Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...524..159g&link_type=abstract
The Astrophysical Journal, Volume 524, Issue 1, pp. 159-168.
Astronomy and Astrophysics
Astronomy
62
Accretion, Accretion Disks, Ism: Jets And Outflows, Methods: Numerical, Magnetohydrodynamics: Mhd, Stars: Magnetic Fields, Stars: Pre-Main-Sequence
Scientific paper
This paper addresses the physical principles underpinning a new jet-launching mechanism described in a companion paper. In this new jet formation model, magnetic loops that connect the star to the disk become twisted and expand via helicity injection. This expansion drives an outflow, with the axial symmetry of the disk leading to a concentration of outflowing plasma along the rotation axis, forming the jet. In the companion paper, it is found that the radial location of the inner edge of the disk undergoes oscillations. In this paper, the physical causes of the disk oscillations are investigated. This investigation leads to the conclusion that there are three classes of flows that can arise, depending on the role of diffusive instabilities. The most diffusive flows allow the stellar magnetic field to slip through the accretion disk and yield steady accretion flows. Such configurations are unlikely to produce outflows. The flows with intermediate diffusivity have been described by Lovelace, Romanova, & Bisnovatyi-Kogan and represent conditions in which the field is effectively frozen into the accretion disk azimuthally but slips radially. In the absence of magnetic reconnection, such configurations are predicted to produce steady flows with logarithmically collimated disk winds. The least diffusive flows, in which the bulk radial disk velocities are greater at times than the speeds with which magnetic field lines can diffuse into the disks, lead to the formation of the collimated unsteady jets described in the companion paper and are the primary interest of this paper. The jet velocity is also addressed.
Goodson Anthony P.
Winglee Robert M.
No associations
LandOfFree
Jets from Accreting Magnetic Young Stellar Objects. II. Mechanism Physics 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 Jets from Accreting Magnetic Young Stellar Objects. II. Mechanism Physics, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Jets from Accreting Magnetic Young Stellar Objects. II. Mechanism Physics will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1083864