Emission from the Centrifugal Magnetospheres of Magnetic B-type Stars
  Approximately 10% of B-type stars possess strong magnetic fields, and of these, 25% host centrifugal magnetospheres (CMs) in which the radiative wind, magnetic field, and rotational support interact to form a dense circumstellar plasma visible in a variety of diagnostic lines. In this article we review the basic theory behind CMs, outline current theoretical and observational problems, compare the observational properties of CM host stars to those of classical Be stars, and finally present preliminary results of a population study aimed at clarifying the characteristics of this growing sub-class. 
Matt Shultz, Gregg Wade, Thomas Rivinius, Richard Townsend, the MiMeS   Collaboration
astro-ph.SR