Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012an....333...41k&link_type=abstract
Astronomische Nachrichten, Vol.333, Issue 1, p.41
Astronomy and Astrophysics
Astronomy
Stars: Atmospheres, Stars: Chemically Peculiar, Stars: Magnetic Fields, Techniques: Polarimetric
Scientific paper
We present the results of measurements of magnetic fields of chemically peculiar (CP) stars, performed from the shifts between the circularly polarized components of metal and hydrogen lines (the Babcock method). The observations are carried out with an analyzer of circular polarization at the 6-m telescope of the SAO RAS. We found that for the absolute majority of the objects studied (in 22 CP stars out of 23), the magnetic fields, determined from the Zeeman shifts in the hydrogen line cores, are significantly lower than those obtained from metal lines in the same spectra. This disparity varies between the stars. We show that instrumental effects can not produce the above features, and discuss the possible causes of the observed effect. The discovered condition reveals a more complicated structure of magnetic fields of CP stars than a simple dipole, in particular, a reduction of the field strength in the upper atmosphere with the vertical gradient, significantly higher than the dipole.
This paper is based on data obtained at the Russian 6-m telescope.
Kudryavtsev Dmitry O.
Romanyuk Iosif I.
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