Kinematics of Open Star Clusters Based on the Data of the New Version of the “Homogeneous Catalog of Open Cluster Parameters”
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 fR = 4.6 ± 0.7 km s-1 and tangential fϑ = 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.
Key wordsGalaxy kinematics and dynamics-open clusters and associations general
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This work was supported in part by the Ministry of Education and Science (the basic part of the State assignment, RK no. AAAA-A17-117030310283-7) and by the Act no. 211 of the Government of the Russian Federation, agreement no. 02.A03.21.0006.