Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...475l.135w&link_type=abstract
Astrophysical Journal Letters v.475, p.L135
Astronomy and Astrophysics
Astronomy
13
Accretion, Accretion Disks, Stars: Magnetic Fields, Stars: Rotation
Scientific paper
Simple analytical expressions are derived for the torque exerted by an accretion disk on a star whose magnetic dipole axis is inclined to the rotation axis. Spin-down stresses are transmitted to the star by the field lines that penetrate the disk beyond the corotation radius Rc. As the dipole inclination angle chi increases, the vertical magnetic flux through the disk decreases, and the spin-down contribution to the torque weakens. For inclinations exceeding some limiting value chi c in the range of approximately 54 deg--67 deg, the braking component is unable to offset the spin-up resulting from the accretion of matter, even when the inner radius of the Keplerian disk, R0, is located very close to Rc, so that the fastness parameter omega = (R0/Rc)3/2 approaches unity. Thus, for large tilt angles, there can be no steady equilibrium state in which the net torque on the accreting star vanishes, unless some of the material is simultaneously expelled by centrifugal forces or accumulates within the disk.
No associations
LandOfFree
Torque Exerted on an Oblique Rotator by a Magnetically Threaded Accretion Disk does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Torque Exerted on an Oblique Rotator by a Magnetically Threaded Accretion Disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Torque Exerted on an Oblique Rotator by a Magnetically Threaded Accretion Disk will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1775269