银河系运动学参数的确定

THE DETERMINATION OF KINEMATIC PROPERTIES OF THE GALAXY

利用 2 0 2个太阳附近疏散星团的视向速度和自行观测资料 ,对太阳的运动和银河系的运动学参数进行了研究。其中 ,距离在 0 .5kpc到 2kpc之间的 12 8个疏散星团对平均太阳运动分量的解算结果是 (u0 ,v0 ,w0 ) =(- 13.8± 1.4 ,- 5 .0± 1.6 ,- 11.6± 2 .9)km/s ;Oort常数和银河系径向运动参数的解算结果分别为 (A ,B) =(16 .9± 1.1,- 11.6± 2 .6 )km·s- 1·kpc- 1及 (C ,D) =(2 .5± 1.1,- 2 .1± 0 .9)km·s- 1·kpc- 1。

Absolute proper motions and radial velocities of 202 open clusters in the solar vicinity are employed to investigate the solar motion and kinematic parameters of the Galaxy. Solar motion components, Oort constants and Galactic radial motion parameters are determined by 128 open clusters with r ⊙ from 0.5 to 2kpc, they are (u 0, v 0, w 0)=(-13.8±1.4,-5.0±1.6,-11.6±2.9)km/s, (A, B)=(16.9±1.1,-11.6±2.6)km·s -1 ·kpc -1 , (C, D)=(2.5±1.1,-2.1±0.9)km·s -1 ·kpc -1 , respectively.