不寻常的宽双星：它们是宽的还是不寻常的？
Unusually Wide Binaries: Are They Wide or Unusual?
摘要：
我们描述了一个天体测量和光谱运动，以确认青年和协会的候选人广泛的同伴在金牛座和上斯科的完整样本。我们的调查发现了15个新的双星系统（3个在金牛座，12个在上斯科），在所有已知的质量为2.5-0.012 Msun的成员中，距离为3-30”（500-5000 AU）。这两个区域的49个广泛系统的总样本仅符合实地多重性调查的一些预期。质量较大的恒星有较高频率的宽联星伴星，并且在亚恒星区域附近的宽联星系统明显缺乏。然而，分离分布似乎是对数平坦的，而不是在外地下降，和质量比分布更偏向于类似质量的同伴比IMF或现场G矮星分布。最大的分离也没有显示出在小于5000 AU的极限，直到任何宽的双星在系统质量约0.3 Msun时突然停止形成。我们将这一结果归因于大多数场系统发生的出生后动力学雕刻;我们的双星系统将完好无损地逃到场中，但大多数场星形成于更密集的星团中，而不是。总而言之，只有总质量小于0.3 Msun的宽双星系统才显得“异常宽”。
英文摘要：
We describe an astrometric and spectroscopic campaign to confirm the youth and association of a complete sample of candidate wide companions in Taurus and Upper Sco. Our survey found fifteen new binary systems (3 in Taurus and 12 in Upper Sco) with separations of 3-30" (500-5000 AU) among all of the known members with masses of 2.5-0.012 Msun. The total sample of 49 wide systems in these two regions conforms to only some expectations from field multiplicity surveys. Higher-mass stars have a higher frequency of wide binary companions, and there is a marked paucity of wide binary systems near the substellar regime. However, the separation distribution appears to be log-flat, rather than declining as in the field, and the mass ratio distribution is more biased toward similar-mass companions than the IMF or the field G dwarf distribution. The maximum separation also shows no evidence of a limit at <5000 AU until the abrupt cessation of any wide binary formation at system masses of ~0.3 Msun. We attribute this result to the post-natal dynamical sculpting that occurs for most field systems; our binary systems will escape to the field intact, but most field stars are formed in denser clusters and do not. In summary, only wide binary systems with total masses <0.3 Msun appear to be "unusually wide".
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。
