Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....38..263s&link_type=abstract
Astronomy and Astrophysics, vol. 38, no. 2, Jan. 1975, p. 263-270.
Astronomy and Astrophysics
Astrophysics
20
A Stars, Dynamo Theory, Magnetic Stars, Stellar Evolution, Stellar Magnetic Fields, Astronomical Models, Boundary Value Problems, Main Sequence Stars, Stellar Spectra
Scientific paper
The evolution of axisymmetric magnetic fields during the Hayashi-phase is investigated on the basis of the alpha-effect dynamo mechanism. In particular, the influence of the transition from the fully convective to the fully radiative main sequence state (for A stars) is considered for rigid rotation. The fields are calculated by solving the induction equation as an initial value problem. The numerical results show that a dynamo-built magnetic field can 'survive' the transition while conserving the main part of its total flux. The topology of the field can change significantly during the evolution. For a certain phase of the transition to the main sequence there are oscillating fields, possibly giving an explanation for magnetic stars with long periods.
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