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. F.; KORHONEN, H.; LEHMANN, H.; SCHÖLLER, M.; GRANZER, T.; WEBER, M.; STRASSMEIER, K. G.; HACKMAN, T.; TKACHENKO, A.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2010 vol. 408 p. 61 - 65

0035-8711

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.