AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 63. Evolution of Chemical Abundances over Cosmic Time
Topical, Oral, Wednesday, June 2, 1999, 8:30-10:00am, 10:45am-12:30pm, 2:00-3:30pm, 3:45-5:30pm, Continental Ballroom A

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[63.03] Halo Stars

R.P. Kraft (UCO/Lick Observatory)

The Galactic halo field and the globular clusters contain the oldest known stars, and thus analyses of their metallicities ([Fe/H]) and [el/Fe]-ratios provide important clues to the origin of the chemical elements. Several relevant topics will be touched on in this talk: (1) Variations in the [el/Fe]-ratios among halo stars with metallicities below that of the most metal-poor globular clusters; (2) How reliable are determinations of [el/Fe]-ratios among metal-poor stars? Case in point: [O/Fe] as [Fe/H] declines; (3) Anomalies in the [Ba/Eu]-ratio (or s- to r-process species); (4) Abundance ratios in halo field stars vs globular cluster stars; (5) Use of Fe-surrogates in low-resolution studies.

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