High-resolution elemental abundance analysis of the open cluster IC

Accepted. Received; in original form The existence of a kinematically defined moving group of stars centred at U =-40, V =-17 km s−1 referred to as the Hyades Supercluster, has been suggested as the debris of an originally large star forming event, with its core being the present day Hyades open cluster. Using high-resolution UVES spectra, we present elemental abundances for a range of alpha, Fe-peak and neutron-capture elements for 26 proposed superclus-ter stars. Our results show that the sample stars display a heterogeneous abundance distribution, with a clump around [Fe/H] = +0.15. We also calculate stellar radial velocities and U,V,W space velocities. Enforcing a strict chemical and kinematical membership criteria, we find 4 supercluster stars share the Hyades open cluster abun-dances and kinematics, while many of the remaining stars fit the disc field kinematics and abundance range. We discuss our findings in the context of the Hyades super-cluster being a dispersed star-forming remnant, a stellar stream of purely dynamical origin or a result of several processes