{
  "id": "2108.11120",
  "version": "v1",
  "published": "2021-08-25T08:38:21.000Z",
  "updated": "2021-08-25T08:38:21.000Z",
  "title": "Binary fraction of O and B-type stars from LAMOST data",
  "authors": [
    "Feng Luo",
    "Yong-Heng Zhao",
    "Jiao Li",
    "Yan-Jun Guo",
    "Chao Liu"
  ],
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Binary stars plays important role in the evolution of stellar populations . The intrinsic binary fraction ($f_{bin}$) of O and B-type (OB) stars in LAMOST DR5 was investigated in this work. We employed a cross-correlation approach to estimate relative radial velocities for each of the stellar spectra. The algorithm described by \\cite{2013A&A...550A.107S} was implemented and several simulations were made to assess the performance of the approach. Binary fraction of the OB stars are estimated through comparing the uni-distribution between observations and simulations with the Kolmogorov-Smirnov tests. Simulations show that it is reliable for stars most of whom have $6,7$ and $8$ repeated observations. The uncertainty of orbital parameters of binarity become larger when observational frequencies decrease. By adopting the fixed power exponents of $\\pi=-0.45$ and $\\kappa=-1$ for period and mass ratio distributions, respectively, we obtain that $f_{bin}=0.4_{-0.06}^{+0.05}$ for the samples with more than 3 observations. When we consider the full samples with at least 2 observations, the binary fraction turns out to be $0.37_{-0.03}^{+0.03}$. These two results are consistent with each other in $1\\sigma$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-08-25T08:38:21.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "b-type stars",
      "lamost data",
      "binary stars plays important role",
      "observations",
      "intrinsic binary fraction"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}