High resolution spectroscopy of recently discovered chromospherically active binary stars

Details High resolution spectroscopy of recently discovered chromospherically active binary stars High resolution spectroscopy of recently discovered chromospherically active binary stars

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.560..567g&link_type=abstract

Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, held 5-9 July, 2004 in Hamburg, Germany.

Physics

Stars: Activity, Stars: Chromospheres, Binaries: Chromospheres

Scientific paper

During last years (1999-2004) we have carried out a spectroscopic survey of young single late-type active stars possible members of young stellar kinematic groups, in order to study the kinematic and spectroscopic properties of these groups of stars. One of the results of this survey is the detection of a set of active stars showing noticeable radial velocity variations. Multiwavelength optical observations have allowed us to determine precise radial velocities by cross correlation with radial velocity standard and then to confirm or dismiss the binarity. In addition, we have obtained information about orbital solution and about the activity of the chromosphere of these active binary systems using the information provided for several optical spectroscopic features (from the Ca II H & K to Ca II IRT lines) that are formed at different heights in the chromosphere. The chromospheric contribution in these lines has been determined using the spectral subtraction technique. Rotational velocities (vsini) and lithium (Li I λ 6707.8) equivalent widths were determined too. In this contribution we have made an exhaustive study of two spectroscopic binary systems, BD+11 2052A and BD+39 2587 with are both members of a visual binary. We have obtained an orbital solution, with a high eccentricity for both systems and studied the chromosphere emission.

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