Do AGB Stars Differ Chemically from RGB Stars in Globular Clusters?

Details Do AGB Stars Differ Chemically from RGB Stars in Globular Clusters? Do AGB Stars Differ Chemically from RGB Stars in Globular Clusters?

2000-01-03

arxiv.org/abs/astro-ph/0001018v1

Astronomy and Astrophysics

Astrophysics

9 pages, 2 figures (memsait.sty, epsf.sty) to appear in Workshop Proceedings of "The Changes in Abundances in Asymptotic Giant

Scientific paper

Recent improvements in globular cluster colour-magnitude diagrams, coupled with an increase in large-sample spectroscopic abundance studies of cluster giants, finally allow some attempts at a statistically meaningful comparison of the chemical compositions of red giant branch (RGB) and asymptotic branch (AGB) cluster stars. We review some of the extant data here, concluding that in a few clusters the AGB stars show on average smaller amounts of high-temperature proton-capture synthesis products (low oxygen, high sodium and aluminum) at their surfaces than do the first-ascent RGB stars. This suggests that those RGB stars with envelopes that have been enriched with proton-capture material also have high helium contents. Such stars after the He-flash then take up residence on the bluest parts of the horizontal branch (as a consequence of their high envelope helium), probably never to return to the AGB during subsequent evolutionary stages.

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