| Issue |
A&A
Volume 509, January 2010
|
|
|---|---|---|
| Article Number | A45 | |
| Number of page(s) | 8 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/200912875 | |
| Published online | 15 January 2010 | |
The structure of thin accretion discs around magnetised stars
1
Department of Physics, Addis Ababa University,
PO Box 1176, Addis Ababa, Ethiopia e-mail: newtonsolbel@yahoo.com
2
Department of Physics, University of Gothenburg, SE 412 96 Gothenburg, Sweden e-mail: torkel@physics.gu.se
Received:
13
July
2009
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.