Carbon Isotopes in Metal-Rich Globular Clusters: A Test of Stellar Evolution

Details Carbon Isotopes in Metal-Rich Globular Clusters: A Test of Stellar Evolution Carbon Isotopes in Metal-Rich Globular Clusters: A Test of Stellar Evolution

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop...99s&link_type=abstract

NOAO Proposal ID #1999A-0099

Computer Science

Scientific paper

We propose to follow the evolution of carbon isotopic abundances (^12C and ^13C) down the giant branch in the metal- rich globular clusters via spectroscopy of the first-overtone ^12CO and ^13CO bands at 2.3 (mu). We will be able to reach the absolute magnitudes (M_V ≲ +2.7) at which VandenBerg (1992) predicts a rapid decline in the ratio ^12C/^13C due to the onset of the first dredge-up phase; the absolute magnitude at which this decrease occurs is predicted to be a function of metallicity. Due to poor weather during the initial 3 nights allocated to this project only one cluster, M4 ([Fe/H]=-1.33), was observed. Preliminary analysis of the data indicates that the drop in ^12C/^13C occurs near M_V ~ +0.5. This is the first time a large value of ^12C/^13C has been detected in a globular cluster, and therefore the first time this decline can be associated with evolutionary state. We request three more nights to complete this project.

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