{
  "id": "1404.4390",
  "version": "v1",
  "published": "2014-04-16T21:31:45.000Z",
  "updated": "2014-04-16T21:31:45.000Z",
  "title": "The Light Curve Shapes as a Key to Resolving the Origin of Long Secondary Periods in Red Giant Stars",
  "authors": [
    "I. Soszynski",
    "A. Udalski"
  ],
  "comment": "7 pages, 7 figures, accepted for publication in ApJ",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We present a study of OGLE light curves of red giant stars exhibiting long secondary periods (LSPs) - an enigmatic phenomenon commonly observed in stars on the upper red giant branch and asymptotic giant branch. We show that the light curves of LSP stars are essentially identical to those of the spotted variables with one dark spot on their photospheres. Such a behavior can be explained by a presence of a dusty cloud orbiting the red giant together with a low-mass companion in a close, circular orbit. We argue that the binary scenario is in agreement with most of the observational properties of LSP variables, including non-sinusoidal shapes of their radial velocity curves.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-04-16T21:31:45.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "red giant stars",
      "light curve shapes",
      "giant stars exhibiting long",
      "exhibiting long secondary periods",
      "stars exhibiting long secondary"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/788/1/13",
      "journal": "The Astrophysical Journal",
      "year": 2014,
      "month": "Jun",
      "volume": 788,
      "number": 1,
      "pages": 13
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1291171,
      "adsabs": "2014ApJ...788...13S"
    }
  }
}