双胞胎喜欢被看到：影响光谱选择双星的观测偏差
Twins like to be seen: Observational biases affecting spectroscopically selected binary stars
摘要：
当两颗双星的质量相似时，大质量双星会经历不同的演化（“双胞胎”），因此双胞胎双星的丰度对于理解广泛的天体物理现象非常重要。我们重新考虑了Pinsonneault & Stanek（2006）的结果，他们认为大部分双星具有几乎相等的质量分量;我们发现他们的数据意味着相对较少的这种“双胞胎”。“我们认为，双线光谱双星的样本偏向于具有几乎相等亮度分量的系统。我们提出了这种偏见的蒙特卡罗模型，它同时解释了Pinsonneault & Stanek（2006）的未进化双星中双胞胎的丰富性，以及它们进化系统中双胞胎的缺乏。在考虑了偏差后，我们发现它们观测到的质量比可能与各种固有分布一致，包括平坦分布或Salpeter分布。我们的结论是，Pinsonneault & Stanek（2006）中观察到的过多的双胞胎并不能反映双星的真实数量，我们简要讨论了缺乏双胞胎的天体物理意义。
英文摘要：
Massive binary stars undergo qualitatively different evolution when the two components are similar in mass ('twins'), and the abundance of twin binaries is therefore important to understanding a wide range of astrophysical phenomena. We reconsider the results of Pinsonneault & Stanek (2006), who argue that a large proportion of binary stars have nearly equal-mass components; we find that their data imply a relatively small number of such 'twins.' We argue that samples of double-lined spectroscopic binaries are biased towards systems with nearly equal-brightness components. We present a Monte-Carlo model of this bias, which simultaneously explains the abundance of twins in the unevolved binaries of Pinsonneault & Stanek (2006), and the lack of twins in their evolved systems. After accounting for the bias, we find that their observed mass ratios may be consistent with a variety of intrinsic distributions, including either a flat distribution or a Salpeter distribution. We conclude that the observed overabundance of twins in Pinsonneault & Stanek (2006) does not reflect the true population of binaries, and we briefly discuss the astrophysical implications of the lack of twins.
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