论文标题
tess的观测pleiades群集：三角洲史密斯的托儿所
TESS observations of the Pleiades cluster: a nursery for delta Scuti stars
论文作者
论文摘要
我们研究了Pleiades开放式群集的89名A-和F型成员，其中包括五名逃脱成员。我们测量了49颗恒星的投影旋转速度（v sin I），并确认恒星旋转会导致色量图中的主序列扩大。使用NASA苔丝任务（加上开普勒/K2观察到的一颗恒星）的时间序列光度法，我们检测到36颗恒星中的Delta Scuti脉动。脉动脉冲中间的pleiades恒星的比例异常高（超过80％），其有效温度范围与理论模型非常吻合。另一方面，脉动光谱的特征是多种多样的，并且与恒星温度无关，尤其质疑Delta Scutis的有用的NU_MAX关系的存在，至少对于年轻的恒星而言。通过包括在开普勒场中观察到的三角洲scuti恒星，我们表明，不稳定性条通过星际红色的距离移至红色。总体而言，这项工作证明了将观察结果与盖亚和苔丝结合起来的力量，用于在开放群集中研究脉动恒星。
We studied 89 A- and F-type members of the Pleiades open cluster, including five escaped members. We measured projected rotational velocities (v sin i) for 49 stars and confirmed that stellar rotation causes a broadening of the main sequence in the color-magnitude diagram. Using time-series photometry from NASA's TESS Mission (plus one star observed by Kepler/K2), we detected delta Scuti pulsations in 36 stars. The fraction of Pleiades stars in the middle of the instability strip that pulsate is unusually high (over 80%), and their range of effective temperatures agrees well with theoretical models. On the other hand, the characteristics of the pulsation spectra are varied and do not correlate with stellar temperature, calling into question the existence of a useful nu_max relation for delta Scutis, at least for young stars. By including delta Scuti stars observed in the Kepler field, we show that the instability strip is shifted to the red with increasing distance by interstellar reddening. Overall, this work demonstrates the power of combining observations with Gaia and TESS for studying pulsating stars in open clusters.
