Journal Article

The magnetized bellows of Betelgeuse

Anand Thirumalai and Jeremy S. Heyl

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 2, pages 1272-1282
Published in print May 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20703.x
The magnetized bellows of Betelgeuse

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We present calculations for a magnetized hybrid wind model for Betelegeuse ( Orionis). The model is a direct application of our previously derived theory, combining a canonical Weber–Davis stellar wind with dust grains in the envelope of an asymptotic giant branch star. The resulting hybrid picture provides a mechanism for solving the problem of lifting stellar material up from the photosphere and into the circumstellar envelope. It also predicts wind velocities in agreement with current estimates. Our approach reveals that magnetic fields in supergiant stars like Betelgeuse may play a vital role in determining the nature of the stellar outflow and consequently opens a new avenue of investigation in the field of hybrid stellar winds.

Keywords: MHD; stars: AGB and post-AGB; stars: winds, outflows

Journal Article.  11146 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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