New Rare Earth Element Abundance Distributions for the Sun and Five R-Process-Rich Very Metal-Poor Stars

Sneden, Christopher
Lawler, James E.
Cowan, John J.
Ivans,, Inese I.
Den Hartog, Elizabeth A.
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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. The photospheric values for all five elements are in good agreement with meteoritic abundances. For the low-metallicity sample, these abundances have been combined with new Ce abundances from a companion paper, and reconsideration of a few other elements in individual stars, to produce internally consistent Ba, rare earth, and Hf ( 56 <= Z <= 72) element distributions. These have been used in a critical comparison between stellar and solar r-process abundance mixes.

Sneden, Christopher, James E. Lawler, John J. Cowan, Inese I. Ivans, and Elizabeth A. Den Hartog. "New rare earth element abundance distributions for the Sun and five r-process-rich very metal-poor stars." The Astrophysical Journal Supplement Series, Vol. 182, No. 1 (May, 2009): 80.