Evolved Open Clusters in the Gaia era: the case of the Hyades

Evolved Open Clusters (OCs) are excellent tracers of the formation and evolution of the galaxy, as well as an ideal laboratory to test theories of star formation and evolution. In particular, nearby OCs are commonly used as benchmark objects to assess the determination of physical properties of field stars. We have designed a project to perform an in-depth study of the physical properties of a sample of benchmark evolved clusters inside a radius of 500 pc around the Sun. We aim to determine shape, radii, extinction, galactic velocity, age and chemical composition, using recent data from Gaia DR2, and complementary ground-based high resolution spectroscopic data. Here we present the first results of this project after the release of Gaia DR2 concerning the Hyades, the most nearby open cluster. We do a membership selection around a large region from the cluster center. And we perform a spectroscopic analysis of the cluster using HARPS spectra of main sequence stars and red giants. We obtain chemical abundances for 11 species with a typical precision of 0.01 dex