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We will review our recent analysis of the magnetic properties of the O9IVstar HD 57682, using spectropolarimetric observations obtained with ESPaDOnS atthe Canada-France-Hawaii telescope within the context of the Magnetism inMassive Stars (MiMeS) Large Program. We discuss our most recent determinationof the rotational period from longitudinal magnetic field measurements andH_alpha variability - the latter obtained from over a decade's worth ofprofessional and amateur spectroscopic observations. Lastly, we report on ourinvestigation of the magnetic field geometry and the effects of the field onthe circumstellar environment.

An analysis of the magnetic field geometry and its interaction with the circumstellar environment of HD 57682 by the MiMeS Collaboration