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Li-depleted (enhanced) stars in the main-sequence (MS) and (or) the RGB, posea puzzling mystery. Presently, there is still no clear answer to themechanism(s) that enables such Li depletion (enhancement). One possibleexplanation comes from the, still controversial, observational evidence of Liunderabundances in MS stars hosting planets, and of a positive correlationbetween the Li abundance and rotational velocity in some RGB stars, whichsuggests a stellar collision with a planet-like object as a possible solution.In this study we explore this scenario, performing for first time3D-hydrodynamical simulations of a 0.019 Mo brown dwarf collision with a MSstar under different initial conditions. This enables us to gather informationabout the impact on the physical structure and final Li content in the hostingstar.

3D Hydrodynamical Simulations of a Brown Dwarf Accretion by a Main-Sequence Star and its Impact on the Surface Li Abundance