Mathematics – Logic
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9049d&link_type=abstract
HST Proposal ID #9049
Mathematics
Logic
Hst Proposal Id #9049 Cold Stars
Scientific paper
The extremely metal-poor { Fe/H -3.3 } star G64-12 shows a remarkable lithium {Li} abundance that is about 2 times larger than those seen in other warm metal-poor stars, from which the Big Bang Li abundance is inferred. This star's enhanced Li has resulted from either 1. Galactic Li enrichment from a lower Big Bang value, or 2. stellar depletion from a higher Big Bang value, with significant cosmological implications. We argue against two of the three prominent mechanisms of Galactic Li enrichment, leaving the theoretical Nu-process in Type II supernovae as the sole viable mechanism. This mechanism's crisp signature is the concomitant production of copious amounts of boron {B}; if the Nu-process enriched the material out which G64-12 formed with the extra Li observed today, then this star should also exhibit a large detectable B overabundance. B in G64-12 can only be observed from space, using HST/STIS. If this star's STIS-based B abundance lies above the established B-Fe trend, this would be the first observational evidence for the Nu-process. But if its B abundance lies near the B-Fe trend, this would provide direct evidence that G64-12 is an elusive fossil of a Big Bang Li abundance about 0.3 dex above currently favored values, providing consistency in standard Big Bang Nucleosynthesis between Li and D {but not 4He}. EITHER RESULT would be of fundamental importance to Astronomy.
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