论文标题

开普勒场矮人和子巨人的旋转:光谱$ v \ sin i $ from apogee

Rotation of Kepler field dwarfs and sub giants: Spectroscopic $v \sin I$ from APOGEE

论文作者

Simonian, Gregory V. A., Pinsonneault, Marc H., Terndrup, Donald M., van Saders, Jennifer L.

论文摘要

我们使用5,337个光谱$ v \ sin i $测量的Kepler矮人和Apogee调查中的子巨头来研究出色的旋转趋势。我们发现了10 km/s的检测阈值,这使我们能够探索中间质量恒星,这使主要序列,合并产品,年轻恒星和偶然同步的二进制型。我们看到蓝色的散乱者和野外圆点之间有明显的区别,在$α$ -rich的恒星中,蓝色散乱者的快速旋转截止与牛皮纸断裂一致。我们还发现,红色Straggler恒星样品中的快速旋转和RV变异性,比巨型分支凉爽得多,这使这些假说是活跃的,同步的二进制文件。我们看到明确的证据表明,现代角动量进化模型预测的域中的次级分支上的快速旋转和缓慢旋转之间存在过渡。我们发现,基于2个质量光度法,Huber等人(2014)添加的KIC靶标的光谱和光度法之间的实质性一致。对于未进化的下主序列,我们看到光度计二进制中快速旋转的浓度与在旋转期数据中观察到的相同,但速率增强。我们将这种差异归因于尚未解决的近相等光度光谱二进制二进制速度位移的速度位移。在凉爽的未进化恒星中,我们发现由光度计二进制文件引起的管道问题引起的过量快速旋转器分数过剩4%。

We use 5,337 spectroscopic $v \sin i$ measurements of Kepler dwarfs and subgiants from the APOGEE survey to study stellar rotation trends. We find a detection threshold of 10 km/s, which allows us to explore the spindown of intermediate-mass stars leaving the main sequence, merger products, young stars, and tidally-synchronized binaries. We see a clear distinction between blue stragglers and the field turnoff in $α$-rich stars, with a sharp rapid rotation cutoff for blue stragglers consistent with the Kraft break. We also find rapid rotation and RV variability in a sample of red straggler stars, considerably cooler than the giant branch, lending credence to the hypothesis that these are active, tidally-synchronized binaries. We see clear evidence for a transition between rapid and slow rotation on the subgiant branch in the domain predicted by modern angular momentum evolution models. We find substantial agreement between the spectroscopic and photometric properties of KIC targets added by Huber et al (2014) based on 2MASS photometry. For the unevolved lower main sequence, we see the same concentration toward rapid rotation in photometric binaries as that observed in rotation period data, but at an enhanced rate. We attribute this difference to unresolved near-equal luminosity spectroscopic binaries with velocity displacements on the order of the APOGEE resolution. Among cool unevolved stars we find an excess rapid rotator fraction of 4% caused by pipeline issues with photometric binaries.

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