1994PASP..106..404S -
Publ. Astron. Soc. Pac., 106, 404-412 (1994/April-0)
CCD photometry of the galactic globular cluster NGC 6535 in the B and V passbands.
SARAJEDINI A.
Abstract (from CDS):
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 <V_RR> = 15.73 ± 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 ± 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 ± 0.02, the derived reddening yields a metal abundance of [Fe/H] = -1.85 ± 0.10, similar to that of NGC 6397. (4) Application of the delta-V_TO-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 9 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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<Available at CDS (J/PASP/106/404): table2>
Nomenclature:
Table 2: Cl* NGC 6535 SAR NNN (Nos 1-932).
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