HD 45583—a chemically peculiar star with an unusual curve of longitudinal magnetic field variations

Details HD 45583—a chemically peculiar star with an unusual curve of longitudinal magnetic field variations HD 45583—a chemically peculiar star with an unusual curve of longitudinal magnetic field variations

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008astbu..63..128s&link_type=abstract

Astrophysical Bulletin, Volume 63, Issue 2, pp.128-138

Astronomy and Astrophysics

Astrophysics

6

97.10.Fg, 97.30.Fi

Scientific paper

The results of a complex study of the chemically peculiar star HD 45583 are reported. Observations were made using the Main Stellar Spectrograph equipped with a circular polarization analyzer and NES echelle spectrograph of the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. Our measurements of Zeeman spectra show that the star exhibits unusual variations of the longitudinal component of magnetic field with a secondary minimum. The period of spectral and magnetic variability coincides with the rotation period, which is equal to 1.d177000. Two possible causes of the secondary minimum are discussed: spots with higher than ambient content of some chemical elements on the star’s surface or complex structure of the stellar magnetic field. The parameters of the star’s atmosphere are determined ( T eff = 13000 K, log g = 4.0), as well as the abundances of some elements: the star shows a 1 2 dex overabundance of Fe, Si, and Cr, helium is underabundant by about 2 dex with respect to the Sun.

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