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The magnetic field of ζ Ori A

Published online by Cambridge University Press:  23 January 2015

A. Blazère
Affiliation:
LESIA, Observatoire de Paris, UMR 8109 du CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France email: aurore.blazere@obspm.fr
C. Neiner
Affiliation:
LESIA, Observatoire de Paris, UMR 8109 du CNRS, UPMC, Université Paris-Diderot, 5 place Jules Janssen, 92195 Meudon, France email: aurore.blazere@obspm.fr
J-C. Bouret
Affiliation:
Aix-Marseille University, CNRS, LAM, UMR 7326, 13388 Marseille, France
A. Tkachenko
Affiliation:
Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium
Corresponding
E-mail address:
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Abstract

Magnetic fields play a significant role in the evolution of massive stars. About 7% of massive stars are found to be magnetic at a level detectable with current instrumentation (Wade et al. 2013) and only a few magnetic O stars are known. Detecting magnetic field in O stars is particularly challenging because they only have few, often broad, lines to measure the field, which leads to a deficit in the knowledge of the basic magnetic properties of O stars. We present new spectropolarimetric Narval observations of ζ Ori A. We also provide a new analysis of both the new and older data taking binarity into account. The aim of this study was to confirm the presence of a magnetic field in ζ Ori A. We identify that it belongs to ζ Ori Aa and characterize it.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2015 

References

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