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arXiv 1202.4947astro-ph.SR
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由CoRoT资料计算场星的自转

The rotation of field stars from CoRoT data

Laura Affer, Giuseppina Micela, Fabio Favata, Ettore Flaccomio

摘要:

我们提出了一个大样本的场星在太阳附近的周期测量,观察到的CoRoT在两个不同的方向的银河系。使用Scargle Lomb归一化周期图技术和自相关分析检测周期的存在。通过折叠光曲线分析支持的一致性验证对结果进行了评估。数据分析程序已经放弃了不可忽略的一部分光变曲线,由于仪器的文物,但它使我们能够识别大量的场星中的双星和双星。我们测量的周期范围很广,从0.25到100天,其中大部分是旋转周期。最终的星表包括1978个周期,其中1727个被确定为自转周期,169个被分类为脉动周期,82个被分类为双星系统的轨道周期。我们的样本存在不易校正的选择偏差,因此我们不使用轮换周期的分布来推导主序群的年龄分布。然而,使用自转作为年龄的代理,我们可以识别出一个年轻恒星(<6亿年)的样本,这将构成一个有价值的样本,并得到进一步光谱观测的支持,以研究太阳附近最近的恒星形成历史。

英文摘要:

We present period measurements of a large sample of field stars in the solar neighbourhood, observed by CoRoT in two different directions of the Galaxy. The presence of a period was detected using the Scargle Lomb Normalized Periodogram technique and the autocorrelation analysis. The assessment of the results has been performed through a consistency verification supported by the folded light curve analysis. The data analysis procedure has discarded a non-negligible fraction of light curves due to instrumental artifacts, however it has allowed us to identify pulsators and binaries among a large number of field stars. We measure a wide range of periods, from 0.25 to 100 days, most of which are rotation periods. The final catalogue includes 1978 periods, with 1727 of them identified as rotational periods, 169 are classified as pulsations and 82 as orbital periods of binary systems. Our sample suffers from selection biases not easily corrected for, thus we do not use the distribution of rotation periods to derive the age distribution of the main-sequence population. Nevertheless, using rotation as a proxy for age, we can identify a sample of young stars (< 600 Myr), that will constitute a valuable sample, supported by further spectroscopic observations, to study the recent star formation history in the solar neighborhood.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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