Detailed chemical composition of wide FGK+M binary systems

Detailed chemical composition of stars is of prime interest for a range of topics in modern stellar astrophysics, such as the chemical evolution of the Galaxy or the formation, composition, and structure of exoplanets. In this work, we derive the C and O abundances and update Sc, V, Mn, and Co abundances considering hyperfine structure (HFS) effects for the 192 primary stars in FGK+M wide binary systems by means of the equivalent width (EW) method and high-resolution spectroscopic data, complementing the previous study of several elements (Fe, Mg, Si, Ca, Ti, Cr, Ni, Na, and Al). These individual abundances are extrapolated to the secondary M dwarfs, whose spectra are complex and notoriously difficult to model due to the presence of prominent molecular features. Lastly, we computed abundance calibrations which allow us to estimate individual abundances for M dwarfs using spectral indices computed from low-resolution spectra. In conclusion, this work covers the study of chemical abundances in FGK stars and expands it to the M dwarfs, providing a new method to estimate their chemical composition.