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		| Paper: | 
		Initial Conditions for Reaching Critical Velocity (Invited Review) | 
	 
	
		| Volume: | 
		361, Active OB-Stars: Laboratories For Stellar and Circumstellar Physics | 
	 
	
		| Page: | 
		325 | 
	 
	
		| Authors: | 
		Meynet, G.; Ekstroem, S.; Maeder, A.; Barblan, F. | 
	 
	
	
		| Abstract: | 
		The aim of this paper is to determine the initial rotational velocities required on the ZAMS for single stars to reach the critical velocity, sometimes called the break-up velocity, during the Main-Sequence (MS) phase. Some useful relations between Ω/Ωcrit, v/vcrit (v is the velocity at the equator), the moments of inertia, the angular momenta, the kinetic energy in the rotation and various other basic physical quantities are obtained. | 
	 
	
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