Abstract

We study the dependence of the kinematic properties of the subsystems of Galactic open clusters on their ages. It was found that the angular velocity of Galactic rotation in the solar vicinity decreases to 25.6 km s\({}^{-1}\) kpc\({}^{-1}\) for clusters older than 600 Myrs. According to the rotation curves of the Galaxy for different age intervals at a galactocentric distance of 6.0 to 13.0 kpc, it is found that older open clusters rotate much more slowly than young and middle-aged clusters. The rotation curve decreases with increasing galactocentric distance in the entire distance interval under consideration. We can observe the separation of open clusters into thick and thin disk objects. A near-sinusoidal dependence of the radial cluster velocity component on galactocentric distance is obtained for distances ranging from 6.0 to 13.0 kpc. No dependence of the vertical velocity component on galactocentric distance is found.

中文翻译：

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基于疏散星团数据的银盘运动学

摘要

我们研究银河疏散星团子系统的运动学特性对其年龄的依赖性。发现太阳附近银河系自转角速度降低至25.6 km s \({}^{-1}\)  kpc \({}^{-1}\)对于年龄超过 600 Myrs 的集群。根据银心距6.0~13.0kpc不同年龄区间的银河自转曲线发现，较老的疏散星团的自转速度比年轻和中年星团慢得多。在所考虑的整个距离区间内，旋转曲线随着星系中心距离的增加而减小。我们可以观察到疏散星团分离成厚盘物体和薄盘物体。对于 6.0 到 13.0 kpc 的距离，获得了径向簇速度分量对星系中心距离的近正弦依赖性。没有发现垂直速度分量与星系中心距离的相关性。