Kinematics of nearby subdwarfs

被引：5

作者：

Fuchs, B ^{[1
]}

Jahreiss, H ^{[1
]}

Wielen, R ^{[1
]}

机构：

[1] Astron Rechen Inst, D-69120 Heidelberg, Germany

来源：

ASTROPHYSICS AND SPACE SCIENCE | 1999年 / 265卷 / 1-4期

关键词：

Proper Motion; Galactic Center; Thick Disk; Kinematical Behaviour; Halo Star;

D O I：

10.1023/A:1002190906018

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A sample of subdwarfs with accurate space velocities and standarized metallicities is presented. This was constructed by combining Hipparcos parallaxes and proper motions with radial velocities and metallicities from Carney et al. (1994; CLLA). The accurate Hipparcos parallaxes lead to an - upward - correction factor of 11% of the photometric distance scale of CLLA. The kinematical behaviour of the subdwarfs is discussed in particular in relation to their metallicities. Most of the stars turn out to be thick disk stars, but the sample contains also many genuine halo stars. While the extreme metal poor halo does not rotate, a population of subdwarfs with metallicities in the range -1.6 < [Fe/H] < -1.0 dex appears to rotate around the galactic center with a mean rotation speed of about 100 km s(-1).

引用

页码：175 / 178

页数：4