1995A&A...298..827C

Previous evolutionary computations concerning stars with masses in the range of the "Red Giants Transition Phase" are extended to lower metallicities. Clusters isochrones for two values of the metallicity Z (Z=10^–4, 4.10^–4) and for ages down to 1 billion years are presented, discussing selected evolutionary features characterizing the structure of the stars during both H or He burning phases. One finds that clusters with Z≃10^–4 and with an age around 1-2 billion years could be characterized by the occurrence of anomalous He burning variables at a luminosity of the order of Log L=2.0-2.2L_☉.