VAN DER SWAELMEN, Mathieu Benoit JeanMathieu Benoit JeanVAN DER SWAELMENViscasillas Vázquez, C.C.Viscasillas VázquezCESCUTTI, GabrieleGabrieleCESCUTTIMAGRINI, LauraLauraMAGRINICRISTALLO, SergioSergioCRISTALLOVESCOVI, DiegoDiegoVESCOVIRANDICH, Maria SofiaMaria SofiaRANDICHTautvaišienė, G.G.TautvaišienėBagdonas, V.V.BagdonasBensby, T.T.BensbyBergemann, M.M.BergemannBRAGAGLIA, AngelaAngelaBRAGAGLIADrazdauskas, A.A.DrazdauskasJiménez-Esteban, F.F.Jiménez-EstebanGuiglion, G.G.GuiglionKorn, A.A.KornMasseron, T.T.MasseronMinkeviiūtė, R.R.MinkeviiūtėSmiljanic, R.R.SmiljanicSpina, L.L.SpinaStonkutė, E.E.StonkutėZAGGIA, SimoneSimoneZAGGIA2023-07-062023-07-0620230004-6361http://hdl.handle.net/20.500.12386/34262Context. A renewed interest in the origin of r-process elements has been stimulated by the multi-messenger observation of the gravitational event GW170817, with the detection of both gravitational waves and electromagnetic waves corresponding to the merger of two neutron stars. Such a phenomenon has been proposed as one of the main sources of the r-process. However, the origin of the r-process elements at different metallicities is still under debate. <BR /> Aims: We aim at investigate the origin of the r-process elements in the Galactic thin-disc population. <BR /> Methods: From the sixth internal data release of the Gaia-ESO, we have collected a large sample of Milky Way (MW) thin- and thick-disc stars for which abundances of Eu, O, and Mg are available. The sample consists of members of 62 open clusters (OCs), located at a Galactocentric radius between ∼5 kpc and ∼20 kpc in the disc, in the metallicity range [ − 0.5, 0.4], and covering an age interval from 0.1 to 7 Gy, and about 1300 Milky Way disc field stars in the metallicity range [ − 1.5, 0.5]. We compare the observations with the results of a chemical evolution model, in which we varied the nucleosynthesis sources for the three elements considered. <BR /> Results: Our main result is that Eu in the thin disc is predominantly produced by sources with short lifetimes, such as magneto-rotationally driven SNe. There is no strong evidence for additional sources at delayed times. <BR /> Conclusions: Our findings do not imply that there cannot be a contribution from mergers of neutron stars in other environments, as in the halo or in dwarf spheroidal galaxies, but such a contribution is not needed to explain Eu abundances at thin-disc metallicities.STAMPAenArticle10.1051/0004-6361/2022437642-s2.0-85148663285https://www.aanda.org/articles/aa/full_html/2023/02/aa43764-22/aa43764-22.htmlhttp://arxiv.org/abs/2207.14747v12023A&A...670A.129VFIS/05 - ASTRONOMIA E ASTROFISICA