CCD Photometry of the Galactic globular cluster NGC 6535 in the B and V Passbands

Details CCD Photometry of the Galactic globular cluster NGC 6535 in the B and V Passbands CCD Photometry of the Galactic globular cluster NGC 6535 in the B and V Passbands

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..404s&link_type=abstract

Publications of the Astronomical Society of the Pacific, vol. 106, no. 698, p. 404-412

Astronomy and Astrophysics

Astronomy

18

Astronomical Photometry, Color-Magnitude Diagram, Globular Clusters, Horizontal Branch Stars, Charge Coupled Devices, Chronology, Metallicity, Morphology

Scientific paper

The first CCD color-magnitude diagram (CMD) in B and V is presented for the Galactic globular cluster NGC 6535. From this CMD, which extends below the main-sequence turnoff, we draw the following conclusions: (1) The horizontal branch (HB) is predominantly blue in nature with no RR Lyrae variables known to be cluster members. Nonetheless, based on a comparison with clusters which have blue HBs and RR Lyraes (M15 and M79), we infer a mean HB magnitude of (VRR) = 15.73 plus or minus 0.11 for NGC 6535. (2) Again, via a direct comparison with the blue HBs of M15 and M79, we derive a cluster reddening of E(B - V) = 0.44 plus or minus 0.02. (3) When combined with the apparent color of the red-giant branch at the level of the HB, (B-V)g = 1.18 plus or minus 0.02, the derived reddening yields a metal abundance of (Fe/H) = -1.85 plus or minus 0.10, similar to that of NGC 6397. (4) Application of the Delta VTO-HB and Delta (B-V)SGB-TO cluster dating techniques reveals no perceptible age difference between NGC 6535 and NGC 6397. (5) A significant population of nine blue-straggler candidates is detected in NGC 6535. However, this is too few to facilitate a meaningful analysis of their radial distribution.

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