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The B0.2 V magnetic star tau Sco stands out from the larger population ofmassive OB stars due to its high X-ray activity, peculiar wind diagnostics andcomplex magnetic field. Recently, Petit et al. 2011 presented the discovery ofthe first two tau Sco analogues -- HD 66665 and HD 63425, identified by thestriking similarity of their UV spectra to that of tau Sco. ESPaDOnS and Narvalspectropolarimetric observations were obtained by the Magnetism in MassiveStars CFHT and TBL Large Programs, in order to characterize the stellar andmagnetic properties of these stars. A magnetic field of similar surfacestrength was found on both stars, reinforcing the connection between thepresence of a magnetic field and wind peculiarities. We present additionalphase-resolved observations secured by the MiMeS collaboration for HD 66665 inorder to measure its magnetic geometry, and correlate that geometry withdiagnostics of mass-loss.

Characterizing the magnetic fields of the first tau Sco analogues