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

  • Mary E. Oksala (a1) (a2), Gregg A. Wade (a2), Wagner L. F. Marcolino (a3) (a4), Jason H. Grunhut (a2) (a5), David Bohlender (a6), Nadine Manset (a7), Richard H. D. Townsend (a8) and the MiMeS Collaboration...

Abstract

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, σ Ori E.

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References

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