天蝎座-半人马座OB关联的动力学
Kinematics of the Scorpius-Centaurus OB Association
摘要：
在古尔德带恒星的紫外线速度分布中，揭示了与天蝎座-半人马座星协的三个组成部分（LCC、UCL和US）的运动学特性有关的精细结构。我们已经能够确定这些群体的最有可能的成员，通过应用我们开发的分析恒星紫外线速度的二维概率密度函数的方法。已确定的结构组件的运动学分析表明，在一般情况下，质心运动的LCC，UCL和美国集团遵循古尔德带的运动特征，特别是其扩展。整个天蝎座-半人马座复合体具有适当的膨胀，其运动中心的角速度参数为46 ± 8 km/s/kpc，lo=-40 °，Ro=110 pc，据此估算了复合体的特征膨胀时间为21 ± 400万年。天蝎座-半人马座复合体的自转速度在星等上较低，测定不太可靠，并且明显依赖于数据质量。
英文摘要：
A fine structure related to the kinematic peculiarities of three components of the Scorpius-Centaurus association (LCC, UCL, and US) has been revealed in the UV-velocity distribution of Gould Belt stars. We have been able to identify the most likely members of these groups by applying the method of analyzing the two-dimensional probability density function of stellar UV velocities that we developed. A kinematic analysis of the identified structural components has shown that, in general, the center--of--mass motion of the LCC, UCL, and US groups follows the motion characteristic of the Gould Belt, notably its expansion. The entire Scorpius-Centaurus complex is shown to possess a proper expansion with an angular velocity parameter of 46+-8 km/s/kpc for the kinematic center with lo=-40 degrees and Ro=110 pc found. Based on this velocity, we have estimated the characteristic expansion time of the complex to be 21+-4 Myr. The proper rotation velocity of the Scorpius-Centaurus complex is lower in magnitude, is determined less reliably, and depends markedly on the data quality.
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