(a) Gas (G), (b) stars (S), and (c) locked-in matter (L) compartments as well as (d) the formation rate $\mathring{J}(t)$ of new stars in the course of time t, at zero star formation from the interaction between gas and stars, a(t) = 0. We show five choices for b₀ and c₀, while β₀ = 1 and η = 10⁻⁵. The numerical solution of Eqs. (7)–(9) coincides exactly with the analytical solution provided by Eqs. (19)–(21), and (24).