Aluminum Abundances on the Red Giant Branch: Testing Helium Mixing as a Second Parameter

Details Aluminum Abundances on the Red Giant Branch: Testing Helium Mixing as a Second Parameter Aluminum Abundances on the Red Giant Branch: Testing Helium Mixing as a Second Parameter

1998-11-19

arxiv.org/abs/astro-ph/9811321v1

Astrophys.Space Sci. 265 (1999) 191-192

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, to appear in Galaxies: Connecting the Distant Universe with the Local Fossil Record

Scientific paper

10.1023/A:1002155409652

We present new data and discuss the relationship between the Al abundances on the red giant branches (RGBs) and the horizontal-branch (HB) morphologies of the second-parameter pair of globular clusters M3 and M13. Since Al is produced during RGB evolution inside the H-burning shell where He is synthesized, its overabundance in stellar atmospheres can indicate He mixing, which has been shown to be a viable second parameter in explaining HB morpohogies.

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