Beyond the two-infall model

Context. The recent Gaia Data Release 3 (DR3) represents an unparalleled revolution in Galactic archaeology, providing numerous radial velocities and chemical abundances for millions of stars as well all-sky coverage. Aims We present a new evolution model the disc components (high- low- α sequence stars) designed to reproduce abundance ratios provided by General Stellar Parametriser-spectroscopy module DR3 constrained detailed star formation (SF) histories both thick thin inferred from previous releases. Methods. Sophisticated modelling based on releases have found evidence narrow episodes enhanced SF time. Additionally, indicated presence young (massive) that show impoverishment several elements. In order these observables, we propose which is generated two distinct infall episodes. Hence, this study compare with predictions three-infall high- components. Results proposed nicely reproduces main features ratio [X/Fe] versus [M/H] (X=Mg, Si, Ca, Ti, ) different age bins considered Moreover, most gas – started ∼2.7 Gyr ago allowed us predict accurately population has experienced impoverishment. Conclusions. extended models APOGEE APOKASC data abundances. To aim, better trace (i) (ii) history