Is the Wind of the Galactic Oe Star HD 155806 Magnetically Confined?
A. W. Fullerton, V. Petit, S. Bagnulo, G. A. Wade, and the MiMeS, Collaboration
TL;DR
This study used spectropolarimetric data to investigate whether magnetic fields confine the stellar wind of HD 155806, finding no evidence of a magnetic origin for its disk.
Contribution
The paper provides the first high-precision spectropolarimetric test of magnetic confinement in HD 155806, challenging previous magnetic detection claims.
Findings
No dipole magnetic field detected
Magnetism unlikely responsible for the star's disk
Previous magnetic detection reports not confirmed
Abstract
Spectropolarimetric observations of HD 155806 - the hottest Galactic Oe star - were obtained with CFHT/ESPaDOnS to test the hypothesis that disk signatures in its spectrum are due to magnetic channeling and confinement of its stellar wind. We did not detect a dipole field of sufficient strength to confine the wind, and could not confirm previous reports of a magnetic detection. It appears that stellar magnetism is not responsible for producing the disk of HD 155806.
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