0 Assigned ID: 74 ----- Attempting Submission 1 (Tue Apr 08 20:03:50 GMT 2014) ----- We propose to use archive STIS spectra to study the abundances of several rare elements produced by neutron-capture reactions in an s-process environment. Lines of Cd I and II, Lu II, Os I, Pt I, Hg II, and Pb I are present in existing NUV spectra of the low-metallicity subgiant HD 94028, and many other species have been derived previously from optical spectra. We will use these data to compare against predictions of s-process nucleosynthesis operating in low-metallicity stars in the AGB phase of evolution. No such study has been conducted previously, and these results will provide the first observational constraints on the s-process nucleosynthesis reaction networks for Ge, As, Se, Cd, Lu, Os, Pt, and Hg. COOL STARS Default Small false true false false false SUPPORTED