Finding binary star fractions in any distribution

Finding binary star fractions in any distribution
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寻找任意分布中的双星分数

DOI:
10.1093/mnras/stz1939
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发表时间:
2019
影响因子:
4.8
通讯作者:
Akter S
Akter S
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Akter S

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候选视觉双星系统通常是通过识别比偶然预期距离更近的两颗恒星来发现的。然而,在具有非平凡密度分布的区域中,恒星之间的“随机”距离由于背景分布以及双星的存在而变化。我们表明,当不存在二元数据时,对于任何基础密度分布,到最近和第十个最近邻的距离比率的分布 d1/d10 始终可以很好地近似为均值 0.2-0.3 和方差 0.16-0.19 的高斯分布。二元数据的引入导致一些(或全部)最近邻随机变得比预期更接近,从而向分布中引入一个分量,其中 d1/d10 远低于预期。我们展示了如何使用简单的单高斯或双高斯拟合 d1/d10 分布来快速、简单地找到任何基础密度分布中的二元分数。
Candidate visual binary systems are often found by identifying two stars that are closer together than would be expected by chance. However, in regions with non-trivial density distributions, the ‘random’ distances between stars varies because of the background distribution, as well as the presence of binaries. We show that when no binaries are present, the distribution of the ratios of the distances to the nearest and tenth nearest neighbours,d1/d10, is always well approximated by a Gaussian with mean 0.2–0.3 and variance 0.16–0.19 for any underlying density distribution. The introduction of binaries causes some (or all) nearest neighbours to become closer than expected by random chance, introducing a component to the distribution whered1/d10is much lower than expected. We show how a simple single or double Gaussian fit to the distribution ofd1/d10can be used to find the binary fraction in any underlying density distribution quickly and simply.
DOI: 10.1006/icar.1999.6299
发表时间: 2000
期刊: Icarus
影响因子: 3.2
作者:
V. Mannings;A. Boss;S. Russell
通讯作者: V. Mannings;A. Boss;S. Russell
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期刊: Philosophical Transactions of the Royal Society of London
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发表时间: 2009
期刊: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
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