Magnetic chemically peculiar stars: Results of CCD magnetic field measurements with the 6-m telescope

Details Magnetic chemically peculiar stars: Results of CCD magnetic field measurements with the 6-m telescope Magnetic chemically peculiar stars: Results of CCD magnetic field measurements with the 6-m telescope

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011an....332..965r&link_type=abstract

Astronomische Nachrichten, Vol.332, Issue 9/10, p.965

Astronomy and Astrophysics

Astronomy

1

Magnetic Fields, Cp Stars, Spectropolarimetry

Scientific paper

We present a survey of observational data on the magnetic fields and physical parameters of chemically peculiar (CP) stars for the past 15-20 years. It appears that the traditional notions on chemically peculiar stars as very stable objects with frozen atmospheres are in need of revision. Analysis of new high-precision observational data allows to detect such subtle phenomena as pulsations of brightness and radial velocities of stars, and the vertical stratification of chemical elements in their atmospheres. A relationship was found between weak anomalies in the energy distribution in the continuum and the magnetic field strength. An analysis of the Stokes Q and U parameter line profiles of some stars has shown that these observations can be described under the assumption of the field of complex topology, which can not be represented in the form of low-order multipoles. We found large vertical gradients from lines formed at different optical depths in the stellar atmospheres. These facts indicate much more complex atmospheric structures in chemically peculiar stars than was considered only 20 years ago.

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