Kinematic analysis of solar-neighborhood stars based on RAVE4 data

We consider stars with radial velocities, proper motions, and distance estimates from the RAVE4 catalogue. Based on a sample of more than 145 000 stars at distances r < 0.5 kpc, we have found the following kinematic parameters: ( U, 1pt V, 1pt W )_ = (9.12, 20.80, 7.66) ± (0.10, 0.10, 0.08) km s−1, Ω0 = 28.71 ± 0.63 km s−1 kpc−1, and Ω0 ’ = −4.28 ± 0.11 km s−1 kpc−2. This gives the linear rotation velocity V 0 = 230 ± 12 km s−1 (for the adopted R 0 = 8.0 ± 0.4 kpc) and the Oort constants A = 17.12 ± 0.45 km s−1 kpc−1 and B = −11.60 ± 0.77 km s−1 kpc−1. The 2D velocity distributions in the UV, UW, and VW planes have been constructed using a local sample, r < 0.25 kpc, consisting of ~47 000 stars. A difference of the UV velocity distribution from the previously known ones constructed from a smaller amount of data has been revealed. It lies in the fact that our distribution has an extremely enhanced branch near the Wolf 630 peak. A previously unknown peak at (U, V) = (−96, −10) km s−1 and a separate new feature in the Wolf 630 stream, with the coordinates of its center being (U, V) = (30, −40) km s−1, have been detected.