SIMBAD references

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_☉.