Discovery of the shortest rotational period, non-degenerate, magnetic massive star by the MiMeS Collaboration

J. H. Grunhut; G. A. Wade; T. Rivinius; W. L. F. Marcolino; R. Townsend; the MiMeS Collaboration

paper

Discovery of the shortest rotational period, non-degenerate, magnetic massive star by the MiMeS Collaboration

arXiv:1012.2360

Abstract

We discuss the recent detection of a strong, organized magnetic field in the bright, broad-line B2V star, HR 5907, using the ESPaDOnS spectropolarimeter on the CFHT as part of the Magnetism in Massive Stars (MiMeS) survey. We find a rotational period of 0.50833 days, making it the fastest-rotating, non-degenerate magnetic star ever detected. Like the previous rapid-rotation record holder HR 7355 (also discovered by MiMeS: Oksala et al. 2010, Rivinius et al. 2010), this star shows emission line variability that is diagnostic of a structured magnetosphere.

3 pages, 4 figures, to appear in the proceedings of Magnetic Stars 2010