Stellar Loci II. A Model-free Estimate of the Binary Fraction for Field FGK Stars

  title={Stellar Loci II. A Model-free Estimate of the Binary Fraction for Field FGK Stars},
  author={Haibo Yuan and Xiaowei Liu and Maosheng Xiang and Yang Huang and Bingqiu Chen},
  journal={The Astrophysical Journal},
We propose a stellar locus outlier (SLOT) method to determine the binary fraction of main-sequence stars statistically. The method is sensitive to neither the period nor mass ratio distributions of binaries and is able to provide model-free estimates of binary fraction for large numbers of stars of different populations in large survey volumes. We have applied the SLOT method to two samples of stars from the Sloan Digital Sky Survey (SDSS) Stripe?82, constructed by combining the recalibrated… 
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