Li-rich produced by element diffusion

Thus, the goal of this work is to propose the mechanism of A(Li) enrichment and achieve the consistency between the theoretical and observation data. In our model, the element diffusion mainly triggered by the gravity field changes the mean molecular weight at the junction zone between the stellar envelope and the He core, which makes the thermohaline mixing region expanding to the inner convection region of stars. A transport channel, efficiently transporting ^7^Be in the hydrogen burning region of the star to the convective envelope where ^7^Be decays into ^7^Li, is formed.

Combing a high constant diffusive mixing coefficients, the transport channel can explain the origin of Li-rich and super Li-rich giant, even the most super Li-rich giants.