red horizontal branch star
setâre-ye sorx-e šâxe-ye ofoqi
Fr.: étoile rouge de la branche horizontale
A star found on the red part of the → horizontal branch. According to theoretical models, these stars result from the evolution of stars with a mass around 0.8 Msun, higher than that giving rise to → BHB stars. Upon helium burning in their cores, the remnant envelope of the red giant collapses.