Galactic Rotation Based on OB Stars from the Gaia DR2 Catalogue

Abstract

We have studied a sample containing about 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: ${\Omega }_0=29.70\pm 0.11$ km s${}^{-1}$ kpc${}^{-1}$, ${\Omega }_0^{\prime }=-4.035\pm 0.031$ km s${}^{-1}$ kpc${}^{-2}$, and ${\Omega }_0^{\prime \prime }=0.620\pm 0.014$ km s${}^{-1}$ kpc${}^{-3}$. The circular rotation velocity of the solar neighborhood around the Galactic center is $V_0=238\pm 5$ km s${}^{-1}$ for the adopted Galactocentric distance of the Sun $R_0=8.0\pm 0.15$ kpc. The amplitudes of the tangential and radial velocity perturbations produced by the spiral density wave are $f_{\theta }=4.4\pm 1.4$ km s${}^{-1}$ and $f_R=5.1\pm 1.2$ km s${}^{-1}$, respectively; the perturbation wavelengths are ${\lambda }_{\theta }=1.9\pm 0.5$ kpc and ${\lambda }_R=2.1\pm 0.5$ kpc for the adopted four-armed spiral pattern. The Sun's phase in the spiral density wave is ${\chi }_{\odot }=-178^{\circ }\pm 12^{\circ }$.

arXiv comment14 pages, 2 tables, 4 figures. arXiv admin note: substantial text overlap with arXiv:1903.09313, arXiv:1904.12686, arXiv:1809.10512, arXiv:1609.08341

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• Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions
• Search for OB associations in {\sl Gaia} early Data Release 3
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