Activity of ET Dra—a Star of FK Com Type

IF 1.3 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astrophysical Bulletin Pub Date : 2023-02-08 DOI:10.1134/S1990341322040101

I. S. Savanov, S. V. Karpov, G. M. Beskin, A. V. Biryukov, S. F. Bondar, E. A. Ivanov, E. V. Katkova, N. V. Lyapsina, A. V. Perkov, V. V. Sasyuk, S. A. Naroenkov, M. A. Nalivkin, V. B. Puzin, E. S. Dmitrienko

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Abstract—We present new results of the study of ET Dra—a star of the FK Com type—based on observations carried out at the Zvenigorod Observatory of the Institute of Astronomy of RAS with the help of the FRAM-ORM telescope of the La Palma observatory (Spain) and the broadband optical monitoring system Mini-MegaTORTORA, located on the territory of the SAO RAS. We have studied changes in the shape of the light curve caused by the rotational modulation of a star with spots on its surface and the long-term variability of the star’s brightness. An independent determination of the rotation period of \({{P}_{{{\text{phot}}}}}\) was carried out using all sets of observations available to us. The increase in the brightness of the star near HJD 2459044 during observations with the FRAM-ORM telescope in all three filters was interpreted by us as a stellar flare. Our flare energy estimates are \(2.8 \times {{10}^{{37}}}\), \(1.9 \times {{10}^{{37}}}\), and \(1.5 \times {{10}^{{37}}}\) erg in the \(B\), \(V\), and \(R\) wavelength ranges, respectively. Observations with a duration of more than 2200 days, carried out at the SAO RAS, opened up the possibility of analyzing the long-term brightness variability of ET Dra. Evidence was found for the existence of cycles lasting 580 days and 810 days (1.55 and 2.23 years, respectively).

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fkcom型ET dra - Star的活性

摘要:本文介绍了在西班牙拉帕尔马天文台(La Palma Observatory)的FRAM-ORM望远镜和位于SAO RAS地区的宽带光学监测系统Mini-MegaTORTORA的帮助下，在RAS天文研究所Zvenigorod天文台进行的ET dra -一颗fkcom型恒星研究的新结果。我们研究了一颗表面有黑子的恒星的旋转调制引起的光曲线形状的变化，以及这颗恒星亮度的长期变化。利用所有可用的观测资料，对\({{P}_{{{\text{phot}}}}}\)的自转周期进行了独立的确定。FRAM-ORM望远镜在所有三个滤光片上观测到的hdd2459044附近恒星亮度的增加被我们解释为恒星耀斑。我们对耀斑能量的估计分别是\(B\)、\(V\)和\(R\)波长范围内的\(2.8 \times {{10}^{{37}}}\)、\(1.9 \times {{10}^{{37}}}\)和\(1.5 \times {{10}^{{37}}}\) erg。在SAO RAS进行了超过2200天的观测，为分析ET Dra的长期亮度变化提供了可能。有证据表明存在持续580天和810天(分别为1.55年和2.23年)的周期。

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

Astrophysical Bulletin 地学天文-天文与天体物理

CiteScore

2.00

自引率

33.30%

发文量

审稿时长

>12 weeks

期刊介绍： Astrophysical Bulletin is an international peer reviewed journal that publishes the results of original research in various areas of modern astronomy and astrophysics, including observational and theoretical astrophysics, physics of the Sun, radio astronomy, stellar astronomy, extragalactic astronomy, cosmology, and astronomy methods and instrumentation.