Exploring the Chemistry of the Milky Way with J-PLUS through the Colour-Colour and Colour-Magnitude Diagrams

In this study, we investigate the chemical composition of the Milky Way (MW) by examining the Colour-Magnitude Diagrams (CMDs) andColour-Colour Diagrams of its stellar populations. We use data from the Javalambre Photometric Local Universe Survey (J-PLUS), the LargeSky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST 1 ), and Gaia. The Colour-Colour Diagrams are designed to be sensitive to keystellar parameters: metallicity ([Fe/H]), effective temperature (T_eff), and surface gravity (log(g)), with these parameters derived from LAMOSTdata. Through the Colour-Colour Diagrams, we explore the distribution of stars based on metallicity, effective temperature, and surface gravity.The CMD, constructed using Gaia's parallax measurements and J-PLUS's photometric bands, helps us identify distinct regions and trace stars tospecific evolutionary phases. Future work will integrate stellar dynamics, such as proper motion, into the photometric analysis to identifydynamically distinct structures and unravel the history of our galaxy.