The chemical composition of the stellar cluster Gaia1: no surprise
  behind Sirius
  We observed 6 He-clump stars of the intermediate-age stellar cluster Gaia1
with the MIKE/MAGELLAN spectrograph. A possible extra-galactic origin of this
cluster, recently discovered thanks to the first data release of the ESA Gaia
mission, has been suggested, based on its orbital parameters. Abundances for
Fe, alpha, proton- and neutron-capture elements have been obtained. We find no
evidence of intrinsic abundance spreads. The iron abundance is solar
([FeI/H]=+0.00 +-0.01; sigma = 0.03 dex). All the other abundance ratios are,
by and large, solar-scaled, similar to the Galactic thin disk and open clusters
stars of similar metallicity. The chemical composition of Gaia1 does not
support an extra-galactic origin for this stellar cluster, that can be
considered as a standard Galactic open cluster.
