Deep photometry of globular clusters. IV - Preliminary main sequence photometry of the globular clusters NGC 1904, NGC 2298 and NGC 2808

Astronomy and Astrophysics – Astrophysics

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Charge Coupled Devices, Globular Clusters, Main Sequence Stars, Stellar Spectrophotometry, Data Reduction, Error Analysis, Stellar Evolution

Scientific paper

CCD photometry for the globular clusters NGC 1904 (M79), NGC 2298 and
NGC 2808 is presented. Turn off points are detected in all clusters. A
preliminary comparison with theoretical isochrones shows that the
cluster ages are of the order of 18 Gyr using VandenBerg isochrones.

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