Cepheid Kinematics and the Galactic Warp

Abstract

The space velocities of 200 long-period ($P>5$ days) classical Cepheids with known proper motions and line-of-sight velocities whose distances were estimated from the period--luminosity relation have been analyzed. The linear Ogorodnikov-Milne model has been applied, with the Galactic rotation having been excluded from the observed velocities in advance. Two significant gradients have been found in the Cepheid velocities, $\partial W/\partial Y=-2.1\pm 0.7$ km s${}^{-1}$ kpc${}^{-1}$ and $\partial V/\partial Z=27\pm 10$ km s${}^{-1}$ kpc${}^{-1}$. In such a case, the angular velocity of solid-body rotation around the Galactic $X$ axis directed to the Galactic center is $-15\pm 5$ km s${}^{-1}$ kpc${}^{-1}$.

9 pages, 3 figures, 1 table

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• Kinematic Properties of Open Star Clusters with Data from the Gaia DR2 Catalogue
• 3-D kinematics of classical Cepheids according to Gaia, EDR3 catalog
• Analysis of Galactic Rotation from Masers based on a Nonlinear Oort Model
• Estimation of the Radial Scale Length and Vertical Scale Height of the Galactic Thin Disk from Cepheids
• Three-Dimensional Kinematics of Classical Cepheids
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