"Not too old" metal deficient stellar populations: the case of metallicity Z=0.00001
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We investigate the evolution of metal deficient stellar structures, presenting H-burning isochrones covering cluster ages from 800 Myr to 7 Gyr. Evolutionary evidences for selection effects in the metallicity distribution of very metal poor H-burning red giants are reported. The evolution of stars during central and shell He burning is further investigated, discussing the occurrence of He burning pulsators as a function of cluster age.
11 pages, 8 encapsulated Postscript figures. Accepted for publication on A&A main journal
11 pages, 8 encapsulated Postscript figures. Accepted for publication on A&A main journal