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

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arxiv 1009.4083 v1 pith:BXG4TYS4 submitted 2010-09-21 astro-ph.SR

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

M.E. Oksala , G.A. Wade , W.L.F. Marcolino , J. Grunhut , D.A. Bohlender , N. Manset , R.H.D. Townsend , the MiMeS Collaboration This is my paper
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keywords fieldstarmagneticobtainedstrongb-typeb2vncalled
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We report on the detection of a strong, organized magnetic field in the helium-variable early B-type star HR 7355 using spectropolarimetric data obtained with ESPaDOnS on CFHT by the MiMeS large program. We also present results from new V-band differential photometry obtained with the CTIO 0.9m telescope. We investigate the longitudinal field, using a technique called Least-Squares Deconvolution (LSD), and the rotational period of HR 7355. These new observations strongly support the proposal that HR 7355 harbors a structured magnetosphere similar to that in the prototypical helium-strong star, sigma Ori E.

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