Carbon Isotopes in Globular Clusters Down to the Bump in the Luminosity Function

Details Carbon Isotopes in Globular Clusters Down to the Bump in the Luminosity Function Carbon Isotopes in Globular Clusters Down to the Bump in the Luminosity Function

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...585l..45s&link_type=abstract

The Astrophysical Journal, Volume 585, Issue 1, pp. L45-L48.

Astronomy and Astrophysics

Astronomy

51

Galaxy: Globular Clusters: Individual: Messier Number: M4, Galaxy: Globular Clusters: Individual: Ngc Number: Ngc 6528, Galaxy: Globular Clusters: Individual: Ngc Number: Ngc 6553, Galaxy: Globular Clusters: Individual: Name: 47 Tucanae, Stars: Abundances, Stars: Evolution

Scientific paper

We find that the 12C/13C ratio evolves from high values (>20) below the bump in the luminosity function (BLF) to near the equilibrium value of the CNO cycle above the BLF in the globular clusters (GCs) NGC 6528 and M4. This is the first time that the predicted decline of the 12C/13C ratios due to the extra mixing at the BLF is detected in a GC. In M4, a slight decline from 12C/13C = 10 just above the BLF at MV=+0.5 to 12C/13C = 4 at MV=-0.6 is detected, suggesting that some additional mixing may occur beyond the BLF in this cluster. Isotope ratios are measured and found to be constant in the GCs NGC 6553 and 47 Tucanae down to just above the BLF of those GCs.
Based on observations made in part at the W. M. Keck Observatory by the Gemini staff, supported by the Gemini Observatory, which is operated by the Association of Universities of Research in Astronomy, Inc., on behalf of the international Gemini partnership of Argentina, Australia, Brazil, Canada, Chile, the UK, and the US. The W. M. Keck Observatory is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.

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