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		| Paper: | 
		σ Ori E: The Archetypal Rigidly Rotating Magnetosphere | 
	 
	
		| Volume: | 
		361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics | 
	 
	
		| Page: | 
		110 | 
	 
	
		| Authors: | 
		Townsend, R.H.D. | 
	 
	
	
		| Abstract: | 
		I review the basic concepts of the Rigidly Rotating Magnetosphere model for the circumstellar plasma distribution around the helium-strong star σ Ori E. I demonstrate that the model can furnish a good fit to the photometric, spectroscopic and magnetic variability exhibited by this star, and argue that the variability of other helium-strong stars may be amenable to a similar interpretation. | 
	 
	
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