{
  "id": "1203.1266",
  "version": "v1",
  "published": "2012-03-06T18:04:39.000Z",
  "updated": "2012-03-06T18:04:39.000Z",
  "title": "A photometric and spectroscopic study of NSVS 14256825: the second sdOB+dM eclipsing binary",
  "authors": [
    "L. A. Almeida",
    "F. Jablonski",
    "J. Tello",
    "C. V. Rodrigues"
  ],
  "comment": "8 pages, 7 figures, accepted for publication in MNRAS",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We present an analysis of UBVR$_{\\rm C}$I$_{\\rm C}$JH photometry and phase-resolved optical spectroscopy of NSVS 14256825, an HW Vir type binary. The members of this class consist of a hot subdwarf and a main-sequence low-mass star in a close orbit ($P_{\\rm orb} ~ 0.1$ d). Using the primary-eclipse timings, we refine the ephemeris for the system, which has an orbital period of 0.11037 d. From the spectroscopic data analysis, we derive the effective temperature, $T_1 = 40000 \\pm 500$ K, the surface gravity, $\\log g_1 = 5.50\\pm0.05$, and the helium abundance, $n(\\rm He)/n(\\rm H)=0.003\\pm0.001$, for the hot component. Simultaneously modelling the photometric and spectroscopic data using the Wilson-Devinney code, we obtain the geometrical and physical parameters of NSVS 14256825. Using the fitted orbital inclination and mass ratio ($i = 82\\fdg5\\pm0\\fdg3$ and $q = M_2/M_1 = 0.260\\pm0.012$, respectively), the components of the system have $M_1 = 0.419 \\pm 0.070 M_{\\odot}$, $R_1 = 0.188 \\pm 0.010 R_{\\odot}$, $M_2 = 0.109 \\pm 0.023 M_{\\odot}$, and $R_2 = 0.162 \\pm 0.008 R_{\\odot}$. From its spectral characteristics, the hot star is classified as an sdOB star.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2012-03-06T18:04:39.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spectroscopic study",
      "eclipsing binary",
      "photometric",
      "hw vir type binary",
      "spectroscopic data analysis"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1111/j.1365-2966.2012.20891.x",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2012,
      "month": "Jun",
      "volume": 423,
      "number": 1,
      "pages": 478
    },
    "note": {
      "typesetting": "TeX",
      "pages": 8,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1093022,
      "adsabs": "2012MNRAS.423..478A"
    }
  }
}