Winds from Luminous Late-Type Stars. I. The Effects of Nonlinear Alfvén Waves

Details Winds from Luminous Late-Type Stars. I. The Effects of Nonlinear Alfvén Waves Winds from Luminous Late-Type Stars. I. The Effects of Nonlinear Alfvén Waves

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...528..965a&link_type=abstract

The Astrophysical Journal, Volume 528, Issue 2, pp. 965-971.

Astronomy and Astrophysics

Astronomy

20

Magnetohydrodynamics: Mhd, Stars: Individual: Constellation Name: &Alpha, Orionis, Stars: Winds, Outflows, Stars: Supergiants, Waves

Scientific paper

We present the results of magnetohydrodynamic (MHD) modeling of winds from luminous late-type stars using a 2.5-dimensional, nonlinear MHD computer code. We assume that the wind is generated within an initially hydrostatic atmosphere and is driven by torsional Alfvén waves generated at the stellar surface. Two cases of atmospheric topology are considered: case I has longitudinally uniform density distribution and isotropic radial magnetic field over the stellar surface, and case II has an isotropic, radial magnetic field with a transverse density gradient, which we refer to as an ``atmospheric hole.'' We use the same set of boundary conditions for both models.The calculations are designed to model a cool luminous star, for which we assume an initial hydrostatic pressure scale height of 0.072 R*, an Alfvén wave speed of 92 km s-1 at the surface, and a wave period of 76 days, which roughly corresponds with the convective turnover time. For case I the calculations produce a wind with terminal velocity of ~22 km s-1 and a mass loss rate comparable to the expected value of 10-6 Msolar yr-1. For case II we predict a two-component wind: a fast (25 km s-1) and relatively dense wind outside of the atmospheric hole and a slow (15 km s-1), rarefied wind inside of the hole.

Affiliated with

Also associated with

No associations

Rating

Winds from Luminous Late-Type Stars. I. The Effects of Nonlinear Alfvén Waves 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 Winds from Luminous Late-Type Stars. I. The Effects of Nonlinear Alfvén Waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Winds from Luminous Late-Type Stars. I. The Effects of Nonlinear Alfvén Waves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1253181