NGC 6535 BV CCD photometry (Sarajedini, 1994)

Details NGC 6535 BV CCD photometry (Sarajedini, 1994) NGC 6535 BV CCD photometry (Sarajedini, 1994)

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ycat..61060404s&link_type=abstract

VizieR On-line Data Catalog: J/PASP/106/404. Originally published in: 1994PASP..106..404S

Computer Science

Clusters: Globular, Photometry: Ccd

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 =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 nine blue-straggler candidates is detected in NGC 6535. However, this is too few to facilitate a meaningful analysis of their radial distribution. (1 data file).

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