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We report on the detection of a strong, organized magnetic field in thehelium-variable early B-type star HR 7355 using spectropolarimetric dataobtained with ESPaDOnS on CFHT by the MiMeS large program. We also presentresults from new V-band differential photometry obtained with the CTIO 0.9mtelescope. We investigate the longitudinal field, using a technique calledLeast-Squares Deconvolution (LSD), and the rotational period of HR 7355. Thesenew observations strongly support the proposal that HR 7355 harbors astructured magnetosphere similar to that in the prototypical helium-strongstar, sigma Ori E.

Discovery of a strong magnetic field in the rapidly rotating B2Vn star HR 7355