BVRI CCD photometry of the globular cluster NGC 3201

Details BVRI CCD photometry of the globular cluster NGC 3201 BVRI CCD photometry of the globular cluster NGC 3201

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216...68a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 68-79.

Astronomy and Astrophysics

Astronomy

27

Astronomical Photometry, Color-Magnitude Diagram, Globular Clusters, Stellar Evolution, Absorption Spectra, Charge Coupled Devices, Horizontal Branch Stars, Metallicity, Sky Surveys (Astronomy)

Scientific paper

Based on 67 CCD images obtained in BVRI with the 1.54-m Danish La Silla telescope, V vs B-V, V vs V-R, V vs V-I, and V vs B-I color-magnitude diagrams of NGC 3201 were constructed. The magnitude difference between the turnoff and the horizontal branch calculated from the four diagrams is found to be 3.44 + or - 0.12, in good agreement with the mean value obtained by Peterson (1986). Matching the color-magnitude diagrams to the BVRI isochrones of Vandenberg and Bell (1985), the diagrams are shown to be best fit using an Fe/H abundance ratio of 1.27 and (m-M)v of 14.00. A cluster age of (16 + or - 3) x 10 to the 9th yr is inferred from the data.

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