λ Cep中与时间相关的吸收线轮廓变化
Epoch-dependent absorption line profile variability in lambda Cep
摘要：
我们提出了一个多历元的光谱监测活动的O6Ief星lambda Cep的分析。以前的观测报告说，在这颗恒星中存在两种非径向脉动模式。我们的数据揭示了一个更为复杂的情况。功率谱的频率内容从一个历元到另一个历元显著变化。我们发现没有稳定的频率，可以明确地归因于脉动。频率和变化模式的时代依赖性与这颗恒星和其他Oef恒星的风发射线相似，这表明这两种现象可能具有相同的起源，目前尚不清楚。
英文摘要：
We present the analysis of a multi-epoch spectroscopic monitoring campaign of the O6Ief star lambda Cep. Previous observations reported the existence of two modes of non-radial pulsations in this star. Our data reveal a much more complex situation. The frequency content of the power spectrum considerably changes from one epoch to the other. We find no stable frequency that can unambiguously be attributed to pulsations. The epoch-dependence of the frequencies and variability patterns are similar to what is seen in the wind emission lines of this and other Oef stars, suggesting that both phenomena likely have the same, currently still unknown, origin.
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