Impact of a Large-Scale Magnetic Field on Stellar Structure

Details Impact of a Large-Scale Magnetic Field on Stellar Structure Impact of a Large-Scale Magnetic Field on Stellar Structure

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1121...55d&link_type=abstract

SPACE PLASMA PHYSICS: School of Space Plasma Physics. AIP Conference Proceedings, Volume 1121, pp. 55-60 (2009).

Physics

Plasma Physics

Black Holes, Acoustic Gravity Waves, Tides, And Compressional Waves, Normal Galaxies, Extragalactic Objects And Systems

Scientific paper

We present the derivation of non force-free magneto-hydrostatic (MHS) equilibria in spherical geometry, supposing any prescription for the toroidal current. This allows us to study the influence on the stellar structure of a large-scale magnetic field, both on the mechanical and on the energetical balances. Two cases illustrate this approach: (i) the field is buried below a given radius, in order to model deep fossil magnetic fields in solar-like stars; (ii) the internal field matches at the surface with an external potential magnetic field that corresponds to fossil fields in more massive stars. The stellar structure perturbations are semi-analytically computed in both cases. This allows us to establish a hierarchy between the orders of magnitude of the different terms. Finally, the limit of validity of the linear perturbation is discussed.

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