Pre-main sequence dynamos and relic magnetic fields of solar-type stars

Details Pre-main sequence dynamos and relic magnetic fields of solar-type stars Pre-main sequence dynamos and relic magnetic fields of solar-type stars

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...374..250k&link_type=abstract

Astronomy and Astrophysics, v.374, p.250-258 (2001)

Astronomy and Astrophysics

Astrophysics

25

Stars: Magnetic Fields, Stars: Rotation, Stars: Interiors, Stars: Evolution, Sun: Magnetic Fields, Mhd

Scientific paper

We argue that contemporary magnetic fields in the radiative cores of solar-type stars are relics of hydromagnetic dynamos operating over the pre-main sequence epoch when the core formed. Simulations of differential rotation and dynamos of a 1 M_sun star are performed for a sequence of evolutionary stages of the core-growth epoch. A big difference in the dynamo-generated field between the initial and final stages of the core formation is predicted. An axisymmetric and cyclic field similar to the present day Sun is excited in a star with a mature radiative zone. An infant Sun with its core just starting to grow generates a nonaxisymmetric global field which is steady in a rotating frame. A qualitative explanation for the nonaxisymmetry is suggested. A model for the field capturing by the growing core is designed. The internal field is most efficiently captured over the initial phase when the core grows most rapidly. A nonaxisymmetric global relic field with an amplitude somewhat below 1 G is predicted for a main-sequence star of solar mass. An interpretation of the active longitude phenomenon as observed on the Sun and stars in terms of the nonaxisymmetric relic field is suggested.

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