Abstract

The spatial and kinematic properties of a large sample of young T Tauri stars from the solar neighborhood 500 pc in radius have been studied. The following parameters of the position ellipsoid have been determined from the most probable members of the Gould Belt: its sizes are \(350\times 270\times 87\) pc and it is oriented at an angle of \(14^{\circ}\pm 1^{\circ}\) to the Galactic plane with a longitude of the ascending node of \(297^{\circ}\pm 1^{\circ}\). An analysis of the motions of stars from this sample has shown that the residual velocity ellipsoid with principal semiaxes \(\sigma_{1,2,3}=(8.87,5.58,3.03)\pm(0.10,0.20,0.04)\) km s\({}^{-1}\) is oriented at an angle of \(22\pm 1^{\circ}\) to the Galactic plane with a longitude of the ascending node of \(298^{\circ}\pm 2^{\circ}\). It has been established that much of the expansion effect (kinematic \(K\) effect) typical for Gould Belt stars, 5–6 km s\({}^{-1}\) kpc\({}^{-1}\), can be explained by the influence of a Galactic spiral density wave with a radial perturbation amplitude \(f_{R}\sim 5\) km s\({}^{-1}\).

中文翻译：

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Gaia DR2目录中接近太阳的T Tauri恒星的运动学

摘要

研究了来自太阳半径500 pc附近的大量T陶里星T的年轻恒星的空间和运动学特性。位置椭球的以下参数是从古尔德带最可能的成员中确定的：其尺寸为\（350 \乘以270 \乘以87 \） pc，并且定向为\（14 ^ {\ circ } \ pm 1 ^ {\ circ} \）到银河平面，并以\（297 ^ {\ circ} \ pm 1 ^ {\ circ} \）的上升节点经度表示。对来自此样本的恒星运动的分析表明，具有主半轴\（\ sigma_ {1,2,3} =（8.87,5.58,3.03）\ pm（0.10,0.20,0.04）\）的剩余速度椭球km s \（{} ^ {-1} \）定向为\（22 \ pm 1 ^ {\ circ} \）到银河平面，且其上升节点的经度为\（298 ^ {\ circ} \ pm 2 ^ {\ circ} \）。已经确定，在5–6 km s \（{} ^ {-1} \） kpc \（{} ^ {-1）的情况下，古尔德带恒星通常具有许多膨胀效应（运动\（K \）效应）} \）可以用具有径向摄动幅度\（f_ {R} \ sim 5 \） km s \（{} ^ {-1} \）的银河系螺旋密度波的影响来解释。