CS 22892--052: A Rosetta Star for the Age and Early History of the Galaxy

Details CS 22892--052: A Rosetta Star for the Age and Early History of the Galaxy CS 22892--052: A Rosetta Star for the Age and Early History of the Galaxy

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8111s&link_type=abstract

HST Proposal ID #8111

Mathematics

Logic

Hst Proposal Id #8111 Cool Stars

Scientific paper

We propose to observe the ultra-metal-poor Galactic halo star CS 22892--052 and to produce the most complete abundance distribution of the heaviest stable elements, including platinum, osmium and lead, of any star outside of the Sun. These HST abundance data will then be used to estimate the initial abundance of the long-lived radioactive element thorium and, in comparison with its observed abundance, will be used to determine the age of this very old star. These studies, using radioactive chronometers in stars, provide an age estimate for the Galaxy independent of globular cluster and cosmological ages. Our proposed observations of CS 22892-- 052 will also provide significant new information about the early history of the Galaxy, specifically the nature of the earliest generations of stars and the types of nucleosynthetic processes that occurred in those stars.

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