{
  "id": "0811.2533",
  "version": "v1",
  "published": "2008-11-15T22:29:27.000Z",
  "updated": "2008-11-15T22:29:27.000Z",
  "title": "The Cepheid Period-Luminosity Relation at Mid-Infrared Wavelengths: II. Second-Epoch LMC Data",
  "authors": [
    "Barry F. Madore",
    "Wendy L. Freedman",
    "Jane Rigby",
    "S. E. Persson",
    "Laura Sturch",
    "Violet Major"
  ],
  "comment": "7 pages, 6 figures, 1 data table",
  "journal": "Astrophys.J.695:988-995,2009",
  "doi": "10.1088/0004-637X/695/2/988",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We present revised and improved mid-infrared Period-Luminosity (PL) relations for Large Magellanic Cloud (LMC) Cepheids based on double-epoch data of 70 Cepheids observed by Spitzer at 3.6, 4.5, 5.8 and 8.0um. The observed scatter at all wavelengths is found to decrease from +/-0.17 mag to +/-0.14 mag, which is fully consistent with the prediction that the total scatter is made up of roughly equal contributions from random sampling of the light curve and nearly-uniform samplings of stars across the instability strip. It is calculated that the Cepheids in this sample have a full amplitude of about 0.4 mag and that their fully-sampled, time-averaged magnitudes should eventually reveal mid-infrared PL relations that each have intrinsic scatter at most at the +/-0.12 mag level, and as low as +/-0.08 mag after correcting for the tilt of the LMC.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2008-11-15T22:29:27.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cepheid period-luminosity relation",
      "second-epoch lmc data",
      "mid-infrared wavelengths",
      "large magellanic cloud",
      "eventually reveal mid-infrared pl relations"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "The Astrophysical Journal",
      "year": 2009,
      "month": "Apr",
      "volume": 695,
      "number": 2,
      "pages": 988
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 802696,
      "adsabs": "2009ApJ...695..988M"
    }
  }
}