{
  "id": "astro-ph/0110553",
  "version": "v1",
  "published": "2001-10-25T15:02:16.000Z",
  "updated": "2001-10-25T15:02:16.000Z",
  "title": "X-Ray Observations of Cygnus X-2",
  "authors": [
    "S. Piraino",
    "A. Santangelo",
    "P. Kaaret"
  ],
  "comment": "22 pages, accepted to the Astrophysical Journal",
  "categories": [
    "astro-ph"
  ],
  "abstract": "We report on a joint BeppoSAX/RossiXTE observation of the Z-type low mass X-ray binary Cyg X-2. The source was in the so-called high overall intensity state and in less than 24 hours went through all three branches of the Z-track. The continuum x-ray spectrum could be described by the absorbed sum of a soft thermal component, modeled as either a blackbody or a multicolor disk blackbody, and a Comptonized component. The timing power spectrum showed several components including quasiperiodic oscillations in the range 28-50 Hz while the source was on the horizontal branch (horizontal branch oscillation; HBO). We found that the HBO frequency was well correlated with the parameters of the soft thermal component in the x-ray spectrum. We discuss implications of this correlation for models of the HBO.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2001-10-25T15:02:16.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "x-ray observations",
      "soft thermal component",
      "low mass x-ray binary cyg",
      "z-type low mass x-ray binary",
      "high overall intensity state"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 22,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 577572,
      "adsabs": "2001astro.ph.10553P"
    }
  }
}