{
  "id": "1008.4372",
  "version": "v1",
  "published": "2010-08-25T20:43:27.000Z",
  "updated": "2010-08-25T20:43:27.000Z",
  "title": "Detailed abundances of Red Giants in the Globular Cluster NGC~1851: C+N+O and the Origin of Multiple Populations",
  "authors": [
    "Sandro Villanova",
    "Douglas Geisler",
    "Giampaolo Piotto"
  ],
  "comment": "9 pages, 4 figures, accepted for publication on ApJ Letter",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present chemical abundance analysis of a sample of 15 red giant branch (RGB) stars of the Globular Cluster NGC~1851 distributed along the two RGBs of the (v, v-y) CMD. We determined abundances for C+N+O, Na, $\\alpha$, iron-peak, and s-elements. We found that the two RGB populations significantly differ in their light (N,O,Na) and s-element content. On the other hand, they do not show any significant difference in their $\\alpha$ and iron-peak element content. More importantly, the two RGB populations do not show any significant difference in their total C+N+O content. Our results do not support previous hypotheses suggesting that the origin of the two RGBs and the two subgiant branches of the cluster is related to a different content of either $\\alpha$ (including Ca) or iron-peak elements, or C+N+O abundance, due to a second generation polluted by SNeII.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-08-25T20:43:27.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "globular cluster",
      "red giant",
      "multiple populations",
      "detailed abundances",
      "significant difference"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/2041-8205/722/1/L18",
      "journal": "The Astrophysical Journal",
      "year": 2010,
      "month": "Oct",
      "volume": 722,
      "number": 1
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 866334,
      "adsabs": "2010ApJ...722L..18V"
    }
  }
}