Key points are not available for this paper at this time.
A time-dependent 'convective diffusion' algorithm has been coupled for the first time with a self-consistent full evolutionary computation in order to investigate theoretically the creation of superrich lithium stars on the asymptotic giant branch. Stars of 3, 4, 5, 6, and 7 solar mass stars were considered for Z = 0.02 and Z = 0.001. Superrich lithium stars were produced when convective envelope base temperatures exceeded 50 x 10 exp 6 K. Abundances of log epsilon (7Li) about 4.5 were obtained for stars of mass 4-6 solar masses, lying in the luminosity range M(bol) about -6 to -7, in excellent agreement with observations. High lithium abundances persist for 10 exp 4 - 10 exp 5 yr. The superrich lithium abundances are independent of the star's earlier lithium history.
Sackmann et al. (Mon,) studied this question.