Abstract

We present the results of our analysis of the photospheric and chromospheric activity of the star DS Tuc (DS Tuc A, HD 222259A), which is a member of the Tucana–Horologium (Tuc–Hor) group with an age of 45 Myr. The star DS Tuc may be considered as the prototype of a young Sun, while its planetary system may be considered as the prototype of a young Solar system. Using data from the archive of TESS observations, we have analyzed the activity of this star. According to our estimate, the stellar rotation period is \(P=2.85\pm 0.18\) days, which coincides with its known estimates. The light curve has been analyzed by the method of solving the inverse problem of reconstructing the maps of surface temperature inhomogeneities. We show that there are concentrations of spots at two longitudes on these maps. The spot positions undergo changes. The fraction \(S\) of the spotted stellar surface is about 3.3 \(\%\). We have studied the object’s position on the \(S\)–age, \(S\)–rotation period, and \(S\)–Rossby number diagrams and concluded that it corresponds to the general pattern of the dependences established previously for young stars with planetary systems and solar-type stars. Based on All Sky Automated Survey observations, we have estimated for the first time the possible activity cycle of DS Tuc to be 1610 days (4.4 years).

中文翻译：

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年轻的太阳类似物的活动-具有系外行星DS Tuc的恒星

摘要

我们介绍了我们对恒星DS Tuc（DS Tuc A，HD 222259A）的光球和色球活动的分析结果，该星是Tucana-Horologium（Tuc-Hor）组的成员，年龄为45 Myr。DS Tuc恒星可被视为年轻太阳的原型，而其行星系统可被视为年轻太阳系的原型。利用TESS观测资料库中的数据，我们分析了该恒星的活动。根据我们的估计，恒星旋转周期为\（P = 2.85 \ pm 0.18 \）天，与其已知的估计相符。通过解决重建表面温度不均匀性图的反问题的方法分析了光曲线。我们显示在这些地图上在两个经度上都有斑点的集中。现货位置发生变化。点状恒星表面的分数\（S \）约为3.3 \（\％\）。我们已经研究了对象在\（S \）– age，\（S \）–旋转周期和\（S \）上的位置-罗斯比数图，并得出结论，它对应于先前为具有行星系统和太阳型恒星的年轻恒星建立的依赖关系的一般模式。根据全天候自动调查的观测，我们首次估计DS Tuc的可能活动周期为1610天（4.4年）。