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A survey of the weakest-field magnetic Ap stars: discovery of a threshold magnetic field strength?

Published online by Cambridge University Press:  02 March 2005

M. Aurière ,
J. Silvester ,
G.A. Wade ,
S. Bagnulo ,
J.-F. Donati ,
N. Johnson ,
F. Lignières ,
J.D. Landstreet ,
T. Lüftinger  and
D. Mouillet
...Show all authors
M. Aurière
Affiliation:
Observatoire Midi Pyrénées, France
J. Silvester
Affiliation:
Department of Physics, Royal Military College of Canada
G.A. Wade
Affiliation:
Department of Physics, Royal Military College of Canada
S. Bagnulo
Affiliation:
European Southern Observatory, Chile
J.-F. Donati
Affiliation:
Observatoire Midi Pyrénées, France
N. Johnson
Affiliation:
Department of Physics, Royal Military College of Canada
F. Lignières
Affiliation:
Observatoire Midi Pyrénées, France
J.D. Landstreet
Affiliation:
University of Western Ontario, Canada
T. Lüftinger
Affiliation:
Universitat Wien Institut für Astronomie, Austria
D. Mouillet
Affiliation:
Observatoire Midi Pyrénées, France
F. Paletou
Affiliation:
Observatoire Midi Pyrénées, France
P. Petit
Affiliation:
Max Planck Institut für Astrophysik, Germany
S. Strasser
Affiliation:
University of Calgary, Canada
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Abstract

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We are conducting a magnetic survey of a sample of about 30 spectroscopically identified Ap stars, with weak or previously undetected magnetic fields. For 28 studied stars, we have obtained 25 detections of Stokes V Zeeman signatures. Our results suggest that all Ap stars are magnetic. Further there may exist a minimum field strength for which Ap-type characteristics are produced.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Keywords

Methods: data analysistechniques: polarimetricstars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS224 , July 2004 , pp. 633 - 636
Copyright
© 2004 International Astronomical Union