Europium Isotopic Abundances in Very Metal Poor Stars | Zendy

C. Sneden | Zendy; J. J. Cowan | Zendy; J. E. Lawler | Zendy; Scott Burles | Zendy; Timothy C. Beers | Zendy; George M. Fuller | Zendy

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Europium Isotopic Abundances in Very Metal Poor Stars

Author(s) -

C. Sneden,

J. J. Cowan,

J. E. Lawler,

Scott Burles,

Timothy C. Beers,

George M. Fuller

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/339471

Subject(s) - europium , abundance (ecology) , natural abundance , stars , giant star , isotope , astrophysics , metal , physics , spectral line , atomic number , chemistry , astronomy , nuclear physics , ion , biology , organic chemistry , fishery , quantum mechanics

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. Theabundance fractions, derived from analysis of several strong Eu II linesappearing in high-resolution spectra of these stars, are in excellent agreementwith each other and with their values in the Solar System:fraction(\iso{Eu}{151}) ~= fraction(\iso{Eu}{153}) ~= 0.5. Detailed abundancestudies of very metal-poor stars have previously shown that the total elementalabundances of stable atoms with atomic numbers z >= 56 typically match veryclosely those of a scaled solar-system r-process abundance distribution. Thepresent results for the first time extend this agreement to the isotopic level.Comment: 13 pages, 3 figures; To appear in ApJ Letter

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