通过CoRoT光变曲线寻找PDKEEPAAA星的脉动
Looking for pulsations in HgMn stars through CoRoT lightcurves
摘要：
HgMn化学性质特殊的恒星是主序星中最安静的恒星之一。然而，根据理论预测，这些恒星可能有与铁峰值元素非常强烈的过剩有关的脉动，这是由上层原子扩散产生的。这样的脉动从来没有从地面观测中探测到过。我们的目标是使用CoRoT卫星提供的高质量光变曲线来寻找HgMn恒星中脉动的签名。我们在CoRoT计划观测的一个区域中，从VLT-GIRAFFE多目标摄谱仪巡天中识别出了三颗暗星（V>12）。它们呈现出典型的HgMn星特征。从2007年10月24日开始，CoRoT卫星利用系外行星CCD（附加方案）对它们进行了长期（131天）观测。在目前的工作中，我们提出了这三颗星的地基光谱的分析和相应的CoRoT光变曲线的分析。这三个HgMn候选人中的两个表现出低振幅（小于1.6毫等）的周期性变化（4.3和2.53天，分别与谐波），这是兼容的理论模型预测的周期。
英文摘要：
HgMn Chemically Peculiar stars are among the quietest stars of the main-sequence. However, according to theoretical predictions, these stars could have pulsations related to the very strong overabundances of iron peak elements, which are produced by atomic diffusion in upper layers. Such pulsations have never been detected from ground based observations. Our aim is to search for signatures of pulsations in HgMn stars using the high quality lightcurves provided by the CoRoT satellite. We identified three faint stars (V>12), from VLT-GIRAFFE multiobject spectrograph survey in a field which was planned for observation by CoRoT. They present the typical characteristics of HgMn stars. They were observed by the CoRoT satellite during the long run (131 days) which started from the 24th of October 2007, with the exoplanets CCD's (Additional Programme). In the present work, we present the analysis of the ground based spectra of these three stars and the analysis of the corresponding CoRoT lightcurves. Two of these three HgMn candidates show low amplitude (less than 1.6 mmag) periodic variations (4.3 and 2.53 days respectively, with harmonics) which are compatible with periods predicted by theoretical models.
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