Discovery of a Centrifugal Magnetosphere Around the He-Strong Magnetic B1 Star ALS 3694
Matt Shultz, Gregg Wade, Thomas Rivinius, James Sikora, the MiMeS, Collaboration

TL;DR
This study reports the detection of a centrifugal magnetosphere around the He-strong magnetic B1 star ALS 3694, based on spectropolarimetric observations revealing a stable strong magnetic field and variable H-alpha emission.
Contribution
First detection of a centrifugal magnetosphere around a He-strong magnetic B1 star using spectropolarimetric data.
Findings
Stable approximately 2 kG magnetic field over 6 nights
Variable H-alpha emission peaking at high velocities
Presence of a centrifugal magnetosphere inferred from emission profiles
Abstract
We report the results of 6 nights of Canada-France-Hawaii Telescope spectropolarimetric ESPaDOnS observations of the He-strong, magnetic B1 type star ALS 3694. The longitudinal magnetic field is approximately 2 kG in all 6 observations, showing essentially no variation between nights. The H line displays variable emission on all nights, peaking at high velocities (). Given the presence of a strong (6 kG) magnetic field, and the similarity of the emission profile to that of other magnetic B-type stars, we interpret the emission as a consequence of a centrifugal magnetosphere.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astrophysics and Star Formation Studies · Solar and Space Plasma Dynamics
