blue horizontal branch star — An Etymological Dictionary of Astronomy and Astrophysics

blue horizontal branch star

ستاره‌ی ِ آبی ِ شاخه‌ی ِ افقی

setâre-ye âbi-ye šâxe-ye ofoqi

Fr.: étoile bleue de la branche horizontale

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.

An Etymological Dictionary of Astronomy and Astrophysics