SIMBAD references

2002ApJ...580.1149A - Astrophys. J., 580, 1149-1158 (2002/December-1)

A Subaru/High dispersion spectrograph study of lead (Pb) abundances in eight s-process element-rich, metal-poor stars.

AOKI W., RYAN S.G., NORRIS J.E., BEERS T.C., ANDO H. and TSANGARIDES S.

Abstract (from CDS):

We report the abundances of neutron-capture elements in eight carbon-rich, metal-poor (-2.7≤[Fe/H]≤-1.9) stars observed with the Subaru Telescope High Dispersion Spectrograph. The derived abundance patterns indicate that the neutron-capture elements in these objects primarily originated from s-process nucleosynthesis, although the [Ba/Eu] abundance ratios in some objects are lower than that of the solar system s-process component. The present analysis has yielded the Pb abundances for seven objects as well as an upper limit for one object from use of the Pb I λ4057 and λ3683 lines. The values of [Pb/Ba] in these objects cover a wide range, between -0.3 and 1.2. Theoretical studies of s-process nucleosynthesis at low metallicity are required to explain this large dispersion of the [Pb/Ba] values. Variations in radial velocity have been found for two of the eight objects, suggesting that, at least in these instances, the observed excess of s-process elements is due to the transfer of material across a binary system including an AGB star. Comparisons with predictions of AGB nucleosynthesis models are discussed.

Abstract Copyright:

Journal keyword(s): Nuclear Reactions, Nucleosynthesis, Abundances - Stars: Abundances - Stars: AGB and Post-AGB - Stars: Carbon - Stars: Population II

CDS comments: BPS CS 22880-027 is a misprint for CS 22880-074.

Simbad objects: 8

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