Journal Article

Study of isotopic fractions and abundances of the neutron-capture elements in HD 175305

Jiang Zhang, Wenyuan Cui and Bo Zhang

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 2, pages 956-960
Published in print February 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI:
Study of isotopic fractions and abundances of the neutron-capture elements in HD 175305

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The chemical abundances of metal-poor stars are excellent sources of information for setting new constraints on models of Galactic chemical evolution at low metallicities. In this paper we present an attempt to fit the elemental abundances observed in the bright, metal-poor giant HD 175305, and derive isotopic fractions using a parametric model. The observed abundances can be well matched by the combined contributions from s- and r-process material. The component coefficients of the r- and s-processes are C1= 3.220 and C3= 1.134, respectively. The Sm isotopic fraction in this star where the observed neutron-capture elements are produced is predicted to be f152+154= 0.582, which suggests that, even though the r-process is predominantly responsible for the synthesis of the neutron-capture elements in the early Galaxy, the onset of the s-process had already occurred at this metallicity of [Fe/H]=−1.6.

Keywords: nuclear reactions, nucleosynthesis, abundances; stars: abundances

Journal Article.  3704 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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