The Magnetised Bellows of Betelgeuse

Abstract

We present calculations for a magnetised hybrid wind model for Betelegeuse ($\alpha -$Orionis). The model is a direct application of our previously derived theory, combining a canonical Weber-Davis (WD) stellar wind with dust grains in the envelope of an AGB star \citep[see][]{Thirumalai2010}. The resulting hybrid picture provides a mechanism for solving the problem of lifting stellar material up from the photosphere \citep[e.g.][] {Harper2009,Guandalini2006,Jura1984} 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 \citep[see][]{Auriere2010}, 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.

13 pages, 4 figures

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• ALMA-resolved salt emission traces the chemical footprint and inner wind morphology of VY CMa
• Magnetic field in IRC+10216 and other C-Rich Evolved Stars
• The past and future evolution of a star like Betelgeuse
• VLTI-PIONIER imaging of the red supergiant V602 Carinae
• Is Mira a magneto-dusty rotator?