{
  "id": "1407.2329",
  "version": "v1",
  "published": "2014-07-09T01:10:09.000Z",
  "updated": "2014-07-09T01:10:09.000Z",
  "title": "The Physical Parameters of the Retired A Star HD185351",
  "authors": [
    "John Asher Johnson",
    "Daniel Huber",
    "Tabetha Boyajian",
    "John M. Brewer",
    "Timothy R. White",
    "Kaspar von Braun",
    "Vicente Maestro",
    "Dennis Stello",
    "Thomas Barclay"
  ],
  "comment": "ApJ accepted",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We report here an analysis of the physical stellar parameters of the giant star HD185351 using Kepler short-cadence photometry, optical and near infrared interferometry from CHARA, and high-resolution spectroscopy. Asteroseismic oscillations detected in the Kepler short-cadence photometry combined with an effective temperature calculated from the interferometric angular diameter and bolometric flux yield a mean density, rho_star = 0.0130 +- 0.0003 rho_sun and surface gravity, logg = 3.280 +- 0.011. Combining the gravity and density we find Rstar = 5.35 +- 0.20 Rsun and Mstar = 1.99 +- 0.23 Msun. The trigonometric parallax and CHARA angular diameter give a radius Rstar = 4.97 +- 0.07 Rsun. This smaller radius,when combined with the mean stellar density, corresponds to a stellar mass Mstar = 1.60 +- 0.08 Msun, which is smaller than the asteroseismic mass by 1.6-sigma. We find that a larger mass is supported by the observation of mixed modes in our high-precision photometry, the spacing of which is consistent only for Mstar =~ 1.8 Msun. Our various and independent mass measurements can be compared to the mass measured from interpolating the spectroscopic parameters onto stellar evolution models, which yields a model-based mass M_star = 1.87 +- 0.07 Msun. This mass agrees well with the asteroseismic value,but is 2.6-sigma higher than the mass from the combination of asteroseismology and interferometry. The discrepancy motivates future studies with a larger sample of giant stars. However, all of our mass measurements are consistent with HD185351 having a mass in excess of 1.5 Msun.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-07-09T01:10:09.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "physical parameters",
      "kepler short-cadence photometry",
      "giant star hd185351",
      "stellar mass mstar",
      "stellar evolution models"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1088/0004-637X/794/1/15",
      "journal": "The Astrophysical Journal",
      "year": 2014,
      "month": "Oct",
      "volume": 794,
      "number": 1,
      "pages": 15
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014ApJ...794...15J"
    }
  }
}