Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..615n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 615-622.
Astronomy and Astrophysics
Astrophysics
46
Cosmochemistry, Globular Clusters, Red Giant Stars, Stellar Evolution, Correlation, Cyanogen, Methyl Compounds, Stellar Spectra
Scientific paper
CN and G band measurements are presented for 112 stars on the red giant and asymptotic giant branches of 47 Tucanae. The data support the hypothesis (at the 0.00002 significance level) that there is an anticorrelation between CN and CH on the red giant branch (RGB) as has been previously reported for the horizontal-branch stars in this cluster. There seems little need to invoke the occurrence of mixing phenomena during the transition of a star from Mv of about 0.0 on the RGB to the horizontal branch and later evolutionary phases, as has been suggested for the more metal-poor clusters such as M92. The finding of Bell, Hesser, and Cannon (1983) that there appears to be an anticorrelation of CN and CH in their best observed CN-strong, CN-weak pair of stars at the turnoff of this cluster is highlighted. It is emphasized, however, that no primordial scenario has yet been devised which can explain the details of the carbon nitrogen anticorrelation implied by these data.
Da Costa Gary S.
Freeman Ken C.
Norris Jackson
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