On the Biermann 'battery' process in uniformly rotating, chemically inhomogeneous stars

Details On the Biermann 'battery' process in uniformly rotating, chemically inhomogeneous stars On the Biermann 'battery' process in uniformly rotating, chemically inhomogeneous stars

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204..557m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, Aug. 1983, p. 557-574.

Astronomy and Astrophysics

Astronomy

20

Magnetic Field Configurations, Stellar Magnetic Fields, Stellar Structure, Helium, Peculiar Stars, Poloidal Flux, Stellar Rotation, Toroids

Scientific paper

Dolginov has pointed out that if the mean molecular weight mu in a stellar radiative zone has a nonspherical distribution, then the partial pressure gradient per electron will in general have a curl and so will act as a Biermann 'battery'. Examples of battery-maintained toroidal magnetic fields are constructed, but with the associated currents constrained to flow along the lines of a primeval poloidal field of quadrupole or displaced dipole structure. Attention is focussed on the self-consistent cases, in which the star rotates uniformly and the mu-distribution is fixed by the mutual cancellation of the Eddington-Sweet 'Omega-currents' and the 'mu-currents'. The fields are weaker than those found by Biermann in his original study of nonuniformly rotating but chemically homogeneous stars, but in rapid rotators are comparable in strength with the estimated internal poloidal field in an Ap star. Also studied are some examples of toroidal fields generated by localized abundance patches on the surfaces of Ap stars. These cases are more likely to produce strong observable toroidal fields.

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