Activity Cycles of the Star FK Com

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
I. S. Savanov, S. A. Naroenkov, M. A. Nalivkin, E. S. Dmitrienko
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Abstract

We present the results of our photometric observations of the chromospherically active star FK Com (prototype of its group of stars) acquired during the recent 5 years (2018–2023) at the INASAN observatories in Zvenigorod and Simeiz and at the Russian–Cuban observatory in Habana (Republic of Cuba). In total, we obtained 9060 estimates of the star’s brightness in the V filter between 2018 and 2023. Our measurements, as well as data from the literature and from the Kamogata Wide-field Survey (KWS) archive, were combined into a unified set containing 17 653 measurements for a time interval about 57 years long. Based on the power spectrum derived from these data, we identified possible activity cycles \({{P}_{{{\text{cycl}}}}}\), estimated by us to be 2.4, 5.63, 8, 13.6, 30, and 49 years. The dominating \({{P}_{{{\text{cycl}}}}}\) is 5.63 years long. We show that the dominating cycle found by us from extensive data to be about 5.63 years (5.4–5.8 years from other sources in the literature) can also be noticed from the analysis of earlier studies. We compared our results on the activity cycles of FK Com to data on long-term variations of two other stars of the same type, HD 199178 (V1794 Cyg) and ET Dra. Data on \({{P}_{{{\text{cycl}}}}}\) of other chromospherically active stars (from the literature and from our measurements) were used to analyze the \(\log (1{\text{/}}{{P}_{{{\text{rot}}}}}){-} \log ({{P}_{{{\text{cycl}}}}}{\text{/}}{{P}_{{{\text{rot}}}}})\) diagram. We make a conclusion on the compatibility of our determinations of activity cycles for stars of the FK Com type with data for RS CVn stars.

Abstract Image

FK Com 星的活动周期
摘要我们介绍了最近 5 年(2018-2023 年)在位于兹韦尼戈罗德和锡梅伊兹的 INASAN 观测台以及位于哈瓦那(古巴共和国)的俄罗斯-古巴观测台对色球活动恒星 FK Com(其星群原型)的测光观测结果。在 2018 年至 2023 年期间,我们总共获得了 9060 个 V 滤光片中恒星亮度的估计值。我们的测量数据,以及来自文献和鸭俣宽视场巡天(KWS)档案的数据,被合并成一个统一的数据集,其中包含 17 653 次测量,时间间隔约为 57 年。根据这些数据得出的功率谱,我们确定了可能的活动周期({{P}_{text/{cycl}}}}}\ ),估计分别为 2.4 年、5.63 年、8 年、13.6 年、30 年和 49 年。主周期({{P}_{text/{cycl}}}}}\ )的长度为 5.63 年。我们从大量数据中发现的主周期约为 5.63 年(其他文献来源为 5.4-5.8 年),这也可以从早期研究的分析中发现。我们将FK Com的活动周期结果与另外两颗同类型恒星HD 199178 (V1794 Cyg)和ET Dra的长期变化数据进行了比较。其他色球活动恒星的\({{P}_{\text{rot}}}}}\)数据(来自文献和我们的测量结果)被用来分析\(\log (1{\text{/}}{P}_{{\text{rot}}}}}){-})\log ({{P}_{{{\text{cycl}}}}}{\text{/}}{{P}_{{{\text{rot}}}}})\) diagram.我们得出的结论是,我们对FK Com型恒星活动周期的测定与RS CVn恒星的数据是一致的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Astronomy Reports
Astronomy Reports 地学天文-天文与天体物理
CiteScore
1.40
自引率
20.00%
发文量
57
审稿时长
6-12 weeks
期刊介绍: Astronomy Reports is an international peer reviewed journal that publishes original papers on astronomical topics, including theoretical and observational astrophysics, physics of the Sun, planetary astrophysics, radio astronomy, stellar astronomy, celestial mechanics, and astronomy methods and instrumentation.
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