Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..133b&link_type=abstract
NOAO Proposal ID #2001B-0133
Physics
Scientific paper
We propose a new, accelerated, search for relatively bright giants in the halo of the Milky Way with [Fe/H] ≤ -2.5. Our primary motivation for this search is the recent discovery of a second ``r- process enhanced'' star, CS 31082-001. This star is similar in many respects to the previously unique example of the phenomenon, CS 22892- 052, and exhibits [r-process/Fe] elemental ratios in excess of 30-50 times solar values. Both of these stars have measurable lines of the radioactive species thorium, based upon which estimates of the lower limit of the age of the Galaxy (and universe) have been made. CS 31082- 001, in contrast to CS 22892-052, is not carbon-enhanced, and thus permitted the first measurement of uranium abundance outside of the solar system. Based on previous high-resolution follow-up, the greatly r-process enhanced stars occur with a frequency of roughly 2-3% among [Fe/H] ≤ - 2.5 giants. A planned future high-resolution study of ~ 500 such stars will yield new detections of 10-15 highly r-process enhanced stars. The key to these discoveries is the identification of a sufficiently large number of [Fe/H] ≤ -2.5 giants, which we seek to initiate with this proposal, in collaboration with additional telescopes worldwide.
Beers Timothy
Carney Bruce
Christlieb Norbert
Norris John
Rhee Jaehyon
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