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| Paper: |
Molybdenum Abundances in Metal-Poor Stars |
| Volume: |
458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way |
| Page: |
75 |
| Authors: |
Peterson, R. C. |
| Abstract: |
Peterson (2011)
has analyzed HST spectra near 2000Å of five metal-poor turnoff
stars with mild enhancements of heavy r-process elements. Two stars,
HD 94028 and HD 160617, are unique in showing an extreme overabundance of
the light trans-ironic element molybdenum (Z = 42), but less extreme
enhancements of Zr (Z = 40) and Ru (Z = 44).
Of several nucleosynthesis scenarios that can
produce nuclei in this mass range in the oldest stars, a high-entropy wind
(HEW) acting in a core-collapse supernova seems uniquely capable of a high
overproduction confined to a narrow mass range. That this unusual elemental
distribution is achieved only under very limited physical conditions
suggests that very few individual nucleosynthesis events were
responsible for the synthesis of the light trans-ironic elements in these
stars, even though both are only moderately metal-poor. |
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