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Paper: Surprising Metallicity of a Newly Discovered M79 Post-AGB Star
Volume: 432, New Horizons in Astronomy: Frank N. Bash Symposium 2009
Page: 254
Authors: Şahin, T.; Lambert, D. L.
Abstract: A detailed chemical composition analysis based on a high-resolution (R ≃ 35, 000) CCD spectrum is presented for a newly discovered post-AGB star in the globular cluster M79 for the first time. The elemental abundance results of M79 post- AGB star are found to be [C/Fe] ≃ −0.7, [O/Fe] = +1.4, [α−process/Fe] ≃ 0.5, and [s−process/Fe] ≃ −0.1. The surprising result is that the iron abundance of the star is apparently about 0.6 dex less than that of the cluster’s red giants as reported by published studies including a recent high-resolution spectroscopic analysis by Carretta and colleagues.
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