{
  "id": "1310.5265",
  "version": "v1",
  "published": "2013-10-19T19:39:43.000Z",
  "updated": "2013-10-19T19:39:43.000Z",
  "title": "Stokes IQUV mapping of $α^2$ CVn & other Ap stars using ESPaDOnS and NARVAL",
  "authors": [
    "J. Silvester",
    "O. Kochukhov",
    "G. A. Wade"
  ],
  "comment": "6 pages, 3 figures. Proceedings of New advances in stellar physics: from microscopic to macroscopic processes (Roscoff 2013)",
  "categories": [
    "astro-ph.SR"
  ],
  "abstract": "New spectral line polarisation observations of 7 bright Ap stars have been obtained with the ESPaDOnS and Narval high resolution spectropolarimeters (Silvester et al. 2012). The aim of this data set is produce a series of surface magnetic field and surface chemistry maps for these Ap stars. We present new magnetic maps for the Ap star $\\alpha^2$ CVn using these new data and the MDI inversion code INVERS10. $\\alpha^2$ CVn is the first Ap star to be observed during two separate epochs using high resolution phase resolved spectropolarimetric $IQUV$ observations and as such allows us an insight into how stable the surface magnetic structure is over a decade timescale. We show that the new maps give a magnetic field structure consistent with the previous maps obtained by Kochukhov and Wade (2010) from lower quality MuSiCoS spectra taken a decade ago and that the field topology cannot be described by a dipolar or quadrupolar field.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2013-10-19T19:39:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "ap star",
      "stokes iquv mapping",
      "lower quality musicos spectra taken",
      "high resolution phase resolved spectropolarimetric",
      "magnetic field structure consistent"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2013EAS....63...79S"
    }
  }
}