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We present a nearly complete rapid neutron-capture process (r-process)chemical inventory of the metal-poor ([Fe/H] = -1.46 +/- 0.10)r-process-enhanced ([Eu/Fe] = +1.32 +/- 0.08) halo star HD 222925. Thisabundance set is the most complete for any object beyond the solar system,totaling 63 metals detected and 7 with upper limits. It comprises 42 elementsfrom 31 <= Z <= 90, including elements rarely detected in r-process-enhancedstars, such as Ga, Ge, As, Se, Cd, In, Sn, Sb, Te, W, Re, Os, Ir, Pt, and Au.We derive these abundances from an analysis of 404 absorption lines inultraviolet spectra collected using the Space Telescope Imaging Spectrograph onthe Hubble Space Telescope and previously analyzed optical spectra. A series ofappendices discusses the atomic data and quality of fits for these lines. Ther-process elements from Ba to Pb, including all elements at the third r-processpeak, exhibit remarkable agreement with the Solar r-process residuals, with astandard deviation of the differences of only 0.08 dex (17%). In contrast,deviations among the lighter elements from Ga to Te span nearly 1.4 dex, andthey show distinct trends from Ga to Se, Nb through Cd, and In through Te. Ther-process contribution to Ga, Ge, and As is small, and Se is the lightestelement whose production is dominated by the r-process. The lanthanidefraction, log(X_La) = -1.39 +/- 0.09, is typical for r-process-enhanced starsand higher than that of the kilonova from the GW170817 neutron-star mergerevent. We advocate adopting this pattern as an alternative to the Solarr-process-element residuals when confronting future theoretical models ofheavy-element nucleosynthesis with observations.

the astrophysical journal. supplement series/astrophysical journal. supplement series

The R-Process Alliance: A Nearly Complete R-Process Abundance Template  Derived from Ultraviolet Spectroscopy of the R-Process-Enhanced Metal-Poor  Star HD 222925