Discovery of short-term activity cycles in F-type stars

Discovery of short-term activity cycles in F-type stars
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F型恒星短期活动周期的发现

DOI:
10.1051/0004-6361/201834319
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发表时间:
2019
影响因子:
6.5
通讯作者:
Schröder
Schröder
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Mittag;Schmitt;J. H. M. M;Hempelmann;Schröder

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先前的研究揭示了F型星星τBoo的120天活动周期,这是迄今为止发现的最短活动周期。问题是短期活动周期是否是F型恒星的常见现象。为了解决这个问题,我们analyseS指数的时间序列的F-型恒星TIGRE望远镜搜索的周期变化,最大长度为2年,使用广义的Lomb-Scargle周期图方法。在我们的样本中,我们发现了四颗F型星,它们的周期变化短于一年。然而,这些变化的幅度在我们的样本中的F-星型的恒星似乎是小于太阳型的恒星与发达的周期活动,显然只代表了总活动的一部分。我们的结论是,在F-星,活动的时间行为不同于太阳和较冷的主序星,短期周期变化与浅振幅的周期似乎占上风,而不是周期与10+年的周期和更大的周期振幅。
Previous studies have revealed a 120 day activity cycle in the F-type starτBoo, which represents the shortest activity cycle discovered until now. The question arises as to whether or not short-term activity cycles are a common phenomenon in F-type stars. To address this question, we analyseS-index time series of F-type stars taken with the TIGRE telescope to search for periodic variations with a maximal length of 2 years using the generalised Lomb-Scargle periodogram method. In our sample, we find four F-type stars showing periodic variations shorter than one year. However, the amplitude of these variations in our sample of F-star type stars appears to be smaller than that of solar-type stars with well-developed cyclic activity, and apparently represents only a part of the total activity. We conclude that among F-stars, the time-behaviour of activity differs from that of the Sun and cooler main sequence stars, as short-term cyclic variations with shallow amplitude of the cycle seem to prevail, rather than cycles with 10+ years periods and a larger cycle amplitude.
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