{
  "id": "1708.01264",
  "version": "v1",
  "published": "2017-08-03T18:00:14.000Z",
  "updated": "2017-08-03T18:00:14.000Z",
  "title": "The Pristine survey III: Spectroscopic confirmation of an efficient search for extremely metal-poor stars",
  "authors": [
    "K. Youakim",
    "E. Starkenburg",
    "D. S. Aguado",
    "N. F. Martin",
    "M. Fouesneau",
    "J. I. González Hernández",
    "C. Allende Prieto",
    "P. Bonifacio",
    "M. Gentile",
    "C. Kielty",
    "P. Côté",
    "P. Jablonka",
    "A. McConnachie",
    "R. Sánchez Janssen",
    "E. Tolstoy",
    "K. Venn"
  ],
  "comment": "14 pages, 6 figures, 4 tables, full version of Table 1 available on-line only, accepted for publication in MNRAS",
  "doi": "10.1093/mnras/stx2005",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "The Pristine survey is a narrow-band, photometric survey focused around the wavelength region of the Ca II H & K absorption lines, designed to efficiently search for extremely metal-poor stars. In this work, we use the first results of a medium-resolution spectroscopic follow-up to refine the selection criteria for finding extremely metal-poor stars ($\\textrm{[Fe/H]} \\leq -3.0$) in the Pristine survey. We consider methods by which stars can be selected from available broad-band and infrared photometry plus the additional Pristine narrow-band photometry. The spectroscopic sample presented in this paper consists of 205 stars in the magnitude range $14 < V < 18$. Applying the photometric selection criteria cuts the sample down to 149 stars, and from these we report a success rate of 70% for finding stars with $\\textrm{[Fe/H]} \\leq -2.5$ and 22% for finding stars with $\\textrm{[Fe/H]} \\leq -3.0$. These statistics compare favourably with other surveys that search for extremely metal-poor stars, namely an improvement by a factor of $\\sim 4-5$ for recovering stars with $\\textrm{[Fe/H]} \\leq -3.0$. In addition, Pristine covers a fainter magnitude range than its predecessors, and can thus probe deeper into the Galactic halo.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-08-03T18:00:14.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "extremely metal-poor stars",
      "pristine survey",
      "efficient search",
      "spectroscopic confirmation",
      "photometric selection criteria cuts"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 14,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}