Aluminum Abundances in the Globular Cluster M80: Testing the Role of Deep Mixing in Red Giant Stars

Details Aluminum Abundances in the Globular Cluster M80: Testing the Role of Deep Mixing in Red Giant Stars Aluminum Abundances in the Globular Cluster M80: Testing the Role of Deep Mixing in Red Giant Stars

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..334c&link_type=abstract

NOAO Proposal ID #2001A-0334

Computer Science

Scientific paper

We request two nights on the Blanco 4-m telescope with the Hydra multi-object spectrograph to obtain high resolution spectra of ~100 red giants in the globular cluster M 80 (NGC 6093). The spectra will be used to discover the existence and nature of any deep mixing phenomena in this previously unstudied cluster by looking for variations in the [Al/Fe] and [Na/Fe] ratios as a function of the brightest three magnitudes along the RGB. In addition, we will measure the abundances of the s-process elements, Zr and Ba, to search for evidence of primordial contamination. These data will be compared with the horizontal-branch morphology in order to discover if deep mixing on the RGB can be a second parameter in determining the extended blue tail seen in this cluster.

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