{
  "id": "1302.3517",
  "version": "v1",
  "published": "2013-02-14T19:26:46.000Z",
  "updated": "2013-02-14T19:26:46.000Z",
  "title": "The 10830 He I Absorption Line Among Metal-Poor Subdwarfs",
  "authors": [
    "Graeme H. Smith",
    "Andrea K. Dupree",
    "Jay Strader"
  ],
  "comment": "8 pages, published in PASP",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Spectra of the He I 10830 line have been obtained for 23 metal-poor stars, the majority of which are dwarfs ranging in metallicity from [Fe/H] = -2.1 to -0.8. The data were acquired with the NIRSPEC spectrograph on the Keck 2 telescope. Most of these subdwarfs and dwarfs are found to exhibit a He I absorption line indicative of the presence of chromospheres. The equivalent width of the 10830 absorption profile is generally less than 70 mA, and covers a range similar to that found in solar metallicity stars of low activity. Among the subdwarfs the He I equivalent width does not correlate with either [Fe/H] metallicity or (B-V) color. Some evidence for asymmetric profiles is found among metal-poor dwarfs, but not the high-speed blue-shifted absorption displayed by some metal-poor red giants.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-02-14T19:26:46.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "absorption line",
      "metal-poor subdwarfs",
      "equivalent width",
      "solar metallicity stars",
      "metal-poor red giants"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1086/668865",
      "journal": "Publications of the Astronomical Society of the Pacific",
      "year": 2012,
      "month": "Dec",
      "volume": 124,
      "number": 922,
      "pages": 1252
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1219303,
      "adsabs": "2012PASP..124.1252S"
    }
  }
}