SIMBAD references

2010ApJ...708...51C - Astrophys. J., 708, 51-57 (2010/January-1)

Investigation for the enrichment pattern of the element abundances in r+s star HE 0338-3945: a special r-II star?


Abstract (from CDS):

The very metal-poor star HE 0338-3945 shows a double-enhanced pattern of the neutron-capture elements. The study of this sample could help people gain a better understanding of s- and r-process nucleosynthesis at low metallicity. Using a parametric model, we find that the abundance pattern of the neutron-capture elements could be best explained by a binary system formed in a molecular cloud that had been polluted by r-process material. The observed abundance pattern of C and N can be explained by an asymptotic giant branch (AGB) model. Combined with the parameters obtained from Cui & Zhang, we suggest that the initial mass of the AGB companion is most likely to be about 2.5 M, which excludes the possibility of forming a Type 1.5 supernova. By comparing with the observational abundance pattern of CS 22892-052, we find that the dominant production of O should accompany the production of the heavy r-process elements of r+s stars. Similar to r-II stars, the heavy r-process elements are not produced in conjunction with all the light elements from the Na to Fe group. The abundance pattern of the light and r-process elements for HE 0338-3945 is very close to the pattern of the r-II star CS 22892 - 052. Therefore, we suggest that HE 0338-3945 should be a special r-II star.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: chemically peculiar

Simbad objects: 3

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