{
  "id": "1604.04635",
  "version": "v1",
  "published": "2016-04-15T20:34:23.000Z",
  "updated": "2016-04-15T20:34:23.000Z",
  "title": "EG Andromedae: A New Orbit and Additional Evidence for a Photoionized Wind",
  "authors": [
    "Scott J. Kenyon",
    "Michael R. Garcia"
  ],
  "comment": "16 pages of text, 2 tables. 6 figure, Astronomical Journal, accepted",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We analyze a roughly 20 yr set of spectroscopic observations for the symbiotic binary EG And. Radial velocities derived from echelle spectra are best-fit with a circular orbit having orbital period P = 483.3 +- 1.6 days and semi-amplitude K = 7.34 +- 0.07 km/sec. Combined with previous data, these observations rule out an elliptical orbit at the 10-sigma level. Equivalent widths of H~I Balmer emission lines and various absorption features vary in phase with the orbital period. Relative to the radius of the red giant primary, the apparent size of the H II region is consistent with a model where a hot secondary star with effective temperature of roughly 75,000 K ionizes the wind from the red giant.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2016-04-15T20:34:23.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "additional evidence",
      "photoionized wind",
      "orbital period",
      "andromedae",
      "balmer emission lines"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}