LTE Strontium and Barium in Metal-Poor Red Giants

Details LTE Strontium and Barium in Metal-Poor Red Giants LTE Strontium and Barium in Metal-Poor Red Giants

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99r.144s&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.144

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Scientific paper

We present atmospheric models of red-giant stars of various metallicities, including extremely metal-poor (XMP, [Fe/H] = -4) models, with many chemical species, including, significantly, the first two ionization stages of Strontium (Sr) and Barium (Ba), treated in non-local thermodynamic equilibrium (NLTE). The abundances of Sr and Ba are significant because they indicate the relative importance of the nucleosynthesis of light and heavy neutron-capture elements in the chemical evolution of the galaxy. Initial results indicate that for some lines with abundant diagnostics, the predicted line strength and, hence, the inferred abundance, is dependent on two aspects of the modelling: 1) whether Sr and Ba themselves are treated in LTE or NLTE, and 2) whether many other chemical species are also treated in LTE or NLTE. This study underscores the importance of using physically realistic atmospheric models to infer the chemical evolution of the galaxy from stellar spectra.

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