Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mast.conf...19s&link_type=abstract
Magnetic stars, Proceedings of the International Conference, held in the Special Astrophysical Observatory of the Russian AS, Au
Astronomy and Astrophysics
Astrophysics
2
Chemically Peculiar, Magnetic Fields, Rotation, Fundamental Parameters
Scientific paper
Two main properties distinguishing BpAp magnetic stars from normal stars of the same mass, i. e. slow rotation and the presence of large-scale surface magnetic field, are discussed. It is shown that the angular velocity distribution of periodically variable BpAp stars is exponential, unlike that of normal or rapidly rotating Be stars. Periodicity is observed in stars lying everywhere between ZAMS and TAMS, which indicates that slow rotation and surface nonuniformities (usually associated with the presence of the magnetic field) are developed early in the stellar life. Similar analysis of stars with detected magnetic fields confirms this conclusion. The analyzed data did not allow carrying out a reliable discussion of any possible variability of the rotation rate or magnetic field across the MS. A mechanism of angular momentum evolution of a magnetic star at the PMS phase is presented. The mechanism explains slow rotation of stars with a strong magnetic field and a rapid rotation of Be stars, assuming that the latter possess weak magnetic fields. Recent detections of such fields in two Be stars support this assumption. The discussed mechanism can also explain the observed prop erties of extremely slowly rotating BpAp stars.
Arguments are given for survival of the fossil magnetic fields at evolutionary phases beyond the MS.
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