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A new moderately r-process-enhanced metal-poor star, RAVE J093730.5-062655,has been identified in the Milky Way halo as part of an ongoing survey by theR-Process Alliance. The temperature and surface gravity indicate thatJ0937-0626 is likely a horizontal branch star. At [Fe/H] = -1.86, J0937-0626 isfound to have subsolar [X/Fe] ratios for nearly every light, alpha, and Fe-peakelement. The low [alpha/Fe] ratios can be explained by an ~0.6 dex excess ofFe; J0937-0626 is therefore similar to the subclass of "iron-enhanced"metal-poor stars. A comparison with Milky Way field stars at [Fe/H] = -2.5suggests that J0937-0626 was enriched in material from an event, possibly aType Ia supernova, that created a significant amount of Cr, Mn, Fe, and Ni andsmaller amounts of Ca, Sc, Ti, and Zn. The r-process enhancement of J0937-0626is likely due to a separate event, which suggests that its birth environmentwas highly enriched in r-process elements. The kinematics of J0937-0626, basedon Gaia DR2 data, indicate a retrograde orbit in the Milky Way halo; J0937-0626was therefore likely accreted from a dwarf galaxy that had significantr-process enrichment.

The R-Process Alliance: Discovery of a low-alpha, r-Process-Enhanced Metal-Poor Star in the Galactic Halo