A detailed chemical composition analysis based on a high-resolution ( R \simeq 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 ] \simeq -0.7 , [ O / Fe ] = +1.4 , [ \alpha - process / Fe ] \simeq 0.5 , and [ s - process / Fe ] \simeq -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 .