BVRI CCD photometry of the metal-poor globular cluster NGC 4372

Details BVRI CCD photometry of the metal-poor globular cluster NGC 4372 BVRI CCD photometry of the metal-poor globular cluster NGC 4372

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..159a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, July 1991, p. 159-176, 438-442.

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19

Astronomical Photometry, Globular Clusters, Metallicity, Color-Magnitude Diagram, Main Sequence Stars

Scientific paper

BVRI CCD photometry is presented in two overlapping fields in the metal-poor globular cluster NGC 4372. The observations extend approximately 2 mag below the main-sequence turnoff to V about 21. By comparing the color-magnitude diagram (CMD) with those of clusters with similar metallicities, it is found that E(B-V) = 0.50 + or - 0.03, and (m-M)v = 14.75 + or - 0.06. Comparison with theoretical isochrones leads to a value E(B-V) = 0.53 + or - 0.03. Comparison of the CMD with that of bright stars published by other authors yields a value for Delta V(TO-HB) = 3.3 + or - 0.3. The weighted mean value of the age of the cluster, derived from the four colors, is 15 + or - 4 Gyr (estimated external uncertainty).

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