The magnetic field of $ζ$ Ori A

• Main Authors: Blazère, A., Neiner, C., Bouret, J-C., Tkachenko, A., collaboration, the MiMeS
• Format: Text
• Language: unknown
• Published: arXiv 2014
• Subjects: Solar and Stellar Astrophysics astro-ph.SR; FOS Physical sciences; narval
• Online Access: https://dx.doi.org/10.48550/arxiv.1408.0178; https://arxiv.org/abs/1408.0178

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 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. : proceedings of IAUS 307