Dynamics of the envelopes of Be stars in the equatorial plane. II - The influence of a weak magnetic field on the azimuthal motion of a slowly expanding wind

Details Dynamics of the envelopes of Be stars in the equatorial plane. II - The influence of a weak magnetic field on the azimuthal motion of a slowly expanding wind Dynamics of the envelopes of Be stars in the equatorial plane. II - The influence of a weak magnetic field on the azimuthal motion of a slowly expanding wind

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..242c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 242-248.

Astronomy and Astrophysics

Astrophysics

6

B Stars, Emission Spectra, Radial Velocity, Stellar Envelopes, Stellar Magnetic Fields, Stellar Rotation, Angular Momentum, H Alpha Line, Momentum Transfer, Stellar Models, Stellar Winds

Scientific paper

We have investigated how a weak radial magnetic field influences the dynamics in the equatorial plane of the envelopes of Be stars. We calculate the distributions of the azimuthal velocity and the azimuthal magnetic field for models with various mass-loss rates, radial velocity distributions, and strengths of the radial component of the magnetic field at the surface of the star. Our investigation has shown that, in a slowly expanding envelope, a weak magnetic field can influence the rotational velocity distribution quite effectively by transferring angular momentum from the magnetic field to the material. The radial component of the magnetic force is negligible for the strength of the magnetic field considered. But the centrifugal force is enhanced as the result of the increase of rotational velocity. For some cases the centrifugal force is so large that it can counterbalance gravity.

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