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Li abundances and chromospheric activity of BY Dra type stars

Published online by Cambridge University Press:  23 April 2010

Tamara V. Mishenina ,
Caroline Soubiran ,
Valery V. Kovtyukh  and
Stanislav I. Belik
Tamara V. Mishenina
Affiliation:
Université de Bordeaux - CNRS - Laboratoire d'Astrophysique de Bordeaux, BP 89, 33271 Floirac Cedex, France, email: caroline.soubiran@obs.u-bordeaux1.fr Astronomical observatory, Odessa National University, T.G.Shevchenko Park, Odessa 65014Ukraine email: tamar@deneb1.odessa.ua
Caroline Soubiran
Affiliation:
Université de Bordeaux - CNRS - Laboratoire d'Astrophysique de Bordeaux, BP 89, 33271 Floirac Cedex, France, email: caroline.soubiran@obs.u-bordeaux1.fr
Valery V. Kovtyukh
Affiliation:
Astronomical observatory, Odessa National University, T.G.Shevchenko Park, Odessa 65014Ukraine email: tamar@deneb1.odessa.ua
Stanislav I. Belik
Affiliation:
Astronomical observatory, Odessa National University, T.G.Shevchenko Park, Odessa 65014Ukraine email: tamar@deneb1.odessa.ua
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Abstract

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Atmospheric parameters and Li abundances have been determined for 162 stars observed at high resolution, high signal to noise ratio with the ELODIE echelle spectrograph (OHP, France). Among them, about 70 stars are active stars with a large fraction of BY Dra type stars. For all stars, rotational velocities were obtained with a calibration of the cross-correlation function, effective temperatures by the line depth ratio method, surface gravities by the parallaxe method and by the ionization balance of iron. The frequency of stars with observed lithium is significantly higher in active stars than in non active stars. Among active stars, no clear correlation has been found between different indicators of activity for our sample stars, but some correlation of an index R′H K and vsini is observed.

Keywords

Stars: abundancesfundamental parametersactivity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 343 - 344
Copyright
Copyright © International Astronomical Union 2010

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