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We present detailed chemical abundances, radial velocities and orbitalparameters for FSR 1758, a recently discovered star cluster in the direction ofthe Galactic Bulge. High resolution (R~42,000) spectra were obtained using theMagellan/Clay telescope instrumented with MIKE echelle spectrogragh, wavelengthrange 4900-8700 \AA. Cluster membership was determined using Gaia DR2 propermotions and confirmed with our radial velocity measurements. We findmetallicity consistent with previous photometric estimates for this cluster,[Fe/H] = -1.58+-0.03 dex, with a small, 0.08 dex, spread. While other studieshave suggested this massive object may be the result of a previous accretionevent, our results are consistent with Milky Way Halo globular clusters withcharacteristic Na-O anti-correlations found for the metal-poor cluster members.The mean radial velocity of the cluster, +226.8+-1.6 km/s with a small velocitydispersion, 4.9+-1.2 km/s, is typical for globular clusters. We also confirm aretrograde Galactic orbit that appears to be highly eccentric.

astrophysical journal/the astrophysical journal

Detailed chemical composition and orbit of the new globular cluster  FSR1758: Implications for the accretion of the Sequoia dwarf galaxy onto the  Milky Way