{
  "id": "1308.6653",
  "version": "v1",
  "published": "2013-08-30T05:52:50.000Z",
  "updated": "2013-08-30T05:52:50.000Z",
  "title": "NGC 5694: another foster son of the Galactic Halo",
  "authors": [
    "A. Mucciarelli",
    "M. Bellazzini",
    "M. Catelan",
    "E. Dalessandro",
    "P. Amigo",
    "M. Correnti",
    "C. Cortés",
    "V. D'Orazi"
  ],
  "comment": "Accepted for publication by MNRAS. 15 pages, 8 figures, 4 tables",
  "categories": [
    "astro-ph.SR",
    "astro-ph.GA"
  ],
  "abstract": "We present the results of the analysis of high-resolution spectra obtained with UVES-FLAMES@VLT for six red giant branch stars in the outer-halo metal-poor ([Fe/H]I=-1.98 and [Fe/H]II=-1.83) Galactic globular cluster NGC 5694, which has been suggested as a possible incomer by Lee et al. (2006) based on the anomalous chemical composition of a single cluster giant. We obtain accurate abundances for a large number of elements and we find that: (a) the six target stars have the same chemical composition within the uncertainties, except for Na and Al; (b) the average cluster abundance of \\alpha\\ elements (with the only exception of Si) is nearly solar, at odds with typical halo stars and globular clusters of similar metallicity; (c) Y, Ba, La and Eu abundances are also significantly lower than in Galactic field stars and star clusters of similar metallicity. Hence we confirm the Lee et al. classification of NGC 5694 as a cluster of extra-galactic origin. We provide the first insight on the Na-O and Mg-Al anti-correlations in this cluster: all the considered stars have very similar abundance ratios for these elements, except one that has significantly lower [Na/Fe] and [Al/Fe] ratios, suggesting that some degree of early self-enrichment has occurred also in this cluster.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-08-30T05:52:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "galactic halo",
      "foster son",
      "galactic globular cluster ngc",
      "similar metallicity",
      "chemical composition"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stt1558",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2013,
      "month": "Nov",
      "volume": 435,
      "number": 4,
      "pages": 3667
    },
    "note": {
      "typesetting": "TeX",
      "pages": 15,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1251866,
      "adsabs": "2013MNRAS.435.3667M"
    }
  }
}