Dynamos and Chemical Mixing in Evolved Stars

Details Dynamos and Chemical Mixing in Evolved Stars Dynamos and Chemical Mixing in Evolved Stars

2007-12-14

arxiv.org/abs/0712.2369v1

AIPConf.Proc.1001:306-312,2008

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures. To appear in AIP Proceedings of the IXth Torino Workshop on AGB Nucleosynthesis

Scientific paper

10.1063/1.2916979

In low-mass Red Giant Branch (RGB) and Asymptotic Giant Branch (AGB) stars, anomalous mixing must transport material near the hydrogen-burning shell to the convective envelope. Recently, it was suggested that buoyant magnetic flux tubes could supply the necessary transport rate (Busso et al. 2007). The fields are assumed to originate from a dynamo operating in the stellar interior. Here, we show what is required of an $\alpha-\Omega$ dynamo in the envelope of an AGB star to maintain these fields. Differential rotation and rotation drain via turbulent dissipation and Poynting flux, so if shear can be resupplied by convection, then large-scale toroidal field strengths of $\left\simeq3\times10^4$ G can be sustained at the base of the convection zone.

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