OBA星光谱中的超快线轮廓变化III：A0星$α^2\,$ CVn，新结果
Superfast Line Profile Variations in the Spectra of OBA Stars III: A0 Star $α^2\,$CVn, New Results
摘要：
这项工作是早型星光谱谱线轮廓超快变率研究的继续。光谱中的线轮廓变化（LPV）是一颗化学性质特殊的A0 Vp恒星$α^2\,$ CVn，使用2020年1月6日的观测结果进行了研究，该观测是在俄罗斯科学院（RAS）的特殊天体物理观测台（SAO）使用配备MSS光谱仪的6米BTA望远镜进行的。检测到H $_β$、Fe I，II和Cr I，II线的规则短期周期性变化，周期范围为$\sim\!$ 4至$\sim\!$ 140分钟。所有观测结果都确定了恒星的磁场。在整个观测期间测得的平均纵向磁场分量约为$\approx$ 600\，G，这接近于从众所周知的磁场相位曲线中预期的值。
英文摘要：
This work is a continuation of the studies of the ultrafast variability of line profiles in the spectra of early-type stars. Line profile variations (LPVs) in the spectrum a chemically peculiar A0Vp star $α^2\,$CVn are investigated using the January 6, 2020 observations carried out with the 6-meter BTA telescope at Special Astrophysical observatory (SAO) of the Russian Academy of Sciences (RAS) equipped with the MSS spectrograph. Regular short-term periodic variations of the H$_β$, Fe\,II, and Cr\,II lines were detected with periods ranging from $\sim\!$4 to $\sim\!$140 minutes. The magnetic field of the star was determined for all observations. The average measured longitudinal magnetic field component over the entire duration of observations is about $\approx$600\,G, which is close to the value expected from the well-known magnetic field phase curve.
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