{
  "id": "1711.08183",
  "version": "v1",
  "published": "2017-11-22T09:12:51.000Z",
  "updated": "2017-11-22T09:12:51.000Z",
  "title": "12C/13C isotopic ratios in red-giant stars of the open cluster NGC 6791",
  "authors": [
    "László Szigeti",
    "Szabolcs Mészáros",
    "Verne V. Smith",
    "Katia Cunha",
    "Nadège Lagarde",
    "Corinne Charbonnel",
    "Matthew Shetrone",
    "Marc Pinsonneault",
    "Carlos Allende Prieto",
    "J. G. Fernández-Trincado",
    "József Kovács",
    "Sandro Villanova"
  ],
  "comment": "Accepted for publication in MNRAS, 9 pages, 4 figures, 2 tables",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Carbon isotope ratios, along with carbon and nitrogen abundances, are derived in a sample of 11 red-giant members of one of the most metal-rich clusters in the Milky Way, NGC 6791. The selected red-giants have a mean metallicity and standard deviation of [Fe/H]=+0.39+-0.06 (Cunha et al. 2015). We used high resolution H-band spectra obtained by the SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE). The advantage of using high-resolution spectra in the H-band is that lines of CO are well represented and their line profiles are sensitive to the variation of 12C/13C. Values of the 12C/13C ratio were obtained from a spectrum synthesis analysis. The derived 12C/13C ratios varied between 6.3 and 10.6 in NGC 6791, in agreement with the final isotopic ratios from thermohaline-induced mixing models. The ratios derived here are combined with those obtained for more metal poor red-giants from the literature to examine the correlation between 12C/13C, mass, metallicity and evolutionary status.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-11-22T09:12:51.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "open cluster ngc",
      "12c/13c isotopic ratios",
      "red-giant stars",
      "point observatory galactic evolution experiment",
      "apache point observatory galactic evolution"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}