We investigate some aspects of Galactic disc kinematics based on the data on open clusters from the current version of “The Homogeneous Catalog of the Main Parameters of Open Star Clusters” and from Gaia DR2. Based on the radial velocity and proper motion data for the clusters we determine the angular velocity of the Sun in the Galaxy as Ω₀ = 25.6 ± 1.2 km s^-1 kpc^-1. A new approximation of the Galactic rotation curve by a polynomial in inverse powers of galactocentric distances is constructed. We consider the influence of spiral density waves on the smoothed velocity field of the Galactic disc. The radial f_R = 4.6 ± 0.7 km s^-1 and tangential f_ϑ = 1.1 ± 0.4 km s^-1 amplitudes of the velocity field distortion are estimated from the radial dependences of the residual spatial velocity components of the clusters.

中文翻译：

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基于新版“开放星团参数同质目录”数据的开放星团运动学

我们基于最新版“开放星团主要参数的均匀目录”和Gaia DR2上的开放星团数据，研究银河系盘运动学的某些方面。基于该径向速度和适当的运动数据用于簇我们确定太阳的角速度在银河为Ω ₀ = 25.6±1.2公里S ^-1 KPC ^-1。构造了一个新的银河系旋转曲线的近似值，该多项式是半视距的反幂。我们考虑了螺旋密度波对银河盘平滑速度场的影响。径向f _R = 4.6±0.7 km s ^-1和切向f _ϑ根据簇的剩余空间速度分量的径向相关性，可以估算出= 1.1±0.4 km s ^-1的速度场失真幅度。