Abstract

The results of ultrahigh-time-resolution (\(\Delta T\sim 12\) s) observations of the B1 Iab supergiant \(\rho\) Leo with the 1.25-m telescope at the Crimean Astronomical Station of the SAI MSU are presented. Regular line profile variations with periods of 15–30 min have been revealed. Significant changes in the average line profiles on time intervals of 1–3 days have been detected. Evidence for the existence of short-period line profile variations on time scales of 15–25 min is provided. The nature of the short-period line profile variations is discussed. The possibility of studying the fast variations in the profiles of broad lines (mostly the Balmer hydrogen and He I lines) using low-resolution spectrographs with \(R=1000{-}2000\) at 1–2-m telescopes is pointed out.

中文翻译：

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$$ \ boldsymbol {\ rho} $$ Leo光谱中的超快线路轮廓变化：新结果

摘要

在SAI MSU的克里米亚天文站用1.25米望远镜对B1 Iab超巨型\（\ rho \）狮子座超高分辨率时间（\（\ Delta T \ sim 12 \） s）的观测结果是呈现。已经揭示了15–30分钟的定期线轮廓变化。在1-3天的时间间隔内，平均线轮廓发生了显着变化。提供了在15–25分钟的时间尺度上存在短周期线轮廓变化的证据。讨论了短周期线轮廓变化的性质。使用\（R = 1000 {-} 2000 \）的低分辨率光谱仪研究宽线（主要是Balmer氢和He I线）的轮廓快速变化的可能性 指出了1-2米望远镜。