On dynamos in the cores of magnetic stars

Details On dynamos in the cores of magnetic stars On dynamos in the cores of magnetic stars

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..319m&link_type=abstract

Astronomy and Astrophysics, vol. 91, no. 3, Nov. 1980, p. 319-321.

Physics

11

Dynamo Theory, Magnetic Stars, Stellar Magnetic Fields, Stellar Structure, Field Theory (Physics), Turbulence Effects

Scientific paper

It is suggested that if the core dynamo model for the fields of the observably magnetic stars is valid, then if the field generated in the core is 'large' (up to local equipartition values with the turbulence, perhaps 100,000 or 1,000,000 G or even somewhat larger), then this field may not be able to produce an observable surface field unless the dynamo field does not oscillate or the period of oscillation is at most comparable with the stellar life (for the chosen stellar parameters). It is concluded that oscillatory dynamos will not produce observable fields since the time scales associated with dynamical and magnetic processes (with the enhanced turbulent diffusivity) in the core, although somewhat uncertain, are certainly very small compared with the stellar lifetime.

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