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OB star

(a hot star with class O or early B)

The term OB star is used to designate a star that is either an O-type star or a B-type star, generally meaning just the early B stars. The term can be thought of as an alternate spectral classification consisting of the hottest stars, but a bit broader than just "O". Some star surveys cover this class. Stellar associations where they form and commonly live are called OB associations.


(star type,spectral type)
http://en.wikipedia.org/wiki/OB_star

Referenced by:
HII region (HII)
OB association
Strömgren sphere

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