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

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

2010-09-21

arxiv.org/abs/1009.4083v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Proceedings of IAU 272: Active OB stars

Scientific paper

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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