{
  "id": "1411.7608",
  "version": "v1",
  "published": "2014-11-27T14:12:44.000Z",
  "updated": "2014-11-27T14:12:44.000Z",
  "title": "The Chemical Compositions and Evolutionary Status of Red Giants in the Open Cluster NGC 752",
  "authors": [
    "G. Böcek Topcu",
    "M. Afşar",
    "M. Schaeuble",
    "C. Sneden"
  ],
  "comment": "Accepted for publication in MNRAS (19 pages, 15 figures)",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We present detailed chemical compositions of 10 red giant star members of the Galactic (open) cluster NGC 752, derived from high-resolution (R $\\approx$ 60,000), high signal-to-noise ($S/N$ $\\geq$ 140) spectra. We confirmed cluster memberships by measuring the stellar radial velocities, and by deriving model atmosphere parameters ($T_{eff}$, logg, [Fe/H] and $\\xi_{t}$) from equivalent widths of Fe I, Fe II, Ti I, and Ti II lines. The metallicity we obtained for NGC 752 ([Fe/H]=$-$0.02$\\pm$0.05) is in good agreement with previous studies. We derived abundances of $\\alpha$ (Mg, Si, Ca), light odd-Z (Na, Al), Fe-group (Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn), $n$-capture (Y, La, Nd, Eu), and $p$-capture (Li, C, N, O) species for each star. Furthermore, we also derived abundances of the LiCNO $p$-capture element group and carbon isotopic ratios, using synthetic spectrum analyses of the Li I 6707~\\AA\\ resonance doublet, the [O I] line at 6300~\\AA, the CH G-band features near 4311 and 4325 \\AA, the C$_{2}$ bandheads at 5160 and 5631 \\AA, and $^{12,13}$CN red system lines in the 7995$-$8040~\\AA\\ region. By applying recent isochrones to NGC~752 photometry, and comparing the color-magnitude diagram information to our Li abundances and \\ciso\\ ratios, we suggest that the 10 observed red giants can be separated into three first-ascent, six red-clump and one red horizontal branch star.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-11-27T14:12:44.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "open cluster ngc",
      "red giant",
      "chemical compositions",
      "evolutionary status",
      "red horizontal branch star"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stu2380",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Feb",
      "volume": 446,
      "number": 4,
      "pages": 3562
    },
    "note": {
      "typesetting": "TeX",
      "pages": 19,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015MNRAS.446.3562B"
    }
  }
}