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

Zsolt Kővári, János Bartus, Levente Kriskovics, Katalin Oláh, Krisztián Vida, Orsolya Ribárik, Klaus G. Strassmeier
2011 Proceedings of the International Astronomical Union  
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
more » ... Doppler images. We also aim at understanding how differential rotation could be affected by tidal forces in such close binaries.
doi:10.1017/s1743921311027335 fatcat:fiwurnw3cja2rns2pu52szvfp4