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On MHD rotational transport, instabilities and dynamo action in stellar radiation zones

Published online by Cambridge University Press:  01 April 2008

S. Mathis ,
J.-P. Zahn  and
A.-S. Brun
S. Mathis
Affiliation:
Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/SAp, F-91191 Gif-sur-Yvette Cedex, France email: stephane.mathis@cea.fr, allan-sacha.brun@cea.fr LUTH, Observatoire de Paris-CNRS-Université Paris Diderot, 5 Place Jules Janssen, F-92195 Meudon Cedex, France email: jean-paul.zahn@obspm.fr
J.-P. Zahn
Affiliation:
LUTH, Observatoire de Paris-CNRS-Université Paris Diderot, 5 Place Jules Janssen, F-92195 Meudon Cedex, France email: jean-paul.zahn@obspm.fr
A.-S. Brun
Affiliation:
Laboratoire AIM, CEA/DSM-CNRS-Université Paris Diderot, IRFU/SAp, F-91191 Gif-sur-Yvette Cedex, France email: stephane.mathis@cea.fr, allan-sacha.brun@cea.fr LUTH, Observatoire de Paris-CNRS-Université Paris Diderot, 5 Place Jules Janssen, F-92195 Meudon Cedex, France email: jean-paul.zahn@obspm.fr
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Abstract

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Magnetic field is an essential dynamical process in stellar radiation zones. Moreover, it has been suggested that a dynamo action, sustained by a MHD instability which affects the toroidal axisymmetric magnetic field, could lead to a strong transport of angular momentum and of chemicals in such regions. Here, we recall the different magnetic transport and mixing processes in radiative regions. Next, we show that the dynamo cannot operate as described by Spruit (2002) and recall the condition required to close the dynamo loop. We perform high-resolution 3D simulations with the ASH code, where we observe indeed the MHD instability, but where we do not detect any dynamo action, contrary to J. Braithwaite (2006). We conclude on the picture we get for magnetic transport mechanisms in radiation zones and the associated consequences for stellar evolution.

Keywords

MHDSun: magnetic fieldsSun: interiorstars: magnetic fieldsstars: interiors
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S252: The Art of Modeling Stars in the 21st Century , April 2008 , pp. 255 - 256
Copyright
Copyright © International Astronomical Union 2008

References

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Zahn, J.-P., Brun, A.-S., & Mathis, S. 2007, A&A 474, 145Google Scholar