Updated stellar yields from asymptotic giant branch models

A. I. Karakas*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    600 Citations (Scopus)

    Abstract

    An updated grid of stellar yields for low- to intermediate-mass thermally pulsing asymptotic giant branch (AGB) stars is presented. The models cover a range in metallicity Z= 0.02, 0.008, 0.004 and 0.0001, and masses between 1 and 6 M. New intermediate-mass (M ≥ 3 M) Z= 0.0001 AGB models are also presented, along with a finer mass grid than used in previous studies. The yields are computed using an updated reaction rate network that includes the latest NeNa and MgAl proton capture rates, with the main result that between ∼6 and 30 times less Na is produced by intermediate-mass models with hot bottom burning. In low-mass AGB models, we investigate the effect, on the production of light elements, of including some partial mixing of protons into the intershell region during the deepest extent of each third dredge-up episode. The protons are captured by the abundant 12C to form a 13C pocket. The 13C pocket increases the yields of 19F, 23Na, the neutron-rich Mg and Si isotopes, 60Fe and 31P. The increase in 31P is by factors of ∼4 to 20, depending on the metallicity. Any structural changes caused by the addition of the 13C pocket into the He intershell are ignored. However, the models considered are of low mass and any such feedback is likely to be small. Further study is required to test the accuracy of the yields from the partial-mixing models. For each mass and metallicity, the yields are presented in a tabular form suitable for use in galactic chemical evolution studies or for comparison to the composition of planetary nebulae.

    Original languageEnglish
    Pages (from-to)1413-1425
    Number of pages13
    JournalMonthly Notices of the Royal Astronomical Society
    Volume403
    Issue number3
    DOIs
    Publication statusPublished - Apr 2010

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