朱紫^1，*， 沈鸣^2，

（  1、南京大学天文与空间科学学院，南京 210093；       2、中国科学院国家天文台，北京 10012；  ）

摘要： 基于恒星视向速度和依巴谷自行观测数据，提出一种纯运动学方法来测定太阳-银心距的模型。分别采用银河系3类薄盘星族天体（O-B5型恒星、经典造父变星以及银河系疏散星团）为样本，研究了银河系结构和运动学问题。利用银河系轴对称的圆轨道运动近似理论，分别由O-B5型星资料测得R0=8.25±0.79 kpc、由经典造父变星数据得R0=7.98±0.79 kpc以及利用疏散星团观测得R0=8.03±0.70 kpc。所得结果均与目前被认为的最优测定值相符。
关键词： 天体测量；银河系盘；银河系基本参数；运动学和动力学；太阳临近区

ZHU Zi^1,*， SHEN Ming^2,

（  1、School of Astronomy and Space science, Nanjing University, Nanjing 210093；       2、National astronomical Observatries, Chinese Academy of Sciences, Beijing 100012；  ）

Abstract： Based on the radial velocity data and the Hipparcos proper motions, a new determination of the Galactocentric distance is presented via a purely kinematic model. Three subgroups of Galactic thin disk components (O-B5 stars, classical Cepheids and the Galactic open clusters) are selected to trace the local structure and kinematics of the Galactic disk. Adopting the approximation of axisymmetric circular rotation, the Sun's distance to the Galactic center is derived, R0=8.25±0.79 kpc based on O-B5 stars, R0=7.98±0.79 kpc based on Galactic Cephieds and R0=8.03±0.70 kpc using open clusters, all of which are in excellent agreement with the current-best estimate of the Galactocentric distance.
Keywords： Astrometry; Galaxy: disk; Galaxy fundamental parameters; Galaxy: kinematics and dynamics; solar neighborhood

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