NEW RARE EARTH ELEMENT ABUNDANCE DISTRIBUTIONS FOR THE SUN AND FIVE r-PROCESS-RICH VERY METAL-POOR STARS

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...

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Published inThe Astrophysical journal. Supplement series Vol. 182; no. 1
Main Authors Sneden, Christopher, Lawler, James E., Den Hartog, Elizabeth A., Cowan, John J., Ivans, Inese I.
Format Journal Article
LanguageEnglish
Published United States 15.05.2009
Subjects
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BARIUM
CAPTURE
DYSPROSIUM
ELEMENT ABUNDANCE
GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
GIANT STARS
HAFNIUM
LUTETIUM
NEUTRON REACTIONS
PHOTOSPHERE
PRASEODYMIUM
R PROCESS
SUN
THULIUM
YTTERBIUM
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Summary: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.
ISSN:0067-0049
1538-4365
DOI:10.1088/0067-0049/182/1/80;COUNTRYOFINPUT:INTERNATIONALATOMICENERGYAGENCY(IAEA)