An Etymological Dictionary of Astronomy and Astrophysics
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A concentration, on the → horizontal branch, of → red giant stars that roughly have the same intrinsic brightness. These core → helium burning stars are the metal rich equivalents of the better known → horizontal branch stars. Theoretical models predict that their absolute luminosity only weakly depends on their age and chemical composition.

→ red; → clump.

A star on the → horizontal branch which results from the evolution of a → red giant with an initial mass of ~ 1 Msun.

→ red; → clump; → star.