the star, and the torque changes sign if the magnetic field in the disc reverses. I suggest that this mechanism can explain the torque reversals that have been observed in some disc-fed X-ray pulsars.

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