论文标题
与K2的金牛座中低质量恒星的旋转
Rotation of Low-Mass Stars in Taurus with K2
论文作者
论文摘要
我们为年轻人（$ \ sim $ 3 Myr）协会成员进行了对K2光曲线（LCS）的分析，除了较旧的（$ \ sim $ 30 Myr）的星星，这在很大程度上是金牛座分子云的前景。在156个最高信心的金牛座成员中，我们发现81 \％是周期性的。我们的年轻前景恒星样本是有偏见和不完整的，但几乎所有（37/38）都是周期性的。旋转速率随颜色的函数（质量代理）的整体分布与其他簇中的旋转速率相似：最慢的旋转器是早期的M光谱类型之一，旋转速度更快，旋转速度更快，旋转速度更快。金牛座年龄已经建立了较旧的簇（例如pleiades）的颜色和颜色/质量之间的关系。前景人口的恒星很少，但与USCO和PLEIADES时期分布一致。正如其他年轻群集中发现的那样，带有磁盘的星星平均旋转较慢，很少有磁盘的旋转速度快于$ \ sim $ 2 d。光曲线的总体幅度随着年龄的增长而降低，质量较高的恒星通常比较低的质量恒星降低。尽管物理机制驱动变异性，而所得的光曲线形态在这两个类别之间也有所不同，但具有圆盘的恒星的平均幅度比没有磁盘的恒星大。
We present an analysis of K2 light curves (LCs) from Campaigns 4 and 13 for members of the young ($\sim$3 Myr) Taurus association, in addition to an older ($\sim$30 Myr) population of stars that is largely in the foreground of the Taurus molecular clouds. Out of 156 of the highest-confidence Taurus members, we find that 81\% are periodic. Our sample of young foreground stars is biased and incomplete, but nearly all (37/38) are periodic. The overall distribution of rotation rates as a function of color (a proxy for mass) is similar to that found in other clusters: the slowest rotators are among the early M spectral types, with faster rotation towards both earlier FGK and later M types. The relationship between period and color/mass exhibited by older clusters such as the Pleiades is already in place by Taurus age. The foreground population has very few stars, but is consistent with the USco and Pleiades period distributions. As found in other young clusters, stars with disks rotate on average slower, and few with disks are found rotating faster than $\sim$2 d. The overall amplitude of the light curves decreases with age and higher mass stars have generally lower amplitudes than lower mass stars. Stars with disks have on average larger amplitudes than stars without disks, though the physical mechanisms driving the variability and the resulting light curve morphologies are also different between these two classes.
