Evolution of the main stellar parameters from the Baraffe et al. (1998)’s models for 1 M_⊙ (solid line), 0.8 M_⊙ (dotted line), and 0.5 M_⊙ (dashed line). Upper panel, from left to right: stellar radius (in solar unit), moment of inertia (in solar unit, I_⊙ = 6.411 × 10⁵³ g cm^-2), and moment of inertia of the convective envelope (in stellar unit). Lower panel, from left to right: the radiative core’s moment of inertia, radius, and mass (in stellar unit).