Thick disk kinematics from data on red clump giants at the north galactic pole

被引：2
|
作者：
Rybka, S. P. [1 ]
Yatsenko, A. I. [1 ]
机构：
[1] Natl Acad Sci Ukraine, Main Astron Observ, UA-03680 Kiev, Ukraine
来源：
KINEMATICS AND PHYSICS OF CELESTIAL BODIES | 2009年 / 25卷 / 06期
关键词：
PROPER MOTIONS; 2MASS; STARS;
D O I：
10.3103/S0884591309060038
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The distribution of radial (U) and rotational (V) velocities of red clump giants was studied as a function of their heights above the galactic plane. The stars of this type were selected from the compiled catalogue of stellar proper motions and infrared photometry at the north galactic pole with the use of the diagram "color-reduced proper motion." According to the data on 1800 red clump giants located at heights from 1 to 3 kpc (mostly thick disk stars), mean kinematic parameters of the thick disk were determined: U (0) = -18 +/- 2 km/s, V (0) = -56 +/- 1 km/s, sigma (U) = 72 +/- 2 km/s, and sigma (V) = 58 +/- 1 km/s. The velocity of asymmetric drift V (0) and velocity variances sigma (U) , sigma (V) are shown to depend on heights above the galactic plane.
引用
收藏
页码：309 / 314
页数：6
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