Anti-solar differential rotation on the active K-giant σ Geminorum

Details Anti-solar differential rotation on the active K-giant σ Geminorum Anti-solar differential rotation on the active K-giant σ Geminorum

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...474..165k&link_type=abstract

Astronomy and Astrophysics, Volume 474, Issue 1, October IV 2007, pp.165-168

Astronomy and Astrophysics

Astrophysics

8

Stars: Activity, Stars: Imaging, Stars: Late-Type, Stars: Starspots, Stars: Individual: Σ Geminorum

Scientific paper

The active K1 giant σ 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 α≈ -0.022±0.006. We also find evidence of a poleward migration trend of spots with an average velocity of ≈300 m s-1.

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