Washington CCD photometry of the disk globular clusters NGC 5927 and NGC 6496

Details Washington CCD photometry of the disk globular clusters NGC 5927 and NGC 6496 Washington CCD photometry of the disk globular clusters NGC 5927 and NGC 6496

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1338f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, April 1991, p. 1338-1351.

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20

Astronomical Photometry, Charge Coupled Devices, Globular Clusters, Abundance, Color-Color Diagram, Color-Magnitude Diagram, Metallicity

Scientific paper

Washington CCD photometry has been retained for NGC 5927 and NGC 6496, two globular clusters located within several kiloparsecs of the Galactic center. The data reach almost to the main-sequence turnoffs, showing well-defined giant and subgiant branches, and provide accurate photometry for more than 100 giants in each cluster. Photometry of nearby comparison fields makes it possible to estimate the contribution of field stars to the cluster color-magnitude diagrams. Color indices for the giants are used to determine mean cluster metallicities: Fe/H = - 0.25 + or - 0.25 for NGC 5927 and Fe/H = - 1.05 + or - 0.30 for NGC 6496, where the error estimates include both internal and external photometric errors, as well as uncertainties due to reduction technique. Uncertainties in the reddening to NGC 6496 have a significant impact on the ability to determine the metallicity for this cluster from color indices along. A small increase in the reddening E(B - V) from 0.19 to 0.23 would increase the derived abundance to Fe/H = - 0.8, and bring it into better agreement with other abundance indicators.

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