Emission Line Magnetospheres Around Early Type Stars

About ten years ago, only two early type stars were known to possess a magnetically governed circumstellar environment: 
The O star theta1 Ori C and the B star sigma Ori E. This situation has changed dramatically. All five O stars with a confirmed 
magnetic field also have magnetically strongly affected winds. In addition, the number of B stars with a magnetosphere seen 
in line emission or absorption has reached almost a dozen. In this presentation, I will work out a scheme of commonalities 
and differences between those magnetically governed circumstellar environments, and how these morphological traits may 
reflect underlying physical processes.