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C. Sneden (U. Texas, Austin), J.J. Cowan (U. Oklahoma), J.W. Truran (U. Chicago), T.C. Beers (Michigan State U.), J.E. Lawler (U. Wisconsin)
The ultra-metal-poor ([Fe/H] ~q --3.1) halo field giant CS~22892-052 has extremely large relative abundances of neutron-capture elements (e.g. [Eu/Fe]~~q +1.7). We have gathered HST-STIS spectra in the 2400--2900~Å\ wavelength region of this faint star, using a total of 60 individual spacecraft orbits. The final co-added spectrum has resolving power R~~q 30,000 and S/N~~ 30. We have detected strong transitions of elements of the so-called 3\rm rd neutron-capture peak, including Os, Pt, Au, and Pb. These are the heaviest stable neutron-capture elements of the Periodic Table. We will present abundances of these 3\rm rd neutron-capture peak elements, and tie them to previously-determined abundances of other (lighter) neutron-capture elements. This extensive abundance set will be employed to revisit the age of CS~22892-052 based upon the radioactive elements Th and U.