{
  "id": "1302.1899",
  "version": "v1",
  "published": "2013-02-07T22:39:09.000Z",
  "updated": "2013-02-07T22:39:09.000Z",
  "title": "Variability of Hypervelocity Stars",
  "authors": [
    "Idan Ginsburg",
    "Warren R. Brown",
    "Gary A. Wegner"
  ],
  "comment": "7 pages, 12 figures, 2 tables, submitted to ApJ",
  "categories": [
    "astro-ph.GA"
  ],
  "abstract": "We present time-series photometry of 11 hypervelocity stars (HVSs) to constrain their nature. Known HVSs are mostly late-B spectral type objects that may be either main-sequence (MS) or evolved blue horizontal branch (BHB) stars. Fortunately, MS stars at these effective temperatures, $T_{eff} \\sim$ 12,000 K, are good candidates for being a class of variable stars known as slowly pulsating B stars (SPBs). We obtained photometry on four nights at the WIYN 3.5 m telescope, and on six nights on the 2.4 m Hiltner telescope. Using sinusoidal fits, we constrain four of our targets to have periods between $P \\sim 0.2 - 2$ days, with a mean value of 0.6 days. Our amplitudes vary between $A = 0.5 - 3$%. This suggests that these four HVSs are SPBs. We discuss a possible origin for these stars, and why further observations are necessary.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-02-07T22:39:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hypervelocity stars",
      "variability",
      "late-b spectral type objects",
      "evolved blue horizontal branch",
      "amplitudes vary"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1218122,
      "adsabs": "2013arXiv1302.1899G"
    }
  }
}