{
  "id": "1004.0435",
  "version": "v1",
  "published": "2010-04-03T10:34:54.000Z",
  "updated": "2010-04-03T10:34:54.000Z",
  "title": "Doppler tomography of the black hole binary A0620-00 and the origin of chromospheric emission in quiescent X-ray binaries",
  "authors": [
    "J. I. Gonzalez Hernandez",
    "J. Casares"
  ],
  "comment": "Accepted for publication in Astronomy & Astrophysics",
  "categories": [
    "astro-ph.GA",
    "astro-ph.SR"
  ],
  "abstract": "Doppler tomography of emission line profiles in low mass X-ray binaries allows us to disentangle the different emission sites and study the structure and variability of accretion disks. We present UVES high-resolution spectroscopic observations of the black hole binary A0620-00 at quiescence.These spectroscopic data constrain the orbital parameters Porb=0.32301405(1) d and K2=437.1+-2.0 km/s. These values, together with the mass ratio q=M2/M1=0.062+-0.010, imply a minimum mass for the compact object of M1(sin i)^3=3.15+-0.10 Msun, consistent with previous works.The H$\\alpha$ emission from the accretion disk is much weaker than in previous studies, possibly due to a decrease in disk activity. Doppler imaging of the H$\\alpha$ line shows for the first time a narrow component coming from the secondary star, with an observed equivalent width of 1.4+-0.3 Angstroms, perhaps associated to chromospheric activity. Subtracting a K-type template star and correcting for the veiling of the accretion disk yields to an equivalent width of 2.8+-0.3 Angstroms. A bright hot-spot is also detected at the position where the gas stream trajectory intercepts with the accretion disk. The H$\\alpha$ flux associated to the secondary star is too large to be powered by X-ray irradiation. It is comparable to those observed in RS CVn binaries with similar orbital periods and, therefore, is probably triggered by the rapid stellar rotation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-04-03T10:34:54.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "black hole binary",
      "quiescent x-ray binaries",
      "doppler tomography",
      "accretion disk",
      "chromospheric emission"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201014088",
      "journal": "Astronomy and Astrophysics",
      "year": 2010,
      "month": "Jun",
      "volume": 516
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 850920,
      "adsabs": "2010A&A...516A..58G"
    }
  }
}