  The paper discusses the solution of a simple kinetic equation of the type
used for the computation of the change of the chemical composition in stars
like the Sun. Starting from the standard form of the kinetic equation it is
generalized to a fractional kinetic equation and its solutions in terms of
H-functions are obtained. The role of thermonuclear functions, which are also
represented in terms of G- and H-functions, in such a fractional kinetic
equation is emphasized. Results contained in this paper are related to recent
investigations of possible astrophysical solutions of the solar neutrino
problem.
