疏散星团作为星系盘示踪剂：I.项目动机、群成员与体三维运动
Open Clusters as Galactic Disk Tracers: I. Project Motivation, Cluster Membership and Bulk Three-Dimensional Kinematics
摘要：
我们已经开始调查的化学和动力学性质的银河系盘跟踪疏散星团。在这第一个贡献，我们的调查的总体目标进行了概述，并讨论了使用星团作为银河系盘示踪剂样本的优势和局限性。我们还提出了中等分辨率（R ~ 15,0000）光谱的疏散星团恒星获得的水螅多目标摄谱仪的Cerro Tololo美洲天文台4米和WIYN 3.5米望远镜。在这里，我们使用这些数据来确定3436颗恒星的径向速度在约3千秒差距内的疏散星团的领域，特别注意的恒星在第谷-2目录中有自行。还确定了其他径向速度成员（没有Tycho-2自行），可用于这些集群的未来研究。径向速度，自行车，和从集群中心的恒星的角距离被用来获得集群成员的概率，在每个集群领域的恒星使用非参数的方法，和集群成员，从而确定，反过来，获得可靠的散装三维运动的71个目标疏散星团中的66个。我们确定的高概率集群成员有助于澄清许多集群的颜色-星等序列，并且是未来中阶梯分辨率光谱学以及空间干涉测量任务（SIM Planetquest）的天体测量研究的主要目标。
英文摘要：
We have begun a survey of the chemical and dynamical properties of the Milky Way disk as traced by open star clusters. In this first contribution, the general goals of our survey are outlined and the strengths and limitations of using star clusters as a Galactic disk tracer sample are discussed. We also present medium resolution (R ~ 15,0000) spectroscopy of open cluster stars obtained with the Hydra multi-object spectrographs on the Cerro Tololo Inter-American Observatory 4-m and WIYN 3.5-m telescopes. Here we use these data to determine the radial velocities of 3436 stars in the fields of open clusters within about 3 kpc, with specific attention to stars having proper motions in the Tycho-2 catalog. Additional radial velocity members (without Tycho-2 proper motions) that can be used for future studies of these clusters were also identified. The radial velocities, proper motions, and the angular distance of the stars from cluster center are used to derive cluster membership probabilities for stars in each cluster field using a non-parametric approach, and the cluster members so-identified are used, in turn, to derive the reliable bulk three-dimensional motion for 66 of 71 targeted open clusters. The high probability cluster members that we identify help to clarify the color-magnitude sequences for many of the clusters, and are prime targets for future echelle resolution spectroscopy as well as astrometric study with the Space Interferometry Mission (SIM Planetquest).
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