Evolved Open Clusters in the Gaia era: the case of Ruprecht 147

Open Clusters (OCs), and in particular the oldest ones, have been widely used to test formation and evolution theories of the galaxy. Also, since their HR diagrams provide an snapshot of stellar evolution, they are very good targets to investigate stellar formation and evolution models, together with dynamical interactions among stars. In particular, the most nearby ones profit from the best accuracies in astrometry, photometry and spectroscopy, and therefore they are commonly used as benchmark targets to assess performances of methods and calibrate results. Our project is devoted to perform an in-depth study of the physical properties of a sample of benchmark evolved clusters inside a radius within 500 pc around the Sun. Our aim is to revisit their properties of shape, radii, extinction, galactic velocity, age and chemical composition, using recent data release from Gaia, complemented with ground-based high resolution spectroscopic data. Here we present the first results of this project after the release of Gaia DR2 concerning the cluster Ruprecht 147, the oldest nearby OC. We do a membership selection taking into account proper motions, parallax and photometry of the stars in a region of 4 deg radius around the center of the cluster. We study the peculiar kinematics of this cluster compared to the field stars in the solar neighbourhood. Finally, we do a spectroscopic analysis of the cluster using HARPS and HARPSN spectra for 5 main sequence stars and 6 red giants. We obtain preliminary chemical abundances for 8 species, pointing that the cluster has in general solar abundances