Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..748w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 292, p. 748
Astronomy and Astrophysics
Astronomy
24
B Stars, Stellar Rotation, Peculiar Stars, Stellar Magnetic Fields, Magnetic Field Configurations, Stellar Models, Line Of Sight, Astronomical Photometry, Magnetic Dipoles
Scientific paper
We present a model of the magnetic field geometry of the Bp star HD 200311 based upon new mean longitudinal magnetic field measurements and previously published mean magnetic field modulus measurements by Mathys et al. (1997). This is the fourth in a series of papers aimed at constructing magnetic field models for peculiar stars throughout the F0-B2 temperature range. The 21 longitudinal magnetic field measurements indicate the presence of a strong and variable line-of-sight magnetic field. These data do not define a smooth curve of variation when phased with the 26.0042-d period found by Adelman (1997) from Stromgren photometry. However, when phased with a period of 52.0084 d (twice Adelman's period), the longitudinal field data define a sinusoidal curve with extrema of - 1.8 and + 1.8 kG. The mean magnetic field modulus measurements describe an approximately sinusoidal curve when phased with this same period. Adelman's photometry, when phased with this period, describes a double-wave variation with approximately equal maxima, one of which occurs close in phase to the longitudinal field maximum. This is consistent with an inhomogeneous chemical abundance distribution that is symmetric about the magnetic field axis, and similar in both magnetic hemispheres. The phased magnetic field data have been modelled assuming an oblique decentered magnetic dipole.
Elkin V. G.
Landstreet John Darlington
Romanyuk Iosif I.
Wade Gregg A.
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