Non-parametric identification of single-lined binary candidates in young clusters using single-epoch spectroscopy,Astronomy & Astrophysics

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Non-parametric identification of single-lined binary candidates in young clusters using single-epoch spectroscopy
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-12-13 , DOI: 10.1051/0004-6361/202451694
Stefano Rinaldi, María Claudia Ramírez-Tannus

Aims. Binarity plays a crucial role in star formation and evolution. Consequently, identifying binary stars is essential to deepening our understanding of these processes. We propose a method to investigate the observed radial velocity distribution of massive stars in young clusters with the goal of identifying binary systems.Methods. We reconstruct the radial velocity distribution using a three-layer hierarchical Bayesian non-parametric approach; nonparametric methods are data-driven models able to infer arbitrary probability densities under minimal mathematical assumptions. When applying our statistical framework, it is possible to identify variable stars and binary systems because these deviate significantly from the expected intrinsic Gaussian distribution for radial velocities.Results. We tested our method with the massive star-forming region within the giant H_{II_{region M17. We are able to confidently identify binaries and variable stars with as little as single-epoch observations. The distinction between variable and binary stars improves significantly when introducing additional epochs.}}

中文翻译：

使用单纪元光谱对年轻簇中的单线候选二进制进行非参数鉴定

目标。双星性在恒星的形成和演化中起着至关重要的作用。因此，识别双星对于加深我们对这些过程的理解至关重要。我们提出了一种方法来研究在年轻星团中观测到的大质量恒星的径向速度分布，目的是识别双星系统。方法。我们使用三层分层贝叶斯非参数方法重建径向速度分布;非参数方法是数据驱动的模型，能够在最小的数学假设下推断任意概率密度。当应用我们的统计框架时，可以识别变星和双星系统，因为它们与视向速度的预期固有高斯分布明显不同。结果。我们在巨大的 HII 区域 M17 内的大质量恒星形成区域测试了我们的方法。我们能够自信地识别双星和变星，只需一个纪元的观测。引入额外的 epoch 时，变星和双星之间的区别会显著改善。