摘要
利用视向速度资料和依巴谷星表的自行资料，研究了经典造父变星的银河系运动学问题．采用Ｏｇｏｒｏｄｎｉｋｏｖ－Ｍｉlnｅ三维运动学模型，获得银河系旋转速度Ｖ０＝２４０．５±１０．２ｋｍ／ｓ（取太阳至银心距离为８．５ｋｐｃ）同时发现，在太阳附近沿银河系旋转方向存在一种收缩运动，其值((V(/(()／Ｒ＝－２．６０±１．０７ｋｍｓ－１kｐｃ－１．本文分析了产生这种收缩运动的原因．另外，得出太阳运动速度Ｓ＝１８．７±０．８６ｋｍ／ｓ向点＝５４．４°±２．９°＝＋２６．６°±２．
n the bajsis of radial velocity and Hipparcos proper motion data, we have analyzedthe galactic kinematics of classical Cepheids. Using the 3-D Ogorodnikov-Mime model wehave determined the rotational velocity of the Galaxy to be VO = 240.5± 10.2km/s, onassuming a glactoceatric distance of the Sun of Ro =8.5 kpc. The results clearly indicate acontracting motion in the solar neighbourhood of (/)/R =-2.60±1.07 km s-1 kpc-1，along the direction of galactic rotation. Possible reason for this motion is discussed. Thesolar motion found here is S=18.78±0.86km/s in the direction =54.4°±2.9° and= +26.6° ±2.6°.
基金
国家自然科学基金
教育部留学回国人员科研启动基金
