Al Abundances in the Globular Cluster NGC 6752: Testing the Role of Deep Mixing in Red Giant Stars

Details Al Abundances in the Globular Cluster NGC 6752: Testing the Role of Deep Mixing in Red Giant Stars Al Abundances in the Globular Cluster NGC 6752: Testing the Role of Deep Mixing in Red Giant Stars

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..393c&link_type=abstract

NOAO Proposal ID #1999A-0393

Physics

Scientific paper

We propose to use the Hydra multi-object echelle spectrometer on the Blanco 4m telescope to obtain high resolution (R ~ 22,000) spectra of Al I lines near (lambda)6700 A of approximately 100 red-giant-branch (RGB) stars in the globular cluster NGC 6752. Our intent is to use the Al abundance as a tracer of deep mixing along the RGB in order to test the hypothesis that He mixing during this phase of evolution can be a ``second parameter'' in determining the horizontal- branch morphology of intermediate metallicity clusters. In addition, we will look for s-process abundances using the (lambda)6142 A Ba II lines to discriminate primordial contamination by a prior generation of asymptotic-giant-branch stars from internal stellar evolution on the RGB. As a final test, we will look for Mg abundance variations through the Mg I (lambda)7387 A line, which might suggest internal processing through part of the MgAl cycle near the hydrogen-burning shell. This would be the largest and deepest test of globular cluster abundance anomalies and would greatly advance our understanding of stellar evolution in a dense cluster environment.

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