The star CS 22892-052, discovered in the HK Objective-Prism survey of the southern Galactic halo, is extremely weak-lined at low resolution. At higher resolution, features of very heavy neutron-capture elements and CH dominate the spectrum. An abundance analysis reveals that this star is indeed very metal-poor: (Fe-peak/H) approximately -3.1. The alpha elements Mg, Ca, and Ti are enhanced by factors typical for halo stars, (alpha/Fe) approximately equal to +0.4. The neutron-capture elements are strongly overabundant: +0.3 less than (n-capture/Fe) less than +1.8 in the range 38 less than or equal to Z less than or equal to 68, with the enhancements generally growing with increasing Z. The ratio (C/Fe) approximately +1 also is much larger than in any other known star of this metallicity range. The total n-capture element distribution is well represented by an r-process nucleosynthesis yield. This star provides the clearest evidence for element enrichment from 'local' supernovae nucleosynthesis events in an unmixed early Galactic halo.
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Sneden et al. (1994) studied this question.