The Galaxy Kinematics from OB Stars with Proper Motions from the Gaia DR1 Catalog

摘要

We consider two previously studied samples of OB stars with differentdistance scales. The first one consists of 98 massive spectroscopic binarystars with photometric distances, and the second one consists on 140 OB starswith the distances determined along the lines of interstellar calcium. The OBstars are located at distances up to 7 kpc from the Sun. They are identifiedwith the Gaia DR1 catalog. It is shown that the use of the proper motions,taken from the Gaia DR1 catalog, allows to reduce random errors ofdetermination of the Galactic rotation parameters in comparison with thepreviously known ones. From the analysis of 208 OB stars from the Gaia DR1catalog with proper motions and parallaxes with relative errors less than 200%we found the Galactic kinematic parameters. In addition the Galactic rotationparameters were obtained from only line-of-sight velocities of the same stars.From the comparison of the two values of \Omega^{'}_0 a distance scale of theGaia DR1 catalog was determined as a value close to unit, namely 0.96. From 238OB-stars of the united sample with photometric distances for stars of the firstsample and distances in the calcium scale for stars of the second sample,line-of-sight velocities and proper motions from the Gaia DR1 catalog, werefound the following kinematic parameters:(U,V,W)_\odot=(8.19,9.28,8.79)+/-(0.74,0.92,0.74) km/s, \Omega_0=31.53+/-0.54km/s/kpc, \Omega^{'}_0=-4.44+/-0.12 km/s/kpc^2, \Omega^{"}_0=0.706+/-0.100km/s/kpc^3, here Oort constants: A=-17.77+/-0.46 km/s/kpc, B=13.76+/-0.71km/s/kpc and V_0=252+/-8 km/s.