论文标题
GAIA DR2目录的年轻中间和低质量星的运动学特性
Kinematic Properties of Young Intermediate- and Low-Mass Stars from the Gaia DR2 Catalogue
论文作者
论文摘要
我们研究了年轻的预序列恒星的运动学特性。我们通过调用许多光度红外调查，根据GAIA DR2目录中的数据选择了这些恒星。使用4564颗恒星少于20 \％，我们找到了以下旋转角速度的参数：$ω__0= 28.84 \ pm0.10 $ km s $ s $ s $^{ - 1} $ s $^{ - 1} $ kpc $^{ - 2} $和$ω^{'} _ 0 = 0.766 \ pm0.020 $ km s $ s $^{ - 1} $ kpc $^{ - 3} $ kpc $^{ - 1} $和$ b = -12.58 \ pm0.34 $ km s $^{ - 1} $ kpc $^{ - 1} $。银河中心周围太阳能社区的圆形旋转速度为$ v_0 = 230.7 \ pm4.4 $ km s $^{ - 1} $，用于所采用的阳光的半乳酸距离$ r_0 = 8.0 = 8.0 \ pm0.15 $ kpc。所考虑的恒星的残留速度分散液被证明很低，表明它们非常年轻。在三个坐标上平均的剩余速度分散量为$ \ sim $ 11 km s $^{ - 1} $，用于Herbig Ae/Be Star/be Stars和$ \ sim $ \ sim $ 7 km S $^{ - 1} $用于Tauri Stars。
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: $Ω_0 =28.84\pm0.10$ km s$^{-1}$ kpc$^{-1}$, $Ω^{'}_0=-4.063\pm0.029$ km s$^{-1}$ kpc$^{-2}$ and $Ω^{''}_0=0.766\pm0.020$ 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.
