论文标题
基于Gaia DR2目录的T Tauri星星星星的新扩张率估计
New Expansion Rate Estimate of the Scorpius-Centaurus Association Based on T Tauri Stars from the Gaia DR2 Catalog
论文作者
论文摘要
使用大约700个年轻T牛里星的空间速度研究了天蝎座 - 库鲁斯关联的运动学特性。 Zari等人选择了它们的适当运动和三角票数。从Gaia DR2目录中，径向速度从各种来源获取。线性扩展系数的新估计值$ k = 39 \ pm2 $ km/s/kpc是通过考虑带有径向放射性干扰的银河螺旋密度波的影响来获得的。该关联的正确旋转显示为小。这些恒星的剩余速度椭圆形的椭圆形有semimajor轴$σ_{1,2,3} =（7.72,1.87,1.74）\ pm（0.56,0.37,0.22）$ km/s，并以$ 12 \ pm2^\ pm2^\ cirp $ cirp $ to palactic the palactic the palactic the palactic the palactic the palactic the palactic。
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 coefficients new estimate of the association $K=39\pm2$ 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 $σ_{1,2,3}=(7.72,1.87,1.74)\pm(0.56,0.37,0.22)$ km/s and is positioned at an angle $12\pm2^\circ$ to the galactic plane.
