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The study of lithium (Li) surface abundance in the Sun and young stellarglobular clusters which are seemingly anomalous in present-day scenarios, aswell as the influence of rotation and magnetic braking (MB) on its depletionduring pre-main sequence (PMS) and main sequence (MS). In this work, theeffects of rotational mixing and of the rotational hydrostatic effects on Liabundances are studied by simulating several grids of PMS and MS rotating andnon-rotating models. Those effects are combined with the additional impact ofthe MB (with magnetic field intensities ranging between 3.0 and 5.0 G). Thedata obtained from simulations are confronted by comparing different stellarparameters. The results show that the surface Li abundance for the Sun likemodels at the end of the PMS and throughout the MS decreases when rotationaleffects are included, i.e. the Li depletion rate for rotating models is higherthan for non-rotating ones. This effect is attenuated when the MB produced by amagnetic field is present. This physical phenomena impacts also the stareffective temperature ($T_{\mathrm{eff}}$) and its location in the HR diagram.The impact of MB in Li depletion is sensitive to the magnetic field intensity:the higher it is, the lower the Li destruction. A direct link between themagnetic fields and the convective zone (CZ) size is observed: strongermagnetic fields produce shallower CZ's. This result suggests that MB effectmust be taken into consideration during PMS if we aim to reproduce Liabundances in young clusters.

Study of the effects of magnetic braking on the lithium abundances of the Sun and solar-type stars