USco1606-1935：一个异常宽的低质量三重系统？
USco1606-1935: An Unusually Wide Low-Mass Triple System?
摘要：
我们介绍了USCO 160611.9 -193532 AB的测光、天体测量和光谱观测，USCO 160611.9 -193532 AB是附近OB协上天蝎座中的一个候选超宽（~1600 AU）、低质量（M_tot~0.4 M_sun）多重系统。我们的结论是，这两个组件是年轻的，共同运动的协会成员，我们还提出了高分辨率的观测表明，主要本身是一个密切的二元系统。如果Aab分量和B分量是引力束缚的，那么这个系统将属于年轻的多重系统的一小类，与类似质量的场系统相比，这些系统具有异常宽的分离。然而，我们证明，物理协会不能假设纯粹的概率的理由，在这个分离范围内的任何个别候选系统。对星协的两点关联函数的分析表明，至少有一对低质量星协成员在投影中相隔<15”的概率很大（25%），因此对上斯科的宽二进制种群的分析需要对所有宽系统进行系统搜索;另一对这样的成员的检测将在98%的置信水平下表示过量。
英文摘要：
We present photometric, astrometric, and spectroscopic observations of USco160611.9-193532 AB, a candidate ultrawide (~1600 AU), low-mass (M_tot~0.4 M_sun) multiple system in the nearby OB association Upper Scorpius. We conclude that both components are young, comoving members of the association; we also present high-resolution observations which show that the primary is itself a close binary system. If the Aab and B components are gravitationally bound, the system would fall into the small class of young multiple systems which have unusually wide separations as compared to field systems of similar mass. However, we demonstrate that physical association can not be assumed purely on probabilistic grounds for any individual candidate system in this separation range. Analysis of the association's two-point correlation function shows that there is a significant probability (25%) that at least one pair of low-mass association members will be separated in projection by <15", so analysis of the wide binary population in Upper Sco will require a systematic search for all wide systems; the detection of another such pair would represent an excess at the 98% confidence level.
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