SIMBAD references

2003ApJ...585L..45S - Astrophys. J., 585, L45-L48 (2003/March-1)

Carbon isotopes in globular clusters down to the bump in the luminosity function.

SHETRONE M.D.

Abstract (from CDS):

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.

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Journal keyword(s): 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

CDS comments: Table 1 : Stars in NGC 6528 = Cl* NGC 6528 RGS 6-NNNNN, not in SIMBAD. In 47 Tuc : Cl* NGC 104 LEE NNNN, in M4 : Cl* NGC 6121 LEE NNNN, in NGC 6553 : Cl* NGC 6553 SSR NNNNN

Simbad objects: 30

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