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High-resolution spectral analysis is performed for the first time in evolvedstars of two young open clusters: NGC 4609 and NGC 5316, of about 80 and 100Myr in age, respectively, and turn-off masses above 5 Msun. Stellar evolutionmodels predict an extra-mixing event in evolved stars, which follows the firstdredge-up and happens later on the red giant branch. However, it is still notunderstood how this process affects stars of different masses. In this study,we determine abundances of the mixing sensitive elements carbon and nitrogen,carbon isotope 12C/13C ratios, as well as 20 other elements produced bydifferent nucleosynthetic processes (O, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co,Ni, Y, Zr, Ba, La, Ce, Pr, Nd, and Eu). We compared our results with the latesttheoretical models of evolutionary mixing processes. We find that the obtained12C/13C and C/N ratios and [Na/Fe] agree quite well with the model which takesinto account thermohaline- and rotation-induced mixing but within error limitsalso agree with the standard first dredge-up model. Comparison of oxygen,magnesium and other alpha-elements with theoretical models of Galactic chemicalevolution revealed that both clusters follow the thin disk alpha-elementtrends. Neutron-capture element abundances in NGC 4609 are apparentlyreflecting its birthplace in the thin disk, while NGC 5316 has marginallyhigher abundances, which would indicate its birthplace in an environment moreenriched with neutron-capture elements.

Chemical composition of evolved stars in the young open clusters NGC 4609 and NGC 5316