English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The production of the elements heavier than iron via slow neutron captures(the s process) is a main feature of the contribution of asymptotic giantbranch (AGB) stars of low mass (< 5 Msun) to the chemistry of the cosmos.However, our understanding of the main neutron source, the 13C(alpha,n)16Oreaction, is still incomplete. It is commonly assumed that in AGB stars mixingbeyond convective borders drives the formation of 13C pockets. However, thereis no agreement on the nature of such mixing and free parameters are present.By means of a parametric model we investigate the impact of different mixingfunctions on the final s-process abundances in low-mass AGB models. Typically,changing the shape of the mixing function or the mass extent of the regionaffected by the mixing produce the same results. Variations in the relativeabundance distribution of the three s-process peaks (Sr, Ba, and Pb) aregenerally within +/-0.2 dex, similar to the observational error bars. Weconclude that other stellar uncertainties - the effect of rotation and ofovershoot into the C-O core - play a more important role than the details ofthe mixing function. The exception is at low metallicity, where the Pbabundance is significantly affected. In relation to the composition observed instardust SiC grains from AGB stars, the models are relatively close to the dataonly when assuming the most extreme variation in the mixing profile.

Partial mixing and the formation of 13C pockets in AGB stars: effects on the s-process elements