Exploring the local milky way: M dwarfs as tracers of Galactic populations

被引：87

作者：

Bochanski, John J.

Munn, Jeffrey A.

Hawley, Suzanne L.

West, Andrew A.

Covey, Kevin R.

Schneider, Donald P.

机构：

[1] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[2] US Naval Observ, Flagstaff, AZ 86001 USA

[3] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[5] Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA

来源：

ASTRONOMICAL JOURNAL | 2007年 / 134卷 / 06期

关键词：

Galaxy : kinematics and dynamics; Galaxy : structure; stars : fundamental parameters; stars; low-mass; brown dwarfs;

D O I：

10.1086/522053

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have assembled a spectroscopic sample of low-mass dwarfs observed as part of the Sloan Digital Sky Survey along one Galactic sight line, designed to investigate the observable properties of the thin and thick disks. This sample of similar to 7400 K and M stars also has measured ugriz photometry, proper motions, and radial velocities. We compute 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.

引用

页码：2418 / 2429

页数：12

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