Multi-object spectroscopy of stars in the CoRoT fields - I. Early-type stars in the CoRoT-fields IRa01, LRa01, LRa02
Multi-object spectroscopy of stars in the CoRoT fields - I. Early-type stars in the CoRoT-fields IRa01, LRa01, LRa02
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CoRoT 场中恒星的多目标光谱 - I CoRoT 场中的早期型恒星 IRa01、LRa01、LRa02
DOI：
10.1051/0004-6361/201118032
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发表时间：
--
影响因子：
6.5
通讯作者：
Moutou
中科院分区：
文献类型：
--
作者：
Sebastian;Guenther;Schaffenroth;Gandolfi;Deleuil;Moutou
对巨星的观测表明，在中等质量的恒星中，巨星出现的频率要比类太阳恒星高得多。到目前为止，所有已知的巨大恒星的行星都在离它们的主恒星相对较远的地方运行。目前尚不清楚中等质量恒星在主序星上是否也有许多近距离行星，这些行星在恒星变成巨星时被吞没。因此，为了了解行星的形成和演化，弄清中等质量的主序星是否有近距离行星是很重要的。对中质量恒星的凌日行星进行AimsA调查将是解决这个问题的理想选择，因为凌日行星的探测不受这些恒星快速旋转的影响。有了CoRoT，可以探测到光谱类型为B4V的恒星周围的凌日行星。作为有效调查的第一步，我们需要在corot场中识别中等质量的恒星，然后将其用作输入列表。方法利用多目标光谱仪AAOmega在CoRoT视场IRa01、LRa01、LRa02中采集到14.5等以下的O、B、A星的光谱类型，对输入列表进行整理。通过与库中的模板光谱比较，确定了光谱类型。结果用CoRoT一共识别出1856颗A星和B星。利用这些恒星的多个光谱，我们发现所得的光谱分类精度为A星和B星的1.61±0.14个亚类。考虑到在这些领域中发现的迟型恒星中的行星数量，我们估计有一到四颗中等质量恒星的凌日行星等待被发现。我们的调查不仅使我们能够开展专门的行星搜索计划，而且对于CoRoT数据库中早期恒星的光曲线的任何类型的研究都是必不可少的。我们还表明，有可能将调查扩展到CoRoT使用光度法确定的光谱类型观察到的所有领域。
ContextObservations of giant stars indicate that the frequency of giant planets is much higher for intermediate-mass stars than for solar-like stars. Up to now all known planets of giant stars orbit at relatively far distances from their host stars. It is not known whether intermediate-mass stars also had many close-in planets when they were on the main sequence, which were then engulfed when the star became a giant star. To understand the formation and evolution of planets it is therefore important to find out whether main-sequence stars of intermediate-mass have close-in planets or not.AimsA survey for transiting planets of intermediate-mass stars would be ideal to solve this question, because the detection of transiting planets is not affected by the rapid rotation of these stars. With CoRoT it is possible to detect transiting planets around stars up to a spectral type B4V. As a first step for an efficient survey we need to identify intermediate-mass stars in the CoRoT-fields, which can then be used as an input list.MethodsTo compile the input list we derived the spectral types of essentially all O, B and A stars down to 14.5 mag in the CoRoT fields IRa01, LRa01, LRa02 taken with the multi-object spectrograph AAOmega. We determined the spectral types by comparing the spectra with template spectra from a library.ResultsIn total we identify 1856 A and B stars that have been observed with CoRoT. Using multiple spectra of these stars, we find that the accuracy of the resulting spectral classification is 1.61 ± 0.14 sub-classes for A and B stars.ConclusionsGiven the number of planets that have been detected in these fields amongst late-type stars, we estimate that there are one to four transiting planets of intermediate-mass stars waiting to be discovered. Our survey not only allows us to carry out a dedicated planet search programme but is also essential for any types of studies of the light curves of early-type stars in the CoRoT database. We also show that it would be possible to extend the survey to all fields that CoRoT has observed using photometrically determined spectral types.
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