Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...688.1320b&link_type=abstract
The Astrophysical Journal, Volume 688, Issue 2, pp. 1320-1325.
Astronomy and Astrophysics
Astronomy
10
Stars: Circumstellar Matter, Stars: Early-Type, Stars: Emission-Line, Be, Stars: Magnetic Fields, Stars: Rotation, Stars: Winds, Outflows
Scientific paper
The puzzle of the origin of Be star disks is discussed. Contrary to recently published claims, it is argued that the magnetically torqued disk (MTD) type models of Cassinelli et al. offer a viable scenario for a successful model with all the key ingredients. MTD models involve disk compression by equatorial collision of stellar wind streams that are steered and torqued by a dipole-like magnetic field. While the growing disk density tends to lead to the gas breaking out centrifugally from the field, it is proposed that the onset of viscous effects can lead to an eventual stable, slowly outflowing, Keplerian disk. It is then shown that the resulting very dense (wind compressed) disk need have only a very slow subsonic outflow to satisfy mass continuity. Consequently, line profile data do not preclude steadily expanding disks of high density. It is also shown that the time taken to reach the steady state would typically be of the order of 104 wind flow times R/v∞. This is far longer than the run times of recent numerical MHD simulations that displayed bursty breakout behavior, which may therefore only be transients induced by unrealistic initial conditions.
Brown John C.
Cassinelli Joe P.
Maheswaran Murugesapillai
No associations
LandOfFree
Magnetically Fed Hot Star Keplerian Disks with Slow Outflow 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 Magnetically Fed Hot Star Keplerian Disks with Slow Outflow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetically Fed Hot Star Keplerian Disks with Slow Outflow will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1102159