Kinematics of the Galactic Disk Based on Open Cluster Data

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  kpc for clusters older than 600 Myrs. According to the rotation curves of the Galax...

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Bibliographic Details
Published in:Astrophysical bulletin 2023-06, Vol.78 (2), p.134-140
Main Author: Popova, M. E.
Format: Article
Language:English
Subjects:
Angular velocity
Astronomy
Astrophysics and Cosmology
Galactic clusters
Galactic disk
Galactic rotation
Kinematics
Open clusters
Physics
Physics and Astronomy
Subsystems
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Summary: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  kpc 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.
ISSN:1990-3413
1990-3421
DOI:10.1134/S1990341323020049