探索本地Milky Way：M矮星作为银河系人口的示踪剂
Exploring the Local Milky Way: M Dwarfs as Tracers of Galactic Populations
摘要：
我们已经收集了一个光谱样本的低质量矮星观察斯隆数字巡天沿着银河系的视线，旨在调查薄和厚磁盘的可观测特性的一部分。这个样本的~7400 K和M星也测量了ugriz测光，自行和径向速度。我们已经计算了UVW空间运动分布，并调查其结构相对于银河平面的垂直距离。我们将限制薄和厚磁盘的速度分散，使用两个组件高斯拟合。我们还比较了这些运动学分布领先的银河系模型。最后，我们研究了薄盘和厚盘之间其他可能的可观察差异，如颜色，活性分数和金属丰度。
英文摘要：
We have assembled a spectroscopic sample of low-mass dwarfs observed as part of the Sloan Digital Sky Survey along one Galactic sightline, designed to investigate the observable properties of the thin and thick disks. This sample of ~7400 K and M stars also has measured ugriz photometry, proper motions, and radial velocities. We have computed UVW space motion distributions, and investigate their structure with respect to vertical distance from the Galactic Plane. We place constraints on the velocity dispersions of the thin and thick disks, using two-component Gaussian fits. We also compare these kinematic distributions to a leading Galactic model. Finally, we investigate other possible observable differences between the thin and thick disks, such as color, active fraction and metallicity.
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