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Hans Publishers, Astronomy & Astrophysics, 1(474), p. 165-168

DOI: 10.1051/0004-6361:20078039

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Anti-solar differential rotation on the active K-giant $\mathsf{\sigma}$ Geminorum

Journal article published in 2007 by Z.-S. Kővári ORCID, J. Bartus, K. G. Strassmeier, K. Vida, M. Švanda, K. Oláh
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Preprint: archiving forbidden
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Postprint: archiving forbidden
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Abstract

The active K1 giant sigma Gem and its differential surface rotation is revisited. We refine our previous inconclusive result by recovering the spot migration pattern of this long-period RS CVn-type binary through application of the technique of ``average cross-correlation of contiguous Doppler images'' to a set of six Doppler images from 3.6 consecutive rotation cycles. We find an anti-solar differential rotation law with a shear of alpha≈ -0.022±0.006. We also find evidence of a poleward migration trend of spots with an average velocity of ≈300 m s-1.