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Differential Rotation in Two RS CVn Systems: σ Gem and ζ And

Published online by Cambridge University Press:  23 April 2012

Zsolt Kővári ,
János Bartus ,
Levente Kriskovics ,
Katalin Oláh ,
Krisztián Vida ,
Orsolya Ribárik  and
Klaus G. Strassmeier
Zsolt Kővári
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121 Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, wennot@konkoly.hu
János Bartus
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121 Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, wennot@konkoly.hu Leibniz Institute for Astrophysics Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: jbartus@aip.de, kstrassmeier@aip.de
Levente Kriskovics
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121 Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, wennot@konkoly.hu
Katalin Oláh
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121 Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, wennot@konkoly.hu
Krisztián Vida
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121 Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, wennot@konkoly.hu
Orsolya Ribárik
Affiliation:
Konkoly Observatory, Konkoly Thege út 15-17., H-1121 Budapest, Hungary email: kovari@konkoly.hu, kriskovics@konkoly.hu, olah@konkoly.hu, vida@konkoly.hu, wennot@konkoly.hu
Klaus G. Strassmeier
Affiliation:
Leibniz Institute for Astrophysics Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany email: jbartus@aip.de, kstrassmeier@aip.de
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Abstract

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The differentially rotating convective envelope is an indispensable element of the magnetic dynamo working in RS CVn-systems. Tidal coupling is responsible for maintaining fast rotation, and also the observed high level of magnetic activity. In this work, we compare the physical properties of two well known RS CVn-type binaries, that is the long-period system σ Gem and the ellipsoidal variable ζ And. For the comparison, we use the results obtained from processing time-series Doppler images. We also aim at understanding how differential rotation could be affected by tidal forces in such close binaries.

Keywords

stars: activitystars: imagingstars: individual (σ Gem, ζ And)stars: spotsstars: late-type

References

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