ET Dra Activity According to Observations in 2018–2023

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

The results of new photometric observations of the chromospherically active star ET Dra, performed using telescopes of the Zvenigorod INASAN Observatory, the Russian-Cuban Observatory in the territory of the Republic of Cuba (Havana), and the Terskol INASAN Observatory (a total of 8 sets of observations) with the addition of archival observations of the Kamogata Wide-field Survey. Variations in the shape of the light curve caused by the rotational modulation of a star with spots on the surface, as well as studies of the long-term variability of the star’s brightness, were investigated based on the data acquired in 2018–2023. Characteristic changes in the ET Dra light curve were noted including a decrease of the stellar brightness in the \(V\) filter, its cyclic variations, and subsequent brightness increase. The shape of the phase curve and the duration of the extended minimum of brightness vary. During the HJD 245 9670–245 9715 interval, the amplitude of the star’s brightness variability reached a maximum value of more than 0.4m, as it was in 1990. The surface temperature inhomogeneities maps were calculated and estimates of the spottedness parameter S of the object were performed for each of the 8 sets of observations. Maximum value of parameter S was 32.2‒33.5%. Based on the constructed power spectra, the values of possible cycles of long-term activity of the star were obtained as 570 and 1160d (1.56 and 3.18 years, respectively).

Abstract Image

Abstract Image

2018-2023 年观测到的 ET Dra 活动
摘要利用兹韦尼格罗德 INASAN 天文台、古巴共和国境内(哈瓦那)的俄罗斯-古巴天文台和特尔斯科尔 INASAN 天文台的望远镜(共 8 组观测数据)对色球活动恒星 ET Dra 进行了新的测光观测,并增加了 Kamogata 宽视场巡天的档案观测数据。根据 2018-2023 年获得的数据,研究了表面有斑点的恒星旋转调制引起的光曲线形状变化,以及恒星亮度长期变化的研究。注意到ET Dra光曲线的特征性变化,包括恒星亮度在(V)滤光片中的下降、周期性变化以及随后的亮度上升。相位曲线的形状和延长的最低亮度持续时间各不相同。在HJD 245 9670-245 9715区间,恒星亮度变化的振幅达到了最大值,超过了0.4米,与1990年的情况一样。对 8 组观测数据中的每一组都计算了表面温度不均匀度图,并估算了天体的斑度参数 S。参数 S 的最大值为 32.2-33.5%。根据构建的功率谱,得出该恒星可能的长期活动周期值为 570d 和 1160d(分别为 1.56 年和 3.18 年)。
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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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