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arXiv 2005.08688astro-ph.SR
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M矮星的转动-活度关系:从K2到TESS和PLATO

The rotation-activity relation of M dwarfs: From K2 to TESS and PLATO

St. Raetz, B. Stelzer, A. Scholz

摘要:

晚型恒星自转-活动关系的研究对于加深我们对恒星发电机和角动量演化的理解是必不可少的。我们研究的旋转活动与K2的M矮星,它是特别少了解的关系。我们分析了所有明亮的和附近的M矮星的光变曲线,形成Superblink自行目录,在K2的视野。对于在长节奏模式下在C0-C19活动中观察到的430 M矮星样本,我们确定了旋转周期和丰富的活动诊断。我们的研究的基础上的光度活动指标的旋转活动关系证实了先前发表的突变的活动水平在旋转周期约10天。我们三倍多的样本增加了这一发现的统计意义。

英文摘要:

Studies of the rotation-activity relation of late-type stars are essential to enhance our understanding of stellar dynamos and angular momentum evolution. We study the rotation-activity relation with K2 for M dwarfs where it is especially poorly understood. We analyzed the light curves of all bright and nearby M dwarfs form the Superblink proper motion catalog that were in the K2 field of view. For a sample of 430 M dwarfs observed in campaigns C0-C19 in long cadence mode we determined the rotation period and a wealth of activity diagnostics. Our study of the rotation-activity relation based on photometric activity indicators confirmed the previously published abrupt change of the activity level at a rotation period of ~10d. Our more than three times larger sample increases the statistical significance of this finding.

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