The magnetic field and the evolution of element spots on the surface of the HgMn eclipsing binary ARAur
Hubrig, S. × Savanov, I. Ilyin, I. Gonzalez, J. Korhonen, H. Lehmann, H. Schoeller, M. Granzer, T. Weber, M. Strassmeier, K. Hartmann, M. Tkachenko, A. #
Priestley and Weale
Monthly Notices of the Royal Astronomical Society vol:408 issue:1 pages:L61-L65
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.