Is the wind of the Oe star HD 155806 magnetically confined?
V. Petit, A. W. Fullerton, S. Bagnulo, G. A. Wade (for the MiMeS, Collaboration)
TL;DR
This study investigates whether the magnetic field of the Oe star HD 155806 can confine its stellar wind, testing a hypothesis that magnetic fields produce the observed circumstellar disk structures.
Contribution
The paper presents spectropolarimetric observations of HD 155806 to test the magnetic confinement hypothesis for its circumstellar disk.
Findings
No magnetic field detected in HD 155806.
Results challenge the magnetic confinement model for this star.
Implications for understanding disk formation in Oe stars.
Abstract
Oe stars are a subset of the O-type stars that exhibit emission lines from a circumstellar disk. The recent detection of magnetic fields in some O-type stars suggests a possible explanation for the stability of disk-like structures around Oe stars. According to this hypothesis, the wind of the star is channeled by a dipolar magnetic field producing a disc in the magnetic equatorial plane. As a test of this model, we have obtained spectropolarimetric observations of the hottest Galactic Oe star HD 155806. Here we discuss the results and implications of those observations.
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