利用新编依巴谷天体测量资料研究银河系运动  

A Kinematical Study for the Galaxy Based on the Revised Hipparcos Astrometric Data

作　　者：沈鸣[1] 张鸿[1] 

机构地区：[1]南京大学天文系

出　　处：《天文学报》2009年第2期213-223,共11页Acta Astronomica Sinica

基　　金：国家自然科学基金(10673005)资助项目

摘　　要：根据最近发表的新编依巴谷星表数据,重新研究了经典造父变星周光关系零点问题.利用运动学模型对自行数据和视向速度分别拟合奥尔特常数及本地静止标准的旋转速度,得到太阳的银心距R_0=8.0±0.8kpc.从太阳附近的旋转曲线,发现银河系盘的引力势具有弱椭圆分布的迹象.通过一个简单的非对称模型,得到太阳附近盘引力势的椭率∈(R_0)=0.067±0.036,其短轴指向φb=32°±15°.On the basis of the revised Hipparcos data recently released, the zero-point of the PL relation for classical cepheids was reexamined. Fitting proper motion and radial velocity data via an axis symmetric model, Oort constants and circular rotation velocity of the LSR were calculated to obtain Galactocentric distance of the sun, R0= 8.0±0.8kpc. From the rotation curve in solar neighborhood, the existence of weak ellipticity of the Galactic potential was found. Adopting a simple asymmetric model, we obtained the ellipticity ε（R0） = 0.067± 0.036 at the sun, while the minor axis pointing to φb=32°±15°.

关 键 词：天体测量 天体(星)表 银河系 盘 变星 造父变星 银河系 结构 

分 类 号：P126[天文地球—天体测量]