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Kinematics of the Galaxy from a Sample of Young Open Star Clusters with Data from the Gaia DR2 Catalogue

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Abstract

We have selected a sample of 326 young (log t < 8) open star clusters with the proper motions and distances calculated by various authors from Gaia DR2 data. The mean values of their line-of-sight velocities have also been taken from various publications. As a result of our kinematic analysis, we have found the following parameters of the angular velocity of Galactic rotation: Ω0 = 29.34 ± 0.31 km s−1 kpc−1, Ω′0 = −4.012 ± 0.074 kms−1 kpc−2, and Ω″0 = 0.779 ± 0.062 kms−1 kpc−3. The circular rotation velocity of the solar neighborhood around the Galactic center is V0 = 235 ± 5 km s−1 for the adopted Galactocentric distance of the Sun R0 = 8.0 ± 0.15 kpc. The amplitudes of the tangential and radial velocity perturbations produced by the spiral density wave are fθ = 3.8 ± 1.2 km s−1 and fR = 4.7 ± 1.0 km s−1, respectively; the perturbation wavelengths are λθ = 2.3 ± 0.5 kpc and λr = 2.2 ± 0.5 kpc for the adopted four-armed spiral pattern. The Sun’s phase in the spiral density wave is close to χ⊙ = −120° ± 10°.

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Authors and Affiliations

  1. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, St. Petersburg, 196140, Russia

    V. V. Bobylev & A. T. Bajkova

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  1. V. V. Bobylev
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  2. A. T. Bajkova
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Correspondence to V. V. Bobylev.

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Russian Text © V.V. Bobylev, A.T. Bajkova, 2019, published in Pis’ma v Astronomicheskii Zhurnal, 2019, Vol. 45, No. 3, pp. 151–162.

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Bobylev, V.V., Bajkova, A.T. Kinematics of the Galaxy from a Sample of Young Open Star Clusters with Data from the Gaia DR2 Catalogue. Astron. Lett. 45, 109–119 (2019). https://doi.org/10.1134/S1063773719030010

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  • DOI: https://doi.org/10.1134/S1063773719030010

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