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The metal-rich globular cluster NGC 6528

1979; Institute of Physics; Volume: 84; Linguagem: Inglês

10.1086/112542

1538-3881

S. van den Bergh, F. Younger,

Stellar, planetary, and galactic studies

Results are reported for photoelectric and photographic photometry of the metal-rich globular cluster NGC 6528. The cluster color-magnitude diagram is discussed, along with the cluster reddening and giant branch. A B-V color excess of 0.52 + or - 0.07 is adopted, and a true distance modulus of 13.93 is determined, which corresponds to R = 6.1 kpc and Z = -0.4 kpc. The position is within the 'central superdisk' of the Galaxy and is shown to be consistent with the high cluster metallicity indicated by Morgan's (1959) metallic line-strength classification as well as by the overall morphology of the cluster color-magnitude diagram.