Abstract

The paper is devoted to the analysis of the variability of the \(\gamma\) Cas-type star HD 45995 in both optical and X-ray ranges. The variability of the line profiles of HD 45995 has been detected both for long (350–380 days) and short (11–87 minutes) time ranges. Based on the photometric light curves of HD 45995 obtained with the TESS satellite, we refined the rotation period of the star at \(P=0.8443\pm 0.0009\) days. These light curves reveal components with periods of about 11\({{}^{\textrm{h}}}\) typical for non-radial pulsations of B stars and components with periods of about 4–14 days, the nature of which is still unknown. We must note, that the latter components may be of an instrumental character, for example, due to the satellite drift. The pattern of the photometric variability, according to the TESS data, changes significantly for different observation epochs in 2018/2019 and 2020/2021. In the X-ray light curves of HD 45995, the presence of superfast variations with a period of \(P=48.5\pm 0.5\)seconds is suspected.

中文翻译：

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$$\gamma$$ Cas 恒星的光学和 X 射线变化：HD 45995

摘要

本文致力于分析\(\gamma\) Cas型恒星HD 45995在光学和X射线范围内的变异性。HD 45995 线剖面的变异性已在长（350-380 天）和短（11-87 分钟）时间范围内检测到。根据TESS卫星获得的HD 45995的光度光曲线，我们细化了恒星在\(P=0.8443\pm 0.0009\)天的自转周期。这些光变曲线揭示了 B 星非径向脉动典型的周期约为 11 \({{}^{\textrm{h}}}\)的成分以及周期约为 4-14 天的成分，其性质仍然未知。我们必须注意，后一个组成部分可能具有工具性特征，例如，由于卫星漂移。根据TESS数据，2018/2019和2020/2021不同观测时期的光度变异性模式发生显着变化。在HD 45995的X射线光变曲线中，怀疑存在周期为\(P=48.5\pm 0.5\)秒的超快变化。