Anticorrelated CN and CH variations on the 47 Tucanae main-sequence turnoff

@article{Briley1994AnticorrelatedCA,
  title={Anticorrelated CN and CH variations on the 47 Tucanae main-sequence turnoff},
  author={Michael M. Briley and James E. Hesser and Roger A. Bell and Michael J. Bolte and G. H. Smith},
  journal={The Astronomical Journal},
  year={1994},
  volume={108},
  pages={2183}
}
Observations of CN and CH band strengths among a random sample of main-sequence turn-off stars (+3.9 < MV < +4.6) in the globular cluster 47 Tuc (NGC 104, C0021-723) were made with the CTIO Argus fiber spectrograph for the purpose of determining the ratio of CN-strong to CN-weak stars and investigating the behavior of CH relative to CN. Of the 20 turn-off stars, 12 were found to be CN-strong while 8 appear to be CN-weak. This ratio of CN-strong to CN-weak stars is similar to the ratios found… 
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