文章基本信息

标题：Magnetic activity of the solar-like star HD 140538
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作者：M. Mittag ; J. H. M. M. Schmitt ; T. S. Metcalfe 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2019
卷号：628
页码：1-6
DOI：10.1051/0004-6361/201935654
语种：English
出版社：EDP Sciences
摘要：The periods of rotation and activity cycles are among the most important properties of the magnetic dynamo thought to be operating in late-type, main-sequence stars. In this paper, we present aSMWO-index time series composed from different data sources for the solar-like star HD 140538 and derive a period of 3.88 ± 0.02 yr for its activity cycle. Furthermore, we analyse the high-cadence, seasonalSMWOdata taken with the TIGRE telescope and find a rotational period of 20.71 ± 0.32 days. In addition, we estimate the stellar age of HD 140538 as 3.7 Gyrs via a matching evolutionary track. This is slightly older than the ages obtained from gyrochronology based on the above rotation period, as well as the activity-age relation. These results, together with its stellar parameters that are very similar to a younger Sun, make HD 140538 a relevant case study for our understanding of solar activity and its evolution with time.
关键词：Key wordsenstars: atmospheresstars: activitystars: chromospheresstars: late-typestars: individual: HD 140538stars: rotation