Element enhancements along the entire asymptotic giant branch phase

E. C. Wylie-De Boer*, P. L. Cottrell

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)


    The results of a study of the asymptotic giant branch (AGB) phase of stellar evolution are presented. Abundances have been determined for Fe, C, O, the light s-process elements, Y and Zr, the heavy s-process elements, La and Nd, and the r-process element, Eu. The expected relationship between enhanced C, increasing C/O ratio, and enhanced s-process elements has been quantified. Results are presented to provide observational data with which to compare theoretical predictions. The results in this paper confirm previously suggested relationships between C, C/O, and s-process element enhancements. It is seen that AGB stars show C/O ratios from C/O ∼ 0.4 to 1.0, while C enhancements lie between [C/Fe] = 0.1-0.9 dex. Enhancements of s-process elements are as much as [s/Fe] ∼ 1.0 dex for the stars in which C is also greatly enhanced.

    Original languageEnglish
    Pages (from-to)522-530
    Number of pages9
    JournalAstrophysical Journal
    Issue number1
    Publication statusPublished - 10 Feb 2009


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