SIMBAD references

2009ApJ...693L..31D - Astrophys. J., 693, L31-L34 (2009/March-1)

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

D'ORAZI V., MAGRINI L., RANDICH S., GALLI D., BUSSO M. and SESTITO P.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Galaxy: abundances - Galaxy: disk - Galaxy: evolution - open clusters and associations: general

Simbad objects: 21

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2019.11.17-20:09:10

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