CN and CH Band Strength Variations in M71 Giants

Details CN and CH Band Strength Variations in M71 Giants CN and CH Band Strength Variations in M71 Giants

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jkas...38...23l&link_type=abstract

Journal of the Korean Astronomical Society, vol. 38, no. 2, pp. 23-31

Statistics

7

Globular Clusters: Individual(M71), Stars: Late-Type, Stars: Population Ii

Scientific paper

CN and CH band strengths for fourteen bright giants in the globular cluster M71 have been measured from archival spectra obtained with the Multiple Mirror Telescope. Adding the collected data from the literature we confirm a bimodality of CN distribution on the red giant branch and the horizontal branch, and CN-CH anti-correlations on the lower giant branch and horizontal branch. However a CN-CH anti-correlation on the upper red giant branch is not quite clear as those of other branches. The small number of statistics could not be excluded as a possible cause. To confirm this, a greater number of sample stars are needed. We also confirm that the ratio of CN-strong to CN-weak stars is quite different from that in 47 Tuc, although the anti-correlation between CN and CH bands, the bimodality of the CN distribution, and the spatial distribution of CN stars in M71 are found to be similar to those in 47 Tuc.

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