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arXiv 1502.04004astro-ph.SRastro-ph.EP
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K2变星表:K2活动1和0中的变星和双星

K2 Variable Catalogue: Variable Stars and Eclipsing Binaries in K2 Campaigns 1 and 0

D. J. Armstrong, J. Kirk, K. W. F. Lam, J. McCormac, S. R. Walker, D. J. A. Brown, H. P. Osborn, D. L. Pollacco, J. Spake

摘要:

我们已经创建了一个变星的目录,这些变星是从公开的K2任务数据中搜索到的。该星表提供了8395颗变星的标识符,其中包括199颗周期在60 d以内的候选食双星和3871颗周期或准周期天体,周期1为20 d,周期0为15 d。从可用数据中提取光变曲线并消除趋势。这些搜索使用算法和人类分类的组合,导致每个对象作为一个日食二进制,正弦周期,准周期,或非周期性变量的分类器。变化的来源还没有确定,但可能出现在非食双星的情况下,从脉动或恒星活动。每一个天体都与K2飞行任务中与变星有关的客座观测者建议进行交叉匹配,在某些情况下,这些建议指定了变星类型。去除趋势的光变曲线也与目前公开的光变曲线进行了比较。由此产生的目录可通过MAST档案库在https://archive.stsci.edu/pretag/k2varcat/上在线获得,并给出了所看到的变化的ID,类型,周期,半振幅和范围。我们还为每个对象提供了消除趋势的光变曲线。

英文摘要:

We have created a catalogue of variable stars found from a search of the publicly available K2 mission data from Campaigns 1 and 0. This catalogue provides the identifiers of 8395 variable stars, including 199 candidate eclipsing binaries with periods up to 60d and 3871 periodic or quasi-periodic objects, with periods up to 20d for Campaign 1 and 15d for Campaign 0. Lightcurves are extracted and detrended from the available data. These are searched using a combination of algorithmic and human classification, leading to a classifier for each object as an eclipsing binary, sinusoidal periodic, quasi periodic, or aperiodic variable. The source of the variability is not identified, but could arise in the non-eclipsing binary cases from pulsation or stellar activity. Each object is cross-matched against variable star related guest observer proposals to the K2 mission, which specifies the variable type in some cases. The detrended lightcurves are also compared to lightcurves currently publicly available. The resulting catalogue is made available online via the MAST archive at https://archive.stsci.edu/prepds/k2varcat/, and gives the ID, type, period, semi-amplitude and range of the variation seen. We also make available the detrended lightcurves for each object.

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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