活动K巨星$σ$ Geminorum上具有反太阳差异转动的表面速度网络
Surface velocity network with anti-solar differential rotation on the active K-giant $σ$ Geminorum
摘要：
我们首次展示了恒星数据的本地相关跟踪技术的力量。我们恢复点迁移模式的长周期RS CVn型二进制$σ$宝石从一组6个多普勒图像从3.6个连续的旋转周期。由此产生的表面流图表明，一个弱的反太阳的差异旋转与$α\approx-0.0022\pm0.0016$，和一致的极向点迁移的平均速度为$220\pm10$ m s $^{-1}$。这一结果与我们最近的另一项研究结果一致，也可以从理论上得到证实。
英文摘要：
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 $σ$ 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 $α\approx-0.0022\pm0.0016$, 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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