The magnetic field of ζ Orionis A

  title={The magnetic field of $\zeta$ Orionis A},
  author={Aurore Blaz{\`e}re and Coralie Neiner and Andrew Tkachenko and J-C. Bouret and Th. Rivinius and The MiMeS Collaboration},
  journal={Astronomy and Astrophysics},
Zeta Ori A is a hot star claimed to host a weak magnetic field, but no clear magnetic detection was obtained so far. In addition, it was recently shown to be a binary system composed of a O9.5I supergiant and a B1IV star. We aim at verifying the presence of a magnetic field in zeta Ori A, identifying to which of the two binary components it belongs (or whether both stars are magnetic), and characterizing the field.Very high signal-to-noise spectropolarimetric data were obtained with Narval at… 
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