Akademik Veri Yönetim Sistemi
Lambert D. L.(Yürütücü), Şahin T.
Diğer Uluslararası Fon Programları, 2008 - 2011
An abundance analysis based on a high-resolution spectrum is presented
for a newly discovered post-asymptotic giant branch (PAGB) star in the
globular cluster M79. 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.
Abundances relative to iron appear to be the same for the PAGB star and
the red giants for the 15 common elements. It is suggested that the
explanation for the lower abundances of the PAGB star may be that its
atmospheric structure differs from that of a classical atmosphere; the
temperature gradient may be flatter than predicted by a classical
atmosphere.