Stable magnetic fields in stellar interiors

Details Stable magnetic fields in stellar interiors Stable magnetic fields in stellar interiors

2005-10-11

arxiv.org/abs/astro-ph/0510316v1

Astronomy and Astrophysics

Astrophysics

19 pages, 24 figures, submitted to A&A

Scientific paper

10.1051/0004-6361:20041980

We investigate the 50-year old hypothesis that the magnetic fields of the Ap stars are stable equilibria that have survived in these stars since their formation. With numerical simulations we find that stable magnetic field configurations indeed appear to exist under the conditions in the radiative interior of a star. Confirming a hypothesis by Prendergast (1956), the configurations have roughly equal poloidal and toroidal field strengths. We find that tori of such twisted fields can form as remnants of the decay of an unstable random initial field. In agreement with observations, the appearance at the surface is an approximate dipole with smaller contributions from higher multipoles, and the surface field strength can increase with the age of the star. The results of this paper were summarised by Braithwaite & Spruit (2004).

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