Detailed Abundance Distributions for Rare-Earth Elements in the Sun and r-Process-Rich Very Metal-Poor Stars

Details Detailed Abundance Distributions for Rare-Earth Elements in the Sun and r-Process-Rich Very Metal-Poor Stars Detailed Abundance Distributions for Rare-Earth Elements in the Sun and r-Process-Rich Very Metal-Poor Stars

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340706s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #407.06; Bulletin of the American Astronomical Society, Vol. 41, p.203

Astronomy and Astrophysics

Astronomy

Scientific paper

We have derived new abundances of the rare-earth elements Pr, Dy, Tm, Yb, and Lu for the solar photosphere and for five very metal-poor, neutron-capture r-process-rich giant stars. With this study we complete our laboratory-solar-stellar analyses of the rare earth Z=56-72 element domain. Our newly-determined solar photospheric abundances for all rare earths are in excellent agreement with solar-system meteoritic values. We have made detailed comparisons between the rare earth abundances in the neutron-capture-rich low metallicity stars and those in the solar system, specifically comparing the stellar distributions of these very old Galactic stars with the solar r-process only abundances. Such comparisons provide important clues about the nature and types of the earliest Galactic nucleosynthesis and insight into the nature of first generations of Galactic stars.
This work has been supported by the National Science Foundations through grants AST-0506324 to JEL, AST-0607708 to CS, and AST-0707447 to JJC.

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