Characterizing the Nearest Old Open Cluster: Ruprecht 147

这是一个最近发现的古老的（~2 Gyr），附近（~ 200pc）疏散星团的观测研究。这个集群?S的近距离意味着主序星可以被研究到褐矮星的极限，白矮星也是可能的。PI将完成对现有数据的分析，以及对光学、紫外线和x射线波长的新观测数据的分析，以确定星团中恒星的特征。他还将利用文献中的存档数据。恒星距离将通过天体测量观测来测量；活动将通过x射线、发射光谱和光度法测量；星系团成员将通过使用径向速度测量进行适当的运动研究来确定。更广泛的影响包括产生对天文学其他领域有用的结果，研究生研究助理的参与，以及天文学入门课程的实验室练习的发展。

This is an observational study of a recently discovered old (~2 Gyr), nearby (~200 pc away) Open Cluster. This cluster?s close proximity means that main sequence stars could be studied to the brown dwarf limit and white dwarfs are also possible. The PI will complete analysis of data already in hand, and data from new observations at optical, ultraviolet and x-ray wavelengths in order to characterize the stellar membership in the cluster. He will also make use of archived data in the literature. Stellar distances will be measured using astrometric observations; activity will be measured from x-ray and optical emission-line spectroscopy and photometry; and cluster membership will be identified from proper motion studies using radial-velocity measurements. Broader impacts include producing results that are useful to other fields of astronomy, the involvement of a graduate research assistant, and development of a laboratory exercise for introductory astronomy courses.