Analysis of the Distance Scales by Cepheids from the Gaia EDR3 Catalogue Data

We study the kinematics of a sample classical Cepheids younger than 120 Myr. For these stars, estimates distances taken from Skowron et al., which are based on period–luminosity relation, and line-of-sight velocities proper motions Gaia catalog available. There also distance derived trigonometric parallaxes contained in ERD3 catalog. A method, relies comparison first-order derivative Galactic rotation angular velocity, showed need to lengthen scales determined by al. about 10%. This conclusion was confirmed direct predicted using parallaxes. With taking into account this result, we obtained new parameters spiral density wave.