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

Published online by Cambridge University Press:  12 July 2011

Mary E. Oksala ,
Gregg A. Wade ,
Wagner L. F. Marcolino ,
Jason H. Grunhut ,
David Bohlender ,
Nadine Manset  and
Richard H. D. Townsend
Mary E. Oksala
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark, DE, USA Department of Physics, Royal Military College of Canada, Kingston, Ontario, Canada
Gregg A. Wade
Affiliation:
Department of Physics, Royal Military College of Canada, Kingston, Ontario, Canada
Wagner L. F. Marcolino
Affiliation:
LAM-UMR 6110, CNRS & Univ. de Provence, Marseille, France Observatòrio Nacional, Rio de Janeiro, Brazil
Jason H. Grunhut
Affiliation:
Department of Physics, Royal Military College of Canada, Kingston, Ontario, Canada Department of Physics, Queen's University, Kingston, Ontario, Canada
David Bohlender
Affiliation:
National Research Council of Canada, Herzberg Institute of Astrophysics, Victoria, Canada
Nadine Manset
Affiliation:
Canada-France-Hawaii Telescope Corporation, Kamuela, HI, USA
Richard H. D. Townsend
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, Madison, WI, USA
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Abstract

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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, σ Ori E.

Keywords

stars: magnetic fieldsstars: rotationstars: early-typestars: circumstellar matterstars: individual (HR 7355)techniques: polarimetric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 204 - 205
Copyright
Copyright © International Astronomical Union 2011

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