{
  "id": "1410.5732",
  "version": "v1",
  "published": "2014-10-21T16:30:38.000Z",
  "updated": "2014-10-21T16:30:38.000Z",
  "title": "Radial velocity measurements of the pulsating zirconium star: LS IV -14 116",
  "authors": [
    "C. Simon Jeffery",
    "Amir Ahmad",
    "Naslim Neelamkodan",
    "Wolfgang Kerzendorf"
  ],
  "comment": "To appear in MNRAS: Accepted 2014 October 20, 6 pages, 2 table, 8 figures",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "The helium-rich hot subdwarf LS IV -14 116 shows remarkably high surface abundances of zirconium, yttrium, strontium, and germanium, indicative of strong chemical stratification in the photosphere. It also shows photometric behaviour indicative of non-radial g-mode pulsations, despite having surface properties inconsistent with any known pulsational instability zone. We have conducted a search for radial velocity variability. This has demonstrated that at least one photometric period is observable in several absorption lines as a radial velocity variation with a semi-amplitude in excess of 5 km s$^{-1}$. A correlation between line strength and pulsation amplitude provides evidence that the photosphere pulsates differentially. The ratio of light to velocity amplitude is too small to permit the largest amplitude oscillation to be radial.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-10-21T16:30:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "radial velocity measurements",
      "pulsating zirconium star",
      "helium-rich hot subdwarf ls",
      "radial velocity variation",
      "largest amplitude oscillation"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stu2203",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Jan",
      "volume": 446,
      "number": 2,
      "pages": 1889
    },
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2015MNRAS.446.1889J"
    }
  }
}