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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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