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arXiv 2007.05268astro-ph.GA
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根据盖亚DR2星表中金牛座T型星估算古尔德带标度高度

Estimation of the Gould Belt scale height from T Tauri type stars in the Gaia DR2 catalogue

V. V. Bobylev, A. T. Bajkova

摘要:

我们分析的空间和运动学性质的一个大样本的年轻的金牛座T型恒星在500 pc半径的太阳附近,密切相关的古尔德带。已确定指数密度分布的以下参数:平均$(z_G)_\odot=-25\pm5$ pc和鳞片高度$h_G=56\pm6$ pc。我们提出了一种方法,从样品中排除背景恒星,这是位于相对于古尔德带的对称平面在很大的高度。我们发现整个恒星系统的膨胀效应,$K_G=6\pm1$ km s $^{-1}$ kpc $^{-1}$,主要由天蝎座-人马座星协的动力学决定。我们表明,古尔德带的剩余内禀自转角速度可达$Ω_G=6.9\pm0.2$ km s $^{-1}$ kpc $^{-1}$,并且这种自转与银河系自转方向相反.

英文摘要:

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.

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