Ultrametal-poor halo stars: The remarkable spectrum of CS 22892-052

Details Ultrametal-poor halo stars: The remarkable spectrum of CS 22892-052 Ultrametal-poor halo stars: The remarkable spectrum of CS 22892-052

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...431l..27s&link_type=abstract

The Astrophysical Journal, Part 2 - Letters, vol. 431, no. 1, p. L27-L30

Other

78

Galactic Halos, Globular Clusters, Star Formation, Stellar Composition, Supernovae, Abundance, Metallicity, Nuclear Fusion, Nuclear Interactions, Stellar Atmospheres

Scientific paper

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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