Surface velocity network with anti-solar differential rotation on the active K-giant $σ$ Geminorum

Details Surface velocity network with anti-solar differential rotation on the active K-giant $σ$ Geminorum Surface velocity network with anti-solar differential rotation on the active K-giant $σ$ Geminorum

2007-11-05

arxiv.org/abs/0711.0771v1

Astronomy and Astrophysics

Astrophysics

3 pages, 3 figures, conference title: 5th Potsdam Thinkshop, accepted for publication in Astronomische Nachrichten

Scientific paper

10.1002/asna.200710874

We demonstrate the power of the local correlation tracking technique on stellar data for the first time. We recover the spot migration pattern of the long-period RS CVn-type binary $\sigma$ Gem from a set of six Doppler images from 3.6 consecutive rotation cycles. The resulting surface flow map suggests a weak anti-solar differential rotation with $\alpha\approx-0.0022\pm0.0016$, and a coherent poleward spot migration with an average velocity of $220\pm10$ m s$^{-1}$. This result agrees with our recent findings from another study and could also be confirmed theoretically.

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