论文标题
Gaia DR2目录中T Tauri型星的Gould皮带尺度高度的估计
Estimation of the Gould Belt scale height from T Tauri type stars in the Gaia DR2 catalogue
论文作者
论文摘要
我们分析了在500 pc半径太阳能邻域中，大量年轻T牛里型星的空间和运动学特性，与古尔德带密切相关。已经确定了指数密度分布的以下参数：平均$（z_g）_ \ odot = -25 \ pm5 $ PC和比例高度$ h_g = 56 \ pm6 $ pc。我们提出了一种从样品中排除背景恒星的方法，这些方法相对于古尔德带的对称平面位于大高度。我们发现，整个恒星系统的扩展效果，$ k_g = 6 \ pm1 $ km s $^{ - 1} $ kpc $^{ - 1} $，主要由天蝎座 - 核协会的动态确定。我们表明，古尔德皮带的残余固有旋转的角速度可以达到$ω_g= 6.9 \ pm0.2 $ km s $ s $^{ - 1} $ kpc $^{ - 1} $，并且这种旋转与银河系旋转相反。
We analyze the spatial and kinematic properties of a large sample of young T Tauri type stars in a 500 pc radius solar neighborhood, closely related to the Gould belt. The following parameters of the exponential density distribution have been determined: the average $(z_G)_\odot=-25\pm5$ pc and scale height $h_G=56\pm6$ pc. We propose a method of excluding background stars from the samples, which are located at large heights with respect to the symmetry plane of the Gould belt. We discovered that the expansion effect for the entire star system, $K_G=6\pm1$ km s$^{-1}$ kpc$^{-1}$, is determined mainly by the dynamics of the Scorpius-Centaurus association. We show that the angular velocity of the residual intrinsic rotation of the Gould belt can reach $Ω_G=6.9\pm0.2$ km s$^{-1}$ kpc$^{-1}$ and that this rotation is opposite to the galactic rotation.
