Dynamo action in late-type giants
Astrophysics
2007-05-23 v1
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/0409192,
title = {Dynamo action in late-type giants},
author = {S. B. F. Dorch},
journal= {arXiv preprint arXiv:astro-ph/0409192},
year = {2007}
}
Comments
4 pages, 5 figures, submitted to the proceedings of Cool Stars 13, to appear in an ESA-SP volume