Dynamo action in late-type giants

Details Dynamo action in late-type giants Dynamo action in late-type giants

2004-09-08

arxiv.org/abs/astro-ph/0409192v1

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, submitted to the proceedings of Cool Stars 13, to appear in an ESA-SP volume

Scientific paper

Recent numerical MHD simulations suggest that magnetic activity may occur in late-type giants. A entire red supergiant with stellar parameters equal to Betelgeuse was modelled in 3d with the high-order "Pencil Code". Linear kinematic and non-linear saturated dynamo action are found and the non-linear magnetic field saturates at a super-equipartition value, while in the linear regime two different modes of dynamo action are found. Magnetic activity of late-type giants, if it exists, may influence dust and wind formation and possibly lead to the heating of the outer atmospheres of these stars.

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