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

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

2009-01-18

arxiv.org/abs/0901.2743v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages, 2 figures, accepted for publication in ApJL

Scientific paper

10.1088/0004-637X/693/1/L31

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] vs. 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 parametrized 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 $^{13}$C is anti-correlated 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.

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