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- W2018704013 abstract "A program of observations of CO absorption strength in giant stars in globular clusters has been carried out for stars in M3, M5, M10, M13, M71, NGC6171, and M92. The expected correlation of CO strength with overall metal abundance is present: The metal-rich cluster M71 shows CO absorption similar to that of Population I field giants, while the weakest CO indices are found in the more metal-deficient clusters. Among the intermediate-metallicity clusters, however, the CO index correlates with horizontal-branch morphology and not with metal abundance (Fe/H). The globular clusters M3 and M5, which have well-developed red horizontal branches, show measurably stronger CO absorption than do the clusters M13 and M10, which have blue horizontal branches. The relative abundance (CNO/Fe) may be a significant factor in determining the distribution of stars on the horizontal branch." @default.
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- W2018704013 date "1978-09-01" @default.
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- W2018704013 title "Observations of CO in globular cluster stars" @default.
- W2018704013 doi "https://doi.org/10.1086/156388" @default.
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