Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012pasp..124..304l&link_type=abstract
Publications of the Astronomical Society of the Pacific, Volume 124, issue 914, pp.304-315
Astronomy and Astrophysics
Astronomy
Stars
Scientific paper
The chemical abundances of the + stars can give us excellent information for setting constraints on models of - and -process nucleosynthesis. In this article, we fit the element abundances of 32 + or -rich stars by using a parametric model. We find that the -process abundance pattern related to + stars is similar to the pattern of -rich stars. On the other hand, the abundance pattern of light elements and iron group elements for the + stars is very close to the pattern for weak -process stars. The + stars and -rich stars are initially formed in the molecular cloud, which had been polluted by weak -process material. The yields of -process related to + stars are proportional to their metallicity. Although the origin and site of the -process are quite different from those of the -process, there is a strong correlation between the enhancement level of the -process and -process in + stars. This implies that -process matter accreted from the origin of the -process, such as AIC or SN 1.5, has an increasing trend with increasing -process matter accreted from the AGB stars.
Cui Wen-Yuan
Li Hongjie
Liang Shuai
Shen Xiaojing
Zhang Bo
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