I'm reading and enjoying S.Chandrasekhar's book on stellar structure
(Dover).
I just finished the chapter on the Hertzsprung-Russell diagram and noted
that
at the time he wrote the book (around 1939) there was no good theory of
the transmutation reactions taking place inside the star. I was just
wondering
what I should read that would bring the material in that chapter up to
date,
if not the book itself.

Try

Burbidge, E. M., Burbidge, G. R., Fowler, W. A. & Hoyle, F., (1957) Rev.
Mod. Phys. 29, 547.


DaveL