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The lithium abundance, A(Li), in stellar atmospheres suffers from variousenhancement and depletion processes during the star's lifetime. While severalstudies have demonstrated that these processes are linked to the physics ofstellar formation and evolution, the role that Galactic-scale events play inthe galactic A(Li) evolution is not yet well understood. We aim to demonstratethat the observed A(Li) bi-modal distribution, in particular in the FGK-dwarfpopulation, is not a statistical artefact and that the two populations connectthrough a region with a low number of stars. We also want to investigate therole that Galactic-scale events play in shaping the A(Li) distribution of starsin the thin disk. We use statistical techniques along with a Galactic chemicalevolution model for A(Li) that includes most of the well-known $^7$Liproduction and depletion channels. We confirm that the FGK main-sequence starsbelonging to the Milky Way's thin disk present a bi-modal A(Li) distribution.We demonstrate that this bi-modality can be generated by a particular Milky Waystar formation history profile combined with the stellar evolution's $^7$Lidepletion mechanisms. We show that A(Li) evolution can be used as an additionalproxy for the star formation history of our Galaxy.

The bi-modal $^7$Li distribution of the Milky Way's thin-disk dwarf stars: The role of Galactic-scale events and stellar evolution