Enhanced production of barium in low-mass stars: evidence from open clusters

Valentina D'Orazi*, Laura Magrini, Sofia Randich, Daniele Galli, Maurizio Busso, Paola Sestito

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

99 Citations (Scopus)


We report the discovery of a trend of increasing barium abundance with decreasing age for a large sample of Galactic open clusters. The observed pattern of [Ba/Fe] versus age can be reproduced with a Galactic chemical evolution model only assuming a higher Ba yield from the s-process in low-mass stars than the average one suggested by parameterized models of neutron-capture nucleosynthesis. We show that this is possible in a scenario where the efficiency of the extra-mixing processes producing the neutron source 13C is anticorrelated with the initial mass, with a larger efficiency for lower masses. This is similar to the known trend of extended mixing episodes acting in H-rich layers and might suggest a common physical mechanism.

Original languageEnglish
Pages (from-to)L31-L34
Number of pages4
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 2009
Externally publishedYes


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