CCD and photographic photometry of NGC 1904

Details CCD and photographic photometry of NGC 1904 CCD and photographic photometry of NGC 1904

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91.1108h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, May 1986, p. 1108-1116.

Astronomy and Astrophysics

Astronomy

16

Astronomical Photography, Charge Coupled Devices, Globular Clusters, Stellar Spectrophotometry, Color-Magnitude Diagram, Main Sequence Stars, Metallicity, Milky Way Galaxy, Subgiant Stars, Ubv Spectra

Scientific paper

Combined CCD and photographic photometry of the globular cluster NGC 1904 are presented. The data reduction procedures for the CCD and digital iris photometry are presented. The cluster's C-M diagram is nearly identical in morphology to that of the nearby globular cluster M13, the only significant difference being the subgiant branch, where the NGC 1904 ridge line is flatter than in M13. If a cluster age of 16 Gyr, as suggested by theoretical models, is adopted, the turnoff and main-sequence region in the C-M diagram are fit by VandenBerg's (1983) isochrone for Y = 0.20 and Z = 0.001 for a distance modulus of 15.65 and a reddening of 0.01. If the cluster is more metal-poor, as suggested by Zinn and West (1984), then an older isochrone is required to match the observations.

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