Lithium abundance and activity in a sample of RS Canum Venaticorum and BY Draconis stars



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Fernández Figueroa, María José and Barrado y Navascués, D. and Castro Rubio, Elisa de and Cornide Castro-Piñeiro, Manuel (1993) Lithium abundance and activity in a sample of RS Canum Venaticorum and BY Draconis stars. Astronomy and astrophysics, 274 (2). pp. 373-380. ISSN 0004-6361

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Observations of the Li i doublet at 6707.8 angstrom for a sample of active binary systems RS CVn and By Dra have been carried out at the Calar Alto Observatory with the 2.2 m telescope. In addition, some single stars with different chromospheric activity levels have also been observed mainly for comparison purposes. Gaussian fits have been performed in order to separate the Fe I line at 6707.4 angstrom which is usually blended with the Li I doublet. Once the fit was achieved, the equivalent width was measured for each separated line. The contributions due to the continuum from both components have been taken into account to correct the equivalent width measurements. A curve-of-growth method has been used to derive lithium abundances. We have obtained a Li excess in the binary systems, in particular the K type stars. A correlation of the Li abundance with the activity levels is confirmed, as it was found by other authors, but RS CVn and BY Dra systems are 0.5 dex more active than single stars for the same Li abundance.

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© European Southern Observatory.
© 1993 EDP Sciencies.
The authors acknowlege valuable discussion with and suggestion from Roberto Pallavicini. The Calar Alto Observatory is operated jointly by the Max-Planck-Institut für Astronomie (Heidelberg) and the Spanish Comisión Nacional de Astronomía. We thank the Calar Alto staff for their help during the observations. This work has been supported in part by the Universidad Complutense de Madrid.

Uncontrolled Keywords:Main-sequence stars; Solar-type stars; F-stars; Chromospheric activity; Stellar evolution; Binary stars; Giant stars; G-dwarfs; Rotation; Hyades
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:31345
Deposited On:30 Jul 2015 11:14
Last Modified:10 Dec 2018 15:05

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