We have obtained high-resolution spectra of 32 giants in the open cluster NGC 7789 using the Wisconsin–Indiana–Yale–NOAO Hydra spectrograph .
We explore differences in atmospheric parameters and elemental abundances caused by the use of the linelist developed for the Gaia-ESO Survey ( GES ) compared to one based on Arcturus used in our previous work .
[ Fe/H ] values decrease when using the GES linelist instead of the Arcturus-based linelist ; these differences are probably driven by systematically lower ( \sim –0.1 dex ) GES surface gravities .
Using the GES linelist we determine abundances for 10 elements—Fe , Mg , Si , Ca , Ti , Na , Ni , Zr , Ba , and La .
We find the cluster ’ s average metallicity [ Fe/H ] = 0.03 \pm 0.07 dex , in good agreement with literature values , and a lower [ Mg/Fe ] abundance than has been reported before for this cluster ( 0.11 \pm 0.05 dex ) .
We also find the neutron-capture element barium to be highly enhanced— [ Ba/Fe ] = +0.48 \pm 0.08—and disparate from cluster measurements of neutron-capture elements La and Zr ( -0.08 \pm 0.05 and 0.08 \pm 0.08 , respectively ) .
This is in accordance with recent discoveries of supersolar Ba enhancement in young clusters along with more modest enhancement of other neutron-capture elements formed in similar environments .