Any massive, hot star of spectral type O, B, or A. The designation ‘early’ derives from an old, mistaken idea that stars evolved from being hot and young to cool and old. The term is also used to refer to the hotter end of any given spectral class: for example, a K1 star is earlier than a K5 star. See also Late-type Star.
Subjects: Astronomy and Astrophysics.