Subtle differences in the CN and CH bands of two M55 red giants

Details Subtle differences in the CN and CH bands of two M55 red giants Subtle differences in the CN and CH bands of two M55 red giants

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..635s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Sept. 1983, p. 635-638.

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6

Globular Clusters, Red Giant Stars, Spectral Bands, Stellar Spectra, Abundance, Cyanogen, Hydrocarbons, Wavelengths

Scientific paper

Spectra of 0.5 A resolution are presented for two red giants within the globular cluster M55. Whereas a previous lower resolution survey showed little evidence for a range in lambda 3883 cyanogen band strengths, the new data show that small but measurable CN and CH variations exist within this cluster. The two giants exhibit a positive correlation between CN and CH, in contrast to the results obtained in clusters such as NGC 6752. In this respect, and others, M55 is more like M22 and omicron Cen.

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