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At a Galactocentric distance of 27 kpc, Pal 13 is an old globular cluster(GC) in the outer halo. We present a chemical abundance analysis of this remotesystem from high-resolution spectra obtained with Keck/HIRES. Owing to the lowsignal-to-noise ratio of the data, our analysis is based on a coaddition of thespectra of 18 member stars. We are able to determine integrated abundanceratios for 16 species of 14 elements, of $\alpha$-elements (Mg,Si,Ca,Ti),Fe-peak (Sc,Mn,Cr,Ni,Cu,and Zn), and n-capture elements (Y,Ba). While the meanNa abundance is found to be slightly enhanced and halo-like, our method doesnot allow us to probe an abundance spread that would be expected in this lightelement if multiple populations are present in Pal 13. We find a metal-poormean metallicity of $-1.91\pm0.05$ (statistical) $\pm$ 0.22 (systematic),confirming that Pal 13 is a typical metal-poor representative of the outerhalo. While there are some differences between individual $\alpha$-elements,such as halo-like Mg and Si versus the mildly lower Ca and Ti abundances, themean [$\alpha$/Fe] of 0.34$\pm$0.06 is consistent with the marginally lower$\alpha$ component of the halo field and GC stars. We discuss our results inthe context of other objects in the outer halo and consider which of theseobjects were likely accreted. We also discuss the properties of theirprogenitors. While chemically, Pal 13 is similar to Gaia-Enceladus and some ofits GCs, this is not supported by its kinematic properties. Moreover, itschemodynamical similarity with NGC 5466, a progeny of the Sequoia accretionevent, might indicate a common origin in this progenitor. However, theambiguities in the full abundance space of this comparison emphasize thedifficulties in unequivocally labeling a single GC as an accreted object, letalone assigning it to a single progenitor. (Abridged)

An outer shade of Pal: Abundance analysis of the outer halo globular cluster Palomar 13