Discovery of a strong magnetic field in the rapidly rotating B2Vn star HR 7355
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.
- Publication:
-
Active OB Stars: Structure, Evolution, Mass Loss, and Critical Limits
- Pub Date:
- July 2011
- DOI:
- arXiv:
- arXiv:1009.4083
- Bibcode:
- 2011IAUS..272..204O
- Keywords:
-
- stars: magnetic fields;
- stars: rotation;
- stars: early-type;
- stars: circumstellar matter;
- stars: individual (HR 7355);
- techniques: polarimetric;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- Proceedings of IAU 272: Active OB stars