arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.04124astro-ph.GA
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盖亚DR2星表中前主序星的动力学

Kinematics of pre-main sequence stars from the Gaia DR2 catalog

V. V. Bobylev, A. T. Bajkova

摘要:

研究了尚未达到主序星阶段的年轻恒星的运动学性质。这些恒星的选择最近由Marton et al.(2019)和Vioque et al.(2020)根据Gaia DR 2目录使用一些光度红外测量进行。我们确定了银河系的自转参数和剩余速度椭球的参数。用4431颗恒星测得的太阳区域绕银河系中心的自转线速度为V_0=229.1 ± 4.4km/s。从低质量恒星(T Tau型)中可以得到以下剩余速度的椭球参数:$σ_{1,2,3}=(9.45,6.99,6.61)\pm(0.94,0.43,0.32)$ km/s。对于中等质量的恒星(赫比格Ae/Be星),它们的值要稍大一些,即$σ_{1,2,3}=(13.67,9.25,7.26)\pm(2.40,2.44,0.88)$ km/s。两个星表中的遥远恒星都很好地跟踪了本地旋臂。对于1212颗恒星,局部旋臂的俯仰角的新估计等于i=-8.9+-0.1度。

英文摘要:

The kinematic properties of young stars that have not yet reached the stage of the main sequence are studied. The selection of these stars was recently carried out by Marton et al. (2019) and Vioque et al. (2020) according to the Gaia DR2 catalog using a number of photometric infrared surveys. We have determined the rotation parameters of the Galaxy and the parameters of the ellipsoids of the residual velocities. The linear velocity of the circular rotation of a solar region around the center of the Galaxy, found using 4431 stars, is equal to V_0=229.1+-4.4 km/s. The following ellipsoid parameters of their residual velocities are found from low-mass stars (of type T Tau): $σ_{1,2,3}=(9.45,6.99,6.61)\pm(0.94,0.43,0.32)$ km/s. For stars of intermediate masses (Herbig Ae/Be stars), their values turned out to be somewhat larger $σ_{1,2,3}=(13.67,9.25,7.26)\pm(2.40,2.44,0.88)$ km/s. Distant stars from both Catalogs trace the local spiral arm well. For 1212 stars, a new estimate of the pitch angle of the Local spiral arm is equal to i=-8.9+-0.1 deg.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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