ASTROPHYSICS AND SPACE SCIENCE, vol.192, no.2, pp.275-289, 1992 (SCI-Expanded)
A model of a first generation intermediate star of 5 M., with Z = 0 has been considered. The model is at an advanced stage of its evolution and has a double shell burning. It burns helium in the inner shell, and hydrogen, via CNO cycle, in the outer shell.