Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305..140m&link_type=abstract
Astronomy and Astrophysics, v.305, p.140
Astronomy and Astrophysics
Astrophysics
5
Mhd, Stars: Magnetic Fields, Stars: Pre-Main Sequence
Scientific paper
As stars of low or moderate mass contract towards the main sequence, there may be a time when a convectively unstable region is threaded by a large scale relic field, trapped from the interstellar medium during the star formation process. If the convection zone supports a dynamo, then the interaction of such a relic field with the dynamo is of interest. Thus mean field dynamo models are studied in the presence of an imposed background field. For most of the investigation, an alpha-quenching nonlinearity is assumed. It is then shown that, when differential rotation is present, the total field energy is less than that of the relic field alone, lying between this value and that of the dynamo with no imposed field, except when the imposed field strength is small. However, if the field strength is limited at finite amplitude by a magnetic buoyancy mechanism, the situation is somewhat less clear cut, and modest enhancement of the total field energy above the level of the pure relic field (itself modified by the buoyancy) may then be possible for some parameter values.
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