2025A&A...698A.289O

Context. Abundances of M dwarfs, the most numerous stellar type in the Galaxy, can enhance our understanding of planet formation processes. They can also be used to study the chemical evolution of the Galaxy, where α-capture elements play a particularly important role.
Aims. We aim to obtain the abundances of Fe, Ti, and Ca for a small sample of well-known M dwarfs for which interferometric measurements are available. These stars and their abundances are intended to serve as a benchmark for future large-scale spectroscopic studies.
Methods. We analysed spectra obtained with the GIANO-B spectrograph. Turbospectrum and the wrapper TSFitPy were used with MARCS atmospheric models to fit synthetic spectra to the observed spectra. We performed a differential abundance analysis in which we also analysed a solar spectrum using the same method and then subtracted the derived abundances line by line. The median was taken as the final abundance of each element and each star.
Results. Our abundances of Fe, Ti, and Ca mostly agree within the uncertainties with other values from the literature. However, there are few studies to compare with.