{
  "id": "1710.02524",
  "version": "v1",
  "published": "2017-10-06T18:00:00.000Z",
  "updated": "2017-10-06T18:00:00.000Z",
  "title": "Absolute dimensions of the F-type eclipsing binary V2154 Cygni",
  "authors": [
    "Jane C. Bright",
    "Guillermo Torres"
  ],
  "comment": "9 pages in emulateapj format, including figures and tables. Accepted for publication in The Astrophysical Journal",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We report spectroscopic observations of the 2.63 day, detached, F-type main-sequence eclipsing binary V2154 Cyg. We use our observations together with existing $uvby$ photometric measurements to derive accurate absolute masses and radii for the stars good to better than 1.5%. We obtain masses of M1 = 1.269 +/- 0.017 M(Sun) and M2 = 0.7542 +/- 0.0059 M(Sun), radii of R1 = 1.477 +/- 0.012 R(Sun) and R2 = 0.7232 +/- 0.0091 R(Sun), and effective temperatures of 6770 +/- 150 K and 5020 +/- 150 K for the primary and secondary stars, respectively. Both components appear to have their rotations synchronized with the motion in the circular orbit. A comparison of the properties of the primary with current stellar evolution models gives good agreement for a metallicity of [Fe/H] = -0.17, which is consistent with photometric estimates, and an age of about 2.2 Gyr. On the other hand, the K2 secondary is larger than predicted for its mass by about 4%. Similar discrepancies are known to exist for other cool stars, and are generally ascribed to stellar activity. The system is in fact an X-ray source, and we argue that the main site of the activity is the secondary star. Indirect estimates give a strength of about 1 kG for the surface magnetic field on that star. A previously known close visual companion to V2154 Cyg is shown to be physically bound, making the system a hierarchical triple.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2017-10-06T18:00:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "f-type eclipsing binary v2154 cygni",
      "absolute dimensions",
      "main-sequence eclipsing binary v2154 cyg",
      "secondary star"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}