Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mast.conf...33r&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
1
Chemically Peculiar, Magnetic Fields, Observational
Scientific paper
Observed parameters of magnetic CP stars are discussed. The extreme value of the longitudinal component Bextr is shown to reflect adequately the real field on the surface of the star Bs , linear relationship between these parameters is found. Magnetic field mo dels are presented for 90 well understood MCP stars, their comparative analysis is made. It is shown that for 24 stars from the list of Landstreet and Mathys (2000) contributions of octupole component, responsible in the models of these authors for the contrast in the surface magnetic field strength between the magnetic poles and equator, differ depending on the rotational velocity. For 17 single fast rotators the magnetic field increases towards the poles in comparison with dipolar field, while for the slow rotators the indicated contrast is less than the dipolar. Such an effect is not noticed for binary stars. Relationship between rotational velocity, temperature and magnetic field for different groups of CP stars are found. The photometric indices describing the anomalies of the continuum are shown to increase inside rather narrow temperature intervals with increasing period in each of them. The magnetic field reaches the greatest value in stars with rotational periods from 5 to 10 days.
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