Abstract
Evolutionary tracks for Population II stars of low mass are presented. The chemical composition lie: in the range 0.50 < X <0.999 and 10- <Z < 10- . Isochrones suitable for comparison with color magnitude diagrams of globular clusters have been constructed. The results are compared with earlie work, in particular with models by Simoda and Iben and Iben and Rood. Discrepancies are everywber less than 12 percent, except for the stellar radii which are subject to larger uncertainties due to th hydrogen convection zones. The strong dependence on Z of the turnoff luminosity for very low Z foun by Simoda and Iben is confirmed qualitatively.
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