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Chemical composition of photospheres in RS CVn stars

Published online by Cambridge University Press:  18 July 2013

G. Tautvaišienė ,
G. Barisevičius ,
S. Berdyugina ,
I. Ilyin  and
Y. Chorniy
G. Tautvaišienė
Affiliation:
Institute of Theoretical Physics and Astronomy, Vilnius University, Goštauto 12, LT-01108 Vilnius, Lithuania email: grazina.tautvaisiene@tfai.vu.lt
G. Barisevičius
Affiliation:
Institute of Theoretical Physics and Astronomy, Vilnius University, Goštauto 12, LT-01108 Vilnius, Lithuania email: grazina.tautvaisiene@tfai.vu.lt
S. Berdyugina
Affiliation:
Kiepenheuer Institut für Sonnenphysik, Schöneckstr 6, D-79104 Freiburg, Germany email: sveta@kis.uni-freiburg.de
I. Ilyin
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany email: ilyin@aip.de
Y. Chorniy
Affiliation:
Institute of Theoretical Physics and Astronomy, Vilnius University, Goštauto 12, LT-01108 Vilnius, Lithuania email: grazina.tautvaisiene@tfai.vu.lt
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Abstract

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In order to investigate how magnetic activity influences a stellar evolution, we undertake a detailed study of photospheric abundances in a sample of RS CVn stars. Using the Nordic Optical Telescope we investigate abundances of more than 20 chemical elements, including carbon isotopes, nitrogen and other mixing-sensitive species. In this presentation we report on current results of the analysis, among which there are first evidences that extra-mixing processes may start acting in low-mass chromospherically active stars below a bump of the luminosity function of red giants.

Keywords

Stars: abundancesstars: evolutionstars: magnetic fields

References

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