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New Expansion Rate Estimate of the Scorpius–Centaurus Association Based on T Tauri Stars from the Gaia DR2 Catalog
Astronomy Reports ( IF 1 ) Pub Date : 2020-04-14 , DOI: 10.1134/s1063772920040022
V. V. Bobylev , A. T. Baykova

Abstract

The kinematic properties of the Scorpius–Centaurus association were studied using spatial velocities of approximately 700 young T Tauri stars. Their proper motions and trigonometric parallaxes were selected by Zari et al. from the Gaia DR2 catalog, and radial velocities were taken from various sources. The linear expansion coefficient’s new estimate of the association \(K = 39 \pm 2\) km/s/kpc is obtained by considering the influence of the galactic spiral density wave with an amplitude of radial disturbances \({{f}_{R}} = 5\) km/s and solar phase in the wave\( - 120^\circ \). The proper rotation of the association is shown to be small. The residual velocity ellipsoid of these stars has semimajor axes \({{\sigma }_{{1,2,3}}} = (7.72,1.87,1.74) \pm (0.56,0.37,0.22)\) km/s and is positioned at an angle \(12^\circ \pm 2^\circ \) to the galactic plane.



中文翻译:

基于Gaia DR2目录中的T Tauri星的Scorpius-Centaurus协会的新膨胀率估算

摘要

利用大约700颗T Tauri幼星的空间速度研究了Scorpius-Centaurus协会的运动学特性。Zari等人选择了它们的适当运动和三角视差。从Gaia DR2目录中获得,径向速度来自各种来源。线性膨胀系数对关联\(K = 39 \ pm 2 \) km / s / kpc的新估计是通过考虑具有径向扰动幅度\({{f} _ { R}} = 5 \) km / s和波\(-120 ^ \ circ \)中的太阳相位。关联的正确旋转显示为很小。这些恒星的剩余速度椭球具有半长轴\({{\ sigma __ {{1,2,3}}} = =(7.72,1.87,1.74)\ pm(0.56,0.37,0.22)\) km / s并以角度\(12 ^ \ circ \ pm 2 ^ \ circ \)到达银河平面。

更新日期:2020-04-23
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