Europium Isotopic Abundances in Very Metal-poor Stars

Details Europium Isotopic Abundances in Very Metal-poor Stars Europium Isotopic Abundances in Very Metal-poor Stars

2002-01-28

arxiv.org/abs/astro-ph/0201456v1

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures; To appear in ApJ Letters

Scientific paper

10.1086/339471

Europium isotopic abundance fractions are reported for the very metal-poor, neutron-capture-rich giant stars CS 22892-052, HD 115444, and BD +17 3248. The abundance fractions, derived from analysis of several strong Eu II lines appearing in high-resolution spectra of these stars, are in excellent agreement with each other and with their values in the Solar System: fraction(\iso{Eu}{151}) ~= fraction(\iso{Eu}{153}) ~= 0.5. Detailed abundance studies of very metal-poor stars have previously shown that the total elemental abundances of stable atoms with atomic numbers z >= 56 typically match very closely those of a scaled solar-system r-process abundance distribution. The present results for the first time extend this agreement to the isotopic level.

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