作者:S. G. Aliev、N. Z. Ismailov
DOI:10.1134/1.1320499
日期:2000.11
Analysis of spectrograms with high spectral and temporal resolution taken during four nights in 1998 has revealed spectral-line variability of the peculiar star HD 220825 with a quasi-period of $$0\mathop d\limits_. 0.12 \pm 0\mathop d\limits_. 0005$$ . The observed variations have the form of wavelike oscillations whose amplitude decreases or increases during the observations. The CrII, SiII, and TiII lines exhibit the strongest variability. The scale lengths of peculiar regions are estimated to be from 5000 to 15000 km based on data for different lines. The results provide evidence for the presence of real wavelike dynamical processes at the stellar surface that change the physical conditions in the stellar atmosphere.
对1998年四个晚上拍摄的高光谱和时间分辨率的光谱图进行分析,发现了奇特恒星HD 220825的光谱线变率,其准周期为$0\mathop d\limits_.0.12 \pm 0\mathop d\limits_.0005$$ .观测到的变化是波状振荡,振幅在观测过程中时大时小。CrII、SiII 和 TiII 线的变化最强。根据不同谱线的数据,奇特区域的尺度长度估计在 5000 至 15000 公里之间。这些结果为恒星表面存在真正的波状动力学过程,从而改变恒星大气中的物理条件提供了证据。