Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-03
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Space Science Reviews. Presented at the World Space Environment Forum 2005, Austria. 8 pages, 2 fi
Scientific paper
10.1007/s11214-006-7286-z
Cool giant and supergiant stars generally present low velocity winds with high mass loss rates. Several models have been proposed to explain the acceleration process of these winds. Although dust is known to be present in these objects, the radiation pressure on these particles is uneffective in reproducing the observed physical parameters of the wind. The most promising acceleration mechanism cited in the literature is the transference of momentum and energy from Alfven waves to the gas. Usually, these models consider the wind to be isothermal. We present a stellar wind model in which the Alfven waves are used as the main acceleration mechanism, and determine the temperature profile by solving the energy equation taking into account both the radiative losses and the wave heating. We also determine self-consistently the magnetic field geometry as the result of the competition between the magnetic field and the thermal pressures gradient. As main result, we show that the magnetic geometry present a super-radial index in the region where the gas pressure is increasing. However, this super-radial index is greater than that observed for the solar corona.
Falceta-Goncalves Diego
Jatenco-Pereira Vera
Vidotto Aline A.
No associations
LandOfFree
A self-consistent determination of the temperature profile and the magnetic field geometry in winds of late-type stars 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 A self-consistent determination of the temperature profile and the magnetic field geometry in winds of late-type stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A self-consistent determination of the temperature profile and the magnetic field geometry in winds of late-type stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-117823