The rotation rates of 335 apparently single early B-type stars in the Tarantula nebula show a bimodal distribution, resembling that found for late-B and early-A type stars.
The origin of the bimodality remains unclear, although it is likely that magentic braking and binary interaction play a role.
Dufton & the VFTS collaboration (2013, A&A 550, 12)
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