Sakari, Charli MRoederer, Ian U.Placco, Vinicius MBeers, Timothy CEzzeddine, RanaFrebel, AnnaHansen, TereseSneden, ChrisCowan, John J.Wallerstein, GFreeman, Kenneth2022-05-022022-05-020004-637Xhttp://hdl.handle.net/1885/264216A 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 the R-Process Alliance. The temperature and surface gravity indicate that J0937−0626 is likely a horizontal branch star. At [Fe/H] = −1.86, J0937−0626 is found to have subsolar [X/Fe] ratios for nearly every light, α, and Fe-peak element. The low [α/Fe] ratios can be explained by an ~0.6 dex excess of Fe; J0937−0626 is therefore similar to the subclass of "iron-enhanced" metal-poor stars. A comparison with Milky Way field stars at [Fe/H] = −2.5 suggests that J0937−0626 was enriched in material from an event, possibly a Type Ia supernova, that created a significant amount of Cr, Mn, Fe, and Ni and smaller amounts of Ca, Sc, Ti, and Zn. The r-process enhancement of J0937−0626 is likely due to a separate event, which suggests that its birth environment was highly enriched in r-process elements. The kinematics of J0937−0626, based on Gaia DR2 data, indicate a retrograde orbit in the Milky Way halo; J0937−0626 was therefore likely accreted from a dwarf galaxy that had significant r-process enrichment.C.M.S. and G.W. acknowledge funding from the Kenilworth Fund of the New York Community Trust. V.M.P., T.C.B., R.E., A.F., and I.U.R. acknowledge partial support from grant PHY 14-30152 (Physics Frontier Center/JINA/CEE), awarded by the US National Science Foundation. I.U.R. acknowledges additional support from NSF grants AST 16-13536 and AST 18-15403. B.K.G. acknowledges the support of STFC, through the University of Hull’s Consolidated Grant ST/ R000840/1. E.K.G. gratefully acknowledges support via Sonderforschungsbereich SFB 881 “The Milky Way System” (subproject A5) of the German Research Foundation (DFG). Funding for RAVE has been provided by: the Leibniz-Institut für Astrophysik Potsdam (AIP); the Australian Astronomical Observatory; the Australian National University; the Australian Research Council; the French National Research Agency; the German Research Foundation (SPP 1177 and SFB 881); the European Research Council (ERC-StG 240271 Galactica); the Istituto Nazionale di Astrofisica at Padova; The Johns Hopkins University; the National Science Foundation of the USA (AST-0908326); the W. M. Keck foundation; the Macquarie University; the Netherlands Research School for Astronomy; the Natural Sciences and Engineering Research Council of Canada; the Slovenian Research Agency; the Swiss National Science Foundation; the Science & Technology Facilities Council of the UK; Opticon; Strasbourg Observatory; and the Universities of Groningen, Heidelberg and Sydney. The RAVE website is at https://www.rave-survey.org.application/pdfen-AU© 2019. The American Astronomical Society.Galaxy: formationstars: abundancesstars: atmospheresstars: fundamental parametersstars: individual (RAVE J093730.5-062655)201910.3847/1538-4357/ab0c022020-12-27