Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.1643b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Nov. 1989, p. 1643-1647. Research supported by the Kennilworth Fund of the New Y
Astronomy and Astrophysics
Astronomy
65
Carbon Isotopes, Charge Coupled Devices, Globular Clusters, Red Giant Stars, Stellar Spectra, High Resolution, Stellar Evolution, Stellar Mass, Stellar Models
Scientific paper
Carbon isotope ratios for stars in four globular clusters are derived by means of spectrum synthesis analysis of CN features in high-resolution spectra around 8000 A. In the strong-CN stars in the clusters M4, M22, Omega Cen, and 47 Tuc, the isotope ratios are generally quite low, approaching the equilibrium value in the CN cycle, namely 3-8; this includes a barium star and an S star in Omega Cen and a CH star in M22. (C-13)N is not detected in weak-CN stars, but the limits on the (C-12)/(C-13) ratios in these stars are not significant. Ratios as low as 3-8 are not predicted by standard evolution models of low-mass metal-poor stars.
Brown Jeffery A.
Wallerstein George
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