An Etymological Dictionary of Astronomy and Astrophysics

A member of a population of blue stars appearing on the → horizontal branch in the → Hertzsprung-Russell diagram of the Galactic → halo populations and → globular clusters. Belonging to → spectral types B3 to A0,
they have evolved past the → red giant stage and are burning helium in their core.

See also: → blue; → horizontal; → branch, → star.