文章基本信息

标题：Glimpses of stellar surfaces - I. Spot evolution and differential rotation of the planet host star Kepler-210
其他标题：I. Spot evolution and differential rotation of the planet host star Kepler-210
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作者：P. Ioannidis ; P. Ioannidis ; J. H. M. M. Schmitt 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2016
卷号：594
页码：1-7
DOI：10.1051/0004-6361/201628491
语种：English
出版社：EDP Sciences
摘要：We use high accuracy photometric data obtained with the Kepler satellite to monitor the activity modulations of the Kepler-210 planet host star over a time span of more than four years. Following the phenomenology of the star’s light curve in combination with a five spot model, we identify six different so-called spot seasons. A characteristic, which is common in the majority of the seasons, is the persistent appearance of spots in a specific range of longitudes on the stellar surface. The most prominent period of the observed activity modulations is different for each season and appears to evolve following a specific pattern, resembling the changes in the sunspot periods during the solar magnetic cycle. Under the hypothesis that the star exhibits solar-like differential rotation, we suggest differential rotation values of Kepler-210 that are similar to or smaller than that of the Sun. Finally, we estimate spot life times between ~60 days and ~90 days, taking into consideration the evolution of the total covered stellar surface computed from our model.
关键词：stars: activity;starspots;stars: rotation