Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-01-19
Astrophys.J. 595 (2003) 1009-1031
Astronomy and Astrophysics
Astrophysics
26 pages, 22 figures, LaTeX, macros: emulapj.sty, avi simulations are available at http://www.astro.cornell.edu/us-rus/incline
Scientific paper
10.1086/377514
We present results of fully three-dimensional MHD simulations of disk accretion to a rotating magnetized star with its dipole moment inclined at an angle Theta to the rotation axis of the disk. We observed that matter accretes from the disk to a star in two or several streams depending on Theta. Streams may precess around the star at small Theta. The inner regions of the disk are warped. The warping is due to the tendency of matter to co-rotate with inclined magnetosphere. The accreting matter brings positive angular momentum to the (slowly rotating) star tending to spin it up. The corresponding torque N_z depends only weakly on Theta. The angular momentum flux to the star is transported predominantly by the magnetic field; the matter component contributes < 1 % of the total flux. Results of simulations are important for understanding the nature of classical T Tauri stars, cataclysmic variables, and X-ray pulsars.
Koldoba Alexander V.
Lovelace Richard V. E.
Romanova Marina M.
Ustyugova Galina V.
Wick Justin V.
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