{
  "id": "1008.3086",
  "version": "v1",
  "published": "2010-08-18T13:19:05.000Z",
  "updated": "2010-08-18T13:19:05.000Z",
  "title": "No detection of large-scale magnetic fields at the surfaces of Am and HgMn stars",
  "authors": [
    "M. Auriere",
    "G. A. Wade",
    "F. Lignieres",
    "A. Hui-Bon-Hoa",
    "J. D. Landstreet",
    "I. Iliev",
    "J. -F. Donati",
    "P. Petit",
    "T. Roudier",
    "S. Theado"
  ],
  "comment": "6 pages, 3 figures, accepted for publication in A&A",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "We investigate the magnetic dichotomy between Ap/Bp and other A-type stars by carrying out a deep spectropolarimetric study of Am and HgMn stars. Using the NARVAL spectropolarimeter at the Telescope Bernard Lyot (Observatoire du Pic du Midi, France), we obtained high-resolution circular polarisation spectroscopy of 12 Am stars and 3 HgMn stars. Using Least Squares Deconvolution (LSD), no magnetic field is detected in any of the 15 observed stars. Uncertaintiies as low as 0.3 G (respectively 1 G) have been reached for surface-averaged longitudinal magnetic field measurements for Am (respectively HgMn) stars. Associated with the results obtained previously for Ap/Bp stars, our study confirms the existence of a magnetic dichotomy among A-type stars. Our data demonstrate that there is at least one order of magnitude difference in field strength between Zeeman detected stars (Ap/Bp stars) and non Zeeman detected stars (Am and HgMn stars). This result confirms that the spectroscopically-defined Ap/Bp stars are the only A-type stars harbouring detectable large-scale surface magnetic fields.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2010-08-18T13:19:05.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "hgmn stars",
      "large-scale magnetic fields",
      "large-scale surface magnetic fields",
      "longitudinal magnetic field measurements",
      "detectable large-scale surface magnetic"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1051/0004-6361/201014848",
      "journal": "Astronomy and Astrophysics",
      "year": 2010,
      "month": "Nov",
      "volume": 523
    },
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 865589,
      "adsabs": "2010A&A...523A..40A"
    }
  }
}