Observations and Models of Centrifugally Supported Magnetospheres in Massive
Stars
Magnetic massive stars, via their strong magnetic fields and
radiation-driven winds, strongly influence the dynamical and chemical
evolution of their surroundings. The interaction between these two
intrinsic stellar properties can produce dynamic circumstellar structures,
and, in the case of rapidly rotating stars, centrifugally supported
magnetospheres. We use new observations to confront current magnetosphere
models, testing their predictive power using spectropolarimetry of the
prototypical magnetic B2Vp star sigma Ori E. In addition, we present the
discovery of a magnetic field in the rapidly rotating massive star HR 7355.
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