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The Influence of Binarity on Stellar Activity

Published online by Cambridge University Press:  12 July 2007

Katalin Oláh
Katalin Oláh*
Affiliation:
Konkoly Observatory, 1525 Budapest, P.O. Box 67, Hungary email: olah@konkoly.hu
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Abstract

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Activity of late type stars is enhanced by fast rotation, which is maintained in nearly synchronized close binary systems. Magnetic activity originates in the deep convection zones of stars from where magnetic flux tubes emerge to their surfaces. The gravitational forces in binaries help the clustering of activity features giving rise to active longitudes. These preferred longitudes are observed in binaries from dwarfs to giants. Differential rotation is found in many active stars that are components of binary systems. If these binaries are circularized and nearly synchronized, then there will be a corotation latitude in their surfaces, and its position can be determined by observations and by theoretical calculations. Enhanced activity in binaries could have a reverse effect as well: strong magnetism in a binary component can modify the orbital period by the cyclic exchange of kinetic and magnetic energy in its convective envelope.

Keywords

stars: spots – stars: activity – stars: atmospheres – stars: late-type – stars: magnetic fields – stars: binaries: close
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S240: Binary Stars as Critical Tools & Tests in Contemporary Astrophysics , August 2006 , pp. 442 - 452
Copyright
Copyright © International Astronomical Union 2007

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