Pal1-I elemental equivalent widths and abundances

It is the youngest Galactic GC and it has been tentatively associated to several of the substructures recently discovered in the Milky Way (MW), including the Canis Major (CMa) overdensity and the Galactic Anticenter Stellar Structure (GASS). In order to provide further insights into its origin, we present the first high resolution chemical abundance analysis for one red giant in Pal 1.

We obtained high resolution (R=30000) spectra for one red giant star in Pal 1 using the High Dispersion Spectrograph (HDS) mounted at the SUBARU telescope. We used ATLAS-9 model atmospheres coupled with the SYNTHE and WIDTH calculation codes to derive chemical abundances from the measured line equivalent widths of 18 among alpha, Iron-peak, light and heavy elements. The Palomar 1 chemical pattern is broadly compatible to that of the MW open clusters population and similar to disk stars.