The End of Nucleosynthesis: Production of Lead and Thorium in the Early Galaxy

@article{Roederer2009TheEO,
  title={The End of Nucleosynthesis: Production of Lead and Thorium in the Early Galaxy},
  author={Ian U. Roederer and Karl Ludwig Kratz and Anna Frebel and Norbert Christlieb and Bernd Pfeiffer and J. J. Cowan and Christopher Sneden},
  journal={The Astrophysical Journal},
  year={2009},
  volume={698},
  pages={1963-1980}
}
We examine the Pb and Th abundances in 27 metal-poor stars (−3.1 56) enrichment was produced only by the rapid (r-) nucleosynthesis process. New abundances are derived from HubbleSpace Telescope/Space Telescope Imaging Spectrograph, Keck/High Resolution Echelle Spectrograph, and Very Large Telescope/UV–Visual Echelle Spectrograph spectra and combined with other measurements from the literature to form a more complete picture of nucleosynthesis of the heaviest elements produced in the r-process… Expand
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Enrichment of Thorium (Th) and Lead (Pb) in the early Galaxy
  • W. Aoki, S. Honda
  • Physics
  • Proceedings of the International Astronomical Union
  • 2009
Abstract We have been determining abundances of Th, Pb and other neutron-capture elements in metal-deficient cool giant stars to constrain the enrichment of heavy elements by the r- and s-processes.… Expand
XV. Third-peak r-process element and actinide abundances in the uranium-rich star CS31082-001
Context. A small fraction of extremely metal-poor (EMP) stars exhibit moderate to extreme excesses of heavy neutron-capture elements produced in the r-process. The production site(s) of these… Expand
THE UBIQUITY OF THE RAPID NEUTRON-CAPTURE PROCESS*
To better characterize the abundance patterns produced by the r-process, we have derived new abundances or upper limits for the heavy elements zinc (Zn, Z= 30), yttrium (Y, Z= 39), lanthanum (La, Z=… Expand
Detection of the Second r-Process Peak Element Tellurium in Metal-Poor Stars
Using near-ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope, we detect neutral tellurium in three metal-poor stars enriched by products… Expand
Relative contributions of the weak, main and fission-recycling r-process
There has been a persistent conundrum in attempts to model the nucleosynthesis of heavy elements by rapid neutron capture (the $r$-process). Although the location of the abundance peaks near nuclear… Expand
Non-LTE effects on the lead and thorium abundance determinations for cool stars
Context. Knowing accurate lead abundances of metal-poor stars provides constraints on the Pb production mechanisms in the early Galaxy. Accurately deriving thorium abundances permits a… Expand
New n-Capture Element Abundance Determinations in an r-Process Enriched Star
We report on new abundance determinations for the neutron-capture elements Cd I (Z=48), Lu II (Z = 71) and Os II (Z = 76) in the r-process enriched star BD + 17 3248. These abundances are derived… Expand
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