OBA星的快速光谱变化
Fast spectral variations of OBA stars
摘要：
我们使用FOcal Reducer低色散光谱仪FORS 1和FORS 2在光谱偏振模式下对选定的OBA星的磁场进行了搜索，发现在磁性OBA星的光谱中存在强烈的线轮廓变化（LPV）。更具体地说，我们在A0超巨星HD 92207的FORS 2光谱中检测到选定线在分钟时间尺度上的中等线轮廓变化（Hubrig et al. 2014）。最近，我们在6米BTA望远镜上用多模缩焦器SCORPIO研究了选定的OBA星的谱线轮廓的变化。在O型星HD 93521（O9.5III）的光谱中，我们发现了H和He谱线的有规律的变化，周期分别为4-5分钟和32-36分钟。短时间尺度的光谱变化的可能起源进行了讨论。
英文摘要：
Our search for magnetic fields in selected OBA stars using FOcal Reducer low dispersion Spectrographs FORS 1 and FORS 2 in spectropolarimetric mode revealed the presence of strong line profile variations (LPV) in spectra of magnetic OBA stars. More specifically, we detected moderate line profile variations of selected lines on a time scale of minutes in FORS 2 spectra of the A0 supergiant HD 92207 (Hubrig et al. 2014). Recently, we investigated the variability of line profiles of selected OBA stars with the multi-mode focal reducer SCORPIO at the 6-meter BTA telescope. We discovered regular variations of H and He lines in the spectra of the O-type star HD 93521 (O9.5III) with periods ~4-5 and ~32-36 minutes. The possible origin of short time-scale spectral variations is discussed.
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