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2011MNRAS.418..284B - Mon. Not. R. Astron. Soc., 418, 284-319 (2011/November-3)
The s-process in low-metallicity stars – II. Interpretation of high-resolution spectroscopic observations with asymptotic giant branch models.
BISTERZO S., GALLINO R., STRANIERO O., CRISTALLO S. and KAPPELER F.
Abstract (from CDS):
We analyse the light elements C, N, O, Na and Mg, as well as the two s-process indicators, [hs/ls] (where ls = About half of the CEMP-s stars with europium measurements show a high r-process enhancement (CEMP-s/r). The scenario for the origin of CEMP-s/r stars is a debated issue. We propose that the molecular cloud from which the binary system formed was previously enriched in r-process elements, most likely by local SN II pollution. This initial r-enrichment does not affect the s-process nucleosynthesis. However, for a high r-process enrichment ([r/Fe]ini= 2) the r-process contributions to solar La, Nd and Sm (30, 40 and 70 per cent) have to be considered. This increases the maximum [hs/ls] up to ∼ 0.3 dex. CEMP-s/r stars reflect this behaviour, showing higher [hs/ls] than observed in CEMP-s on average. Detailed analyses for individual stars will be provided in Paper III.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: AGB and post-AGB - stars: carbon - stars: Population II
VizieR on-line data: <Available at CDS (J/MNRAS/418/284): table2.dat table3.dat tablea1.dat tablea2.dat refs.dat>
Simbad objects: 115
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