  The study of lithium (Li) surface abundance in the Sun and young stellar
globular clusters which are seemingly anomalous in present-day scenarios, as
well as the influence of rotation and magnetic braking (MB) on its depletion
during pre-main sequence (PMS) and main sequence (MS). In this work, the
effects of rotational mixing and of the rotational hydrostatic effects on Li
abundances are studied by simulating several grids of PMS and MS rotating and
non-rotating models. Those effects are combined with the additional impact of
the MB (with magnetic field intensities ranging between 3.0 and 5.0 G). The
data obtained from simulations are confronted by comparing different stellar
parameters. The results show that the surface Li abundance for the Sun like
models at the end of the PMS and throughout the MS decreases when rotational
effects are included, i.e. the Li depletion rate for rotating models is higher
than for non-rotating ones. This effect is attenuated when the MB produced by a
magnetic field is present. This physical phenomena impacts also the star
effective 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 the
magnetic fields and the convective zone (CZ) size is observed: stronger
magnetic fields produce shallower CZ's. This result suggests that MB effect
must be taken into consideration during PMS if we aim to reproduce Li
abundances in young clusters.
