Astronomy Letters

, Volume 45, Issue 6, pp 331–340 | Cite as

Galactic Rotation Based on OB Stars from the Gaia DR2 Catalogue

  • V. V. BobylevEmail author
  • A. T. Bajkova


We have studied a sample containing ~6000 OB stars with proper motions and trigonometric parallaxes from the Gaia DR2 catalogue. The following parameters of the angular velocity of Galactic rotation have been found: Ω0 = 29.70 ± 0.11 km s-1 kpc-1, Ω'0 = -4.035 ± 0.031 km s-1 kpc-2, and Ω 0 = 0.620 ± 0.014 km s-1 kpc-3. The circular rotation velocity of the solar neighborhood around the Galactic center is V0 = 238 ± 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 = 4.4 ± 1.4 kms-1 and fR = 5.1 ± 1.2 kms-1, respectively; the perturbation wavelengths are λθ = 1.9 ± 0.5 kpc and λR = 2.1 ± 0.5 kpc for the adopted four-armed spiral pattern. The Sun's phase in the spiral density wave is χ = -178° ± 12°.


OB stars Galactic rotation spiral density wave 


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We are grateful to the referee for useful remarks that contributed to an improvement of the paper.


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© Pleiades Publishing, Inc. 2019

Authors and Affiliations

  1. 1.Pulkovo Astronomical ObservatoryRussian Academy of SciencesSt. PetersburgRussia

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