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Rup147 is the closest old open cluster, with a distance of less than 300 pcand an age of about 2.5Gyr. It is therefore well suited for testing stellarevolution models and for obtaining precise and detailed chemical abundanceinformation. We combined photometric and astrometric information coming fromliterature and the Gaia mission with very high-resolution optical spectra ofstars in different evolutionary stages to derive the cluster distance, age, anddetailed chemical composition. We obtained spectra of six red giants usingHARPS-N at the TNG. We also used ESO archive spectra of 22 main sequence stars,observed with HARPS at the 3.6m telescope. The very high resolution (115000)and the large wavelength coverage (about 380-680nm) of the twin instrumentspermitted us to derive atmospheric parameters, metallicity, and detailedchemical abundances of 23 species from all nucleosynthetic channels. Weemployed both equivalent widths and spectrum synthesis. We also re-derived thecluster distance and age using Gaia parallaxes, proper motions, and photometryin conjunction with the PARSEC stellar evolutionary models. We fully analysedthose stars with radial velocity and proper motion/parallax in agreement withthe cluster mean values. We also discarded one binary not previouslyrecognised, and six stars near the MS turn-off because of their high rotationvelocity. Our final sample consists of 21 stars (six giants and 15 MS stars).We measured metallicity (the cluster average [Fe/H] is +0.08, rms=0.07) andabundances of light, {\alpha}, Fe-peak, and neutron-capture elements. The Liabundance follows the expectations, showing a tight relation betweentemperature and abundance on the MS, at variance with M67, and we did notdetect any Li-rich giant. We confirm that Rup147 is the oldest nearby opencluster. This makes it very valuable to test detailed features of stellarevolutionary models.

The chemical composition of the oldest nearby open cluster Ruprecht 147