Kinematic Properties of Young Intermediate- and Low-Mass Stars from the Gaia DR2 Catalogue

Abstract

We have studied the kinematic properties of young pre-main-sequence stars. We have selected these stars based on data from the Gaia DR2 catalogue by invoking a number of photometric infrared surveys. Using 4564 stars with parallax errors less than 20\%, we have found the following parameters of the angular velocity of Galactic rotation: ${\Omega }_0=28.84\pm 0.10$ km s${}^{-1}$ kpc${}^{-1}$, ${\Omega }_0^{{}^{\prime }}=-4.063\pm 0.029$ km s${}^{-1}$ kpc${}^{-2}$ and ${\Omega }_0^{{}^{\prime \prime }}=0.766\pm 0.020$ km s${}^{-1}$ kpc${}^{-3}$, where the Oort constants are $A=16.25\pm 0.33$ km s${}^{-1}$ kpc${}^{-1}$ and $B=-12.58\pm 0.34$ km s${}^{-1}$ kpc${}^{-1}$. The circular rotation velocity of the solar neighborhood around the Galactic center is $V_0=230.7\pm 4.4$ km s${}^{-1}$ for the adopted Galactocentric distance of the Sun $R_0=8.0\pm 0.15$ kpc. The residual velocity dispersion for the stars considered is shown to be low, suggesting that they are extremely young. The residual velocity dispersion averaged over three coordinates is $\sim$11 km s${}^{-1}$ for Herbig Ae/Be stars and $\sim$7 km s${}^{-1}$ for T Tauri stars.

12 pages, 3 figures and 2 tables

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