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Star clusters, particularly those objects in the disk-bulge-halo interfaceare as of yet poorly charted, albeit carrying important information about theformation and the structure of the Milky Way. Here, we present a detailedchemical abundance study of the recently discovered object Gaia 1. Photometryhas previously suggested it as an intermediate-age, moderately metal-richsystem, although the exact values for its age and metallicity remainedambiguous in the literature. We measured detailed chemical abundances of 14elements in four red giant members, from high-resolution (R=25000) spectra thatfirmly establish Gaia 1 as an object associated with the thick disk. Theresulting mean Fe abundance is $-0.62\pm$0.03(stat.)$\pm$0.10(sys.) dex, whichis more metal-poor than indicated by previous spectroscopy from the literature,but it is fully in line with values from isochrone fitting. We find that Gaia 1is moderately enhanced in the $\alpha$-elements, which allowed us toconsolidate its membership with the thick disk via chemical tagging. Thecluster's Fe-peak and neutron-capture elements are similar to those foundacross the metal-rich disks, where the latter indicate some level of$s$-process activity. No significant spread in iron nor in other heavy elementswas detected, whereas we find evidence of light-element variations in Na, Mg,and Al. Nonetheless, the traditional Na-O and Mg-Al (anti-)correlations,typically seen in old globular clusters, are not seen in our data. Thisconfirms that Gaia 1 is rather a massive and luminous open cluster than alow-mass globular cluster. Finally, orbital computations of the target starsbolster our chemical findings of Gaia 1's present-day membership with the thickdisk, even though it remains unclear, which mechanisms put it in that place.

Detailed chemical abundance analysis of the thick disk star cluster Gaia 1