标题： 基于盖亚DR2目录的年轻中期和低质量恒星的运动学性质 显示英文标题

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

摘要： 我们研究了年轻前主序星的运动学性质。 我们根据盖亚DR2目录中的数据，并利用多个光度红外巡天，选择了这些恒星。 利用4564颗视差误差小于20%的恒星，我们得到了银河系旋转角速度的以下参数：$\Omega_0 =28.84\pm0.10$ km s$^{-1}$ kpc$^{-1}$， $\Omega^{'}_0=-4.063\pm0.029$ km s$^{-1}$ kpc$^{-2}$和 $\Omega^{''}_0=0.766\pm0.020$ km s$^{-1}$ kpc$^{-3}$，其中奥尔特常数为$A=16.25\pm0.33$ km s$^{-1}$ kpc$^{-1}$和$B=-12.58\pm0.34$ km s$^{-1}$ kpc$^{-1}$。 太阳邻域绕银河系中心的圆周旋转速度为$V_0=230.7\pm4.4$km s$^{-1}$，此处采用太阳到银心的距离$R_0=8.0\pm0.15$kpc。所考虑的恒星剩余速度弥散较低，表明它们极为年轻。对于Herbig Ae/Be星，三个坐标方向上平均的剩余速度弥散为$\sim$11 km s$^{-1}$；而对于T Tauri星，则为$\sim$7 km s$^{-1}$。 显示英文摘要

摘要： 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: $\Omega_0 =28.84\pm0.10$ km s$^{-1}$ kpc$^{-1}$, $\Omega^{'}_0=-4.063\pm0.029$ km s$^{-1}$ kpc$^{-2}$ and $\Omega^{''}_0=0.766\pm0.020$ km s$^{-1}$ kpc$^{-3}$, where the Oort constants are $A=16.25\pm0.33$ km s$^{-1}$ kpc$^{-1}$ and $B=-12.58\pm0.34$ km s$^{-1}$ kpc$^{-1}$. The circular rotation velocity of the solar neighborhood around the Galactic center is $V_0=230.7\pm4.4$ km s$^{-1}$ for the adopted Galactocentric distance of the Sun $R_0=8.0\pm0.15$ 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.