Modelling magnetic activity in late-type giants
Bertil F. Dorch (The Niels Bohr Institute)
Recent evidence from numerical magneto-hydrodynamical simulations suggest that late-type giant stars may habour
magnetic fields. In a "star-in-a-box" simulation, a red supergiant with stellar parameters similar to that of Betelgeuse was found to display both linear kinematic and non-linear saturated dynamo action: the non-linear magnetic field saturates at a super-equipartition value corresponding to surface magnetic field of field strengths up to solar values. In the linear regime two different modes of dynamo action are found. It is speculated that magnetic activity of late-type giants lead to the heating of the outer atmospheres of these stars.
http://www.astro.ku.dk/~dorch