2014A&A...566A..16C -
Astronomy and Astrophysics, volume 566A, 16-16 (2014/6-1)
Possible discovery of the r-process characteristics in the abundances of metal-rich barium stars.
CUI W.Y., ZHANG B., SHI J.R., ZHAO G., WANG W.J. and NIU P.
Abstract (from CDS):
We study the abundance distributions of a sample of metal-rich barium stars provided by Pereira et al. (
2011A&A...533A..51P) to investigate the s- and r-process nucleosynthesis in the metal-rich environment. We compared the theoretical results predicted by a parametric model with the observed abundances of the metal-rich barium stars. We found that six barium stars have a significant r-process characteristic, and we divided the barium stars into two groups: r-rich barium stars (C
r>5.0, [La/Nd]<0) and normal barium stars. The behavior of the r-rich barium stars seems more like that of the metal-poor r-rich and CEMP-r/s stars. We suggest that the most possible formation mechanism for these stars is the s-process pollution, although their abundance patterns can be fitted very well when the pre-enrichment hypothesis is included. That we cannot explain them well using the s-process nucleosynthesis alone may be due to our incomplete knowledge on the production of Nd, Eu, and other relevant elements by the s-process in metal-rich and super metal-rich environments (see details in Pereira et al.,
2011A&A...533A..51P).
Abstract Copyright:
∼
Journal keyword(s):
stars: abundances - stars: chemically peculiar - stars: AGB and post-AGB - binaries: general
Simbad objects:
17
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2014A&A...566A..16C and select 'bookmark this link' or equivalent in the popup menu