{
  "id": "1607.04385",
  "version": "v1",
  "published": "2016-07-15T06:11:06.000Z",
  "updated": "2016-07-15T06:11:06.000Z",
  "title": "Sulfur and zinc abundances of red giant stars",
  "authors": [
    "Yoichi Takeda",
    "Masashi Omiya",
    "Hiroki Harakawa",
    "Bun'ei Sato"
  ],
  "comment": "20 pages, 8 figures, 3 tables (along with 2 electronic data tables), accepted for publication in Publ. Astron. Soc. Japan",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "Sulfur and zinc are chemically volatile elements, which play significant roles as depletion-free tracers in studying galactic chemical evolution. However, regarding red giants having evolved off the main sequence, reliable abundance determinations of S and Zn seem to be difficult despite that a few studies have been reported so far. Given this situation, we tried to establish the abundances of these elements for an extensive sample of 239 field GK giants (-0.8 < [Fe/H] < +0.2), by applying the spectrum-fitting technique to S I 8694-5, S I 6757, and Zn I 6362 lines and by taking into account the non-LTE effect. Besides, similar abundance analysis was done for 160 FGK dwarfs to be used for comparison. The non-LTE corrections for the S and Zn abundances derived from these lines turned out < 0.1(-0.2) dex for most cases and not very significant. It revealed that the S I 6757 feature is more reliable as an abundance indicator than S I 8694-5 for the case of red giants, because the latter suffers blending of unidentified lines. The finally resulting [S/Fe]-[Fe/H] and [Zn/Fe]-[Fe/H] relations for GK giants were confirmed to be in good agreement with those for FGK dwarfs, indicating that S and Zn abundances of red giants are reliably determinable from the S I 6757 and Zn I 6362 lines. Accordingly, not only main-sequence stars but also evolved red giant stars are usable for tracing the chemical evolution history of S and Zn in the regime of disk metallicity by using these lines.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-07-15T06:11:06.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "red giant stars",
      "zinc abundances",
      "fgk dwarfs",
      "zn abundances",
      "similar abundance analysis"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 20,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}