Astrophysics (index)about

OB star

(a hot star with class O or 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 hotter B stars. It represents the hottest stars as a class a bit broader than just "O". Some star surveys cover this class.

(star type,spectral type)

Referenced by:
HII region (HII)
Strömgren sphere