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首页> 外文期刊>The Astrophysical Journal. Supplement Series >The K2 Bright Star Survey. I. Methodology and Data Release
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The K2 Bright Star Survey. I. Methodology and Data Release

机译：K2明星调查。 I.方法和数据发布

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While the Kepler mission was designed to look at tens of thousands of faint stars (V ? 12), brighter stars that saturated the detector are important because they can be and have been observed very accurately by other instruments. By analyzing the unsaturated scattered-light ?halo? around these stars, we retrieved precise light curves of most of the brightest stars in K2 fields from Campaign4 onward. The halo method does not depend on the detailed cause and form of systematics, and we show that it is effective at extracting light curves from both normal and saturated stars. The key methodology is to optimize the weights of a linear combination of pixel time series with respect to an objective function. We test a range of such objective functions, finding that lagged Total Variation, a generalization of Total Variation, performs well on both saturated and unsaturated K2 targets. Applying this to the bright stars across the K2 Campaigns reveals stellar variability ubiquitously, including effects of stellar pulsation, rotation, and binarity. We describe our pipeline and present a catalog of the 161 bright stars, with classifications of their variability, asteroseismic parameters for red giants with well-measured solar-like oscillations, and remarks on interesting objects. These light curves are publicly available as a High Level Science Product from the Mikulski Archive for Space Telescopes (footnote 17).
机译：虽然开普勒的使命旨在看几万微弱的恒星（V？12），但饱和探测器的更明亮的恒星很重要，因为它们可以通过其他仪器非常准确地观察。通过分析不饱和散射光？晕？在这些恒星周围，我们从Campaign4向前从K2字段中的大部分最亮星的精确光线曲线。 Halo方法不依赖于系统性的详细原因和形式，并且我们表明它有效地从正常和饱和恒星中提取光曲线。关键方法是优化关于目标函数的像素时间序列的线性组合的权重。我们测试一系列这种客观函数，发现滞后的总变化，总变化的概括，在饱和和不饱和的K2靶点上表现良好。将此应用于K2竞选活动中的明亮恒星，普遍存在，包括恒星脉动，旋转和二义的效果。我们描述了我们的管道，并呈现了161个亮颗星的目录，具有可变性的分类，红色巨头的型号参数，具有良好测量的太阳能振荡，以及对有趣物体的备注。这些光线曲线是来自Mikulski存档的高级科学产品，用于空间望远镜（脚注17）。

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