论文标题
Cygnus ob2的速度结构
The velocity structure of Cygnus OB2
论文作者
论文摘要
研究了Cygnus OB2关联的运动学结构。在该地区内的任何规模上都找不到扩张或收缩的证据。发现彼此之间的$ \ sim $ 0.5 parsec的恒星的速度比随机机会所预期的要相似，因此可以得出结论，这些尺度上存在速度子结构。在较大的尺度下，找不到速度子结构。我们建议，尽管该地区整体没有绑定，但在$ \ sim $ 0.5 parsecs的尺度上存在绑定的子结构。我们进一步建议，均已删除了在比例> 0.5 parsecs上存在的任何速度子结构。然后将这项研究的结果与Cygnus OB2的其他运动学研究的结果进行了比较。
The kinematic structure of the Cygnus OB2 association is investigated. No evidence of expansion or contraction is found at any scale within the region. Stars that are within $\sim$ 0.5 parsecs of one another are found to have more similar velocities than would be expected by random chance, and so it is concluded that velocity substructure exists on these scales. At larger scales velocity substructure is not found. We suggest that bound substructures exist on scales of $\sim$ 0.5 parsecs, despite the region as a whole being unbound. We further suggest that any velocity substructure that existed on scales > 0.5 parsecs has been erased. The results of this study are then compared to those of other kinematic studies of Cygnus OB2.
