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We investigated almost 500 stars distributed among 193 binary or multiplesystems made of late-F, G-, or early-K primaries and late-K or M dwarfcompanion candidates. For all of them, we compiled or measured coordinates,J-band magnitudes, spectral types, distances, and proper motions.With thesedata, we established a sample of 192 physically bound systems. In parallel, wecarried out observations with HERMES/Mercator and obtained high resolutionspectra for the 192 primaries and five secondaries. We used these spectra andthe automatic StePar code for deriving precise stellar atmospheric parameters:Teff, log g, Vmicro, and chemical abundances for 13 atomic species, including[Fe/H]. After computing Galactocentric space velocities for all the primarystars, we performed a kinematic analysis and classified them in differentGalactic populations and stellar kinematic groups of very different ages, whichmatch our own metallicity determinations and isochronal age estimations. Inparticular, we identified three systems in the halo and 33 systems in the youngLocal Association, Ursa Major and Castor moving groups, and IC 2391 and HyadesSuperclusters. We finally studied the exoplanet-metallicity relation in our 193primaries and made a list 13 M-dwarf companions with very high metallicity thatcan be the targets of new dedicated exoplanet surveys. All in all, our datasetwill be of great help for future works on the accurate determination ofmetallicity of M dwarfs.

monthly notices of the royal astronomical society

Calibrating the metallicity of M dwarfs in wide physical binaries with  F-, G-, and K- primaries - I: High-resolution spectroscopy with HERMES:  stellar parameters, abundances, and kinematics