DDO photometry of giants in NGC 6171 and NGC 6723

Details DDO photometry of giants in NGC 6171 and NGC 6723 DDO photometry of giants in NGC 6171 and NGC 6723

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..838s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Sept. 1986, p. 838-846. Research supported by the N

Astronomy and Astrophysics

Astronomy

17

Globular Clusters, Metallicity, Red Giant Stars, Stellar Composition, Stellar Spectrophotometry, Cn Emission, Horizontal Branch Stars, Stellar Spectra

Scientific paper

DDO photometry is presented for a small sample of red giants in the globular clusters NGC 6171 and NGC 6723. From the location of their giants in the C0(45-48), C0(42-45) diagram, their metallicities are found to be close to (M/H) = 1.1, a result which agrees well with high-dispersion spectroscopic abundance analyses. The similarity of their metallicities, despite their quite different horizontal-branch morphologies, suggests that NGC 6171 and NGC 6723 may provide an inner halo example of the 'second parameter' phenomenon. Several giants with possible 4215 A CN-band enhancements are identified.

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