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Cartography of the magnetic fields and chemical spots of Ap stars

Published online by Cambridge University Press:  01 November 2008

James Silvester
Affiliation:
Department of Physics, Royal Military College of Canada, Kingston, ON, Canada, K7K 4B4 Department of Physics, Queen's University, Kingston, Ontario, Canada
O. Kochukhov
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 515, 751 20 Uppsala, Sweden
G. A. Wade
Affiliation:
Department of Physics, Royal Military College of Canada, Kingston, ON, Canada, K7K 4B4
N. Piskunov
Affiliation:
Department of Physics and Astronomy, Uppsala University, Box 515, 751 20 Uppsala, Sweden
J. D. Landstreet
Affiliation:
Dept. of Physics & Astronomy, Univ. of Western Ontario, London, ON, Canada, N6A 3K7
S. Bagnulo
Affiliation:
Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland
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Abstract

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We will introduce a project using Magnetic Doppler Imaging (MDI) to create assumption-free vector magnetic field maps and chemical surface structure maps of chemically peculiar A and B type (or Ap) stars. We are exploiting the latest generation of spectropolarimeters (NARVAL at the Pic du Midi observatory, and ESPaDOnS at the Canada-France-Hawaii telescope), to obtain high-resolution time series of Stokes IQUV spectra of a selection of Ap stars. The spectra have superior signal-to-noise ratio, resolution and wavelength coverage to those used previously. This combined with the ground-breaking inversion techniques introduced by Kochukhov et al. (2002) results in maps which represent the state-of-the-art in the field of stellar cartography. These maps will allow us to better understand the links between the magnetic field and the physical processes leading to the formation of chemical structures in the photosphere and allow us to address questions surrounding the detailed magnetic field geometry of Ap stars.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

References

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