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Impact of large-scale magnetic fields on stellar structure and evolution

Published online by Cambridge University Press:  01 November 2008

Vincent Duez ,
S. Mathis ,
A. S. Brun  and
S. Turck-Chièze
Vincent Duez
Affiliation:
DSM/IRFU/SAp, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France; AIM, UMR 7158, CEA - CNRS - Université Paris 7, France email: vincent.duez@cea.fr
S. Mathis
Affiliation:
DSM/IRFU/SAp, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France; AIM, UMR 7158, CEA - CNRS - Université Paris 7, France email: vincent.duez@cea.fr
A. S. Brun
Affiliation:
DSM/IRFU/SAp, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France; AIM, UMR 7158, CEA - CNRS - Université Paris 7, France email: vincent.duez@cea.fr
S. Turck-Chièze
Affiliation:
DSM/IRFU/SAp, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France; AIM, UMR 7158, CEA - CNRS - Université Paris 7, France email: vincent.duez@cea.fr
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Abstract

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We study the impact on the stellar structure of a large-scale magnetic field in stellar radiation zones. The field is in magneto-hydrostatic (MHS) equilibrium and has a non force-free character, which allows us to study its influence both on the mechanical and and on the energetic balances. This approach is illustrated in the case of an Ap star where the magnetic field matches at the surface with an external potential one. Perturbations of the stellar structure are semi-analytically computed. The relative importance of the magnetic physical quantities is discussed and a hierarchy, aiming at distinguishing various refinement degrees in the implementation of a large-scale magnetic field in a stellar evolution code, is established. This treatment also allows us to deduce the gravitational multipolar moments and the change in effective temperature associated with the presence of a magnetic field.

Keywords

Stars: interiors – stars: magnetic fields – stars: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 177 - 184
Copyright
Copyright © International Astronomical Union 2009

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