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Binary evolution is investigated as the source for the extreme horizontalbranch (EHB) stars in the old and metal rich open cluster NGC~6791. Employingan updated version of our binary stellar evolution code we demonstrate that EHBstars naturally emerge from the common envelope phase. In sum, the binary modelreproduces the observed ($T_{\rm{eff}}$, $\log{g}$) and temporal properties ofthe EHB over-density tied to NGC 6971, without needing an ad-hoc and anomalousmass-loss prescription.

Binarity as the solution to the stellar evolution enigma posed by NGC 6791