The magnetic field and the evolution of element spots on the surface of the HgMn eclipsing binary ARAur

Details The magnetic field and the evolution of element spots on the surface of the HgMn eclipsing binary ARAur The magnetic field and the evolution of element spots on the surface of the HgMn eclipsing binary ARAur

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.408l..61h&link_type=abstract

Monthly Notices of the Royal Astronomical Society: Letters, Volume 408, Issue 1, pp. L61-L65.

Astronomy and Astrophysics

Astronomy

9

Stars: Abundances, Binaries: Eclipsing, Binaries: Spectroscopic, Stars: Chemically Peculiar, Stars: Individual: Araur, Stars: Magnetic Field

Scientific paper

The system ARAur is a young late B-type double-lined eclipsing binary with a primary star of HgMn peculiarity. We applied the Doppler imaging method to reconstruct the distribution of Fe and Y over the surface of the primary using spectroscopic time series obtained in 2005 and from 2008 October to 2009 February. The results show a remarkable evolution of the element distribution and overabundances. Measurements of the magnetic field with the moment technique using several elements reveal the presence of a longitudinal magnetic field of the order of a few hundred gauss in both stellar components and a quadratic field of the order of 8kG on the surface of the primary star.
Based on observations obtained at the 2.56-m Nordic Optical Telescope on La Palma, the Karl-Schwarzschild-Observatorium in Tautenburg and the STELLA robotic telescope on Tenerife.
E-mail: shubrig@aip.de

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