{
  "id": "1009.5673",
  "version": "v1",
  "published": "2010-09-28T20:00:02.000Z",
  "updated": "2010-09-28T20:00:02.000Z",
  "title": "An R- and I-Band Photometric Variability Survey of the Cygnus OB2 Association",
  "authors": [
    "Calen B Henderson",
    "Kris Z Stanek",
    "Ondrej Pejcha",
    "Jose L Prieto"
  ],
  "comment": "34 pages, 12 figures, submitted to ApJ",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We present a catalog of photometrically variable stars discovered within two 21'.3 X 21'.3 fields centered on the Cygnus OB2 association. There have hitherto been no deep optical variability studies of Cyg OB2 despite it being replete with early-type massive stars, perhaps due to the high and variable extinction (up to A_V ~ 20) that permeates much of the region. Here we provide results of the first variability study with this combination of spatial coverage (~ 0.5 deg) and photometric depth (R ~ 21 mag). We find 121 stars to be variable in both R- and I-band, 116 of them newly discovered. Of the 121 variables, we identify 27 eclipsing binaries (EBs) and eclipsing binary candidates, 20 potential Herbig Ae/Be stars, and 52 pulsating variables. Confirming both the status and the cluster membership of the Herbig Ae/Be stars would address the uncertainty regarding the age and star formation history of Cyg OB2. We match our catalog to known variables and binaries in the region, 2MASS near-IR (NIR) data, and Chandra X-ray observations to find counterparts to new variables in other wavelengths.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-09-28T20:00:02.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "i-band photometric variability survey",
      "cygnus ob2 association",
      "potential herbig ae/be stars",
      "variability study",
      "cyg ob2 despite"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0067-0049/194/2/27",
      "journal": "The Astrophysical Journal Supplement Series",
      "year": 2011,
      "month": "Jun",
      "volume": 194,
      "number": 2,
      "pages": 27
    },
    "note": {
      "typesetting": "TeX",
      "pages": 34,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 871456,
      "adsabs": "2011ApJS..194...27H"
    }
  }
}