High-metallicity effects in BVRI colour-magnitude diagrams - The globular cluster NGC 6553

Details High-metallicity effects in BVRI colour-magnitude diagrams - The globular cluster NGC 6553 High-metallicity effects in BVRI colour-magnitude diagrams - The globular cluster NGC 6553

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..362o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 2, Sept. 1990, p. 362-370. Research supported by FAPESP.

Astronomy and Astrophysics

Astrophysics

106

Color-Magnitude Diagram, Globular Clusters, Metallicity, Red Giant Stars, Stellar Spectrophotometry, Charge Coupled Devices, Galactic Bulge, Interstellar Extinction, Late Stars, Stellar Evolution

Scientific paper

BVRI CCD photometry of the glodular cluster NGC 6553 is presented, extending to 21.5 magnitude stars. The color-magnitude diagrams (CMD) of the cluster feature curved giant branches, with the tip of the RGB in some CMDs falling down to the magnitude level of the horizontal branch. This curvature, thought to be a characteristic of SMR clusters, might be useful as a metallicity indicator. By using the magnitude difference between the turn-off and the horizontal branch as the age criterion, the age of NGC 6553 is estimated to be slightly below that of classical globular clusters.

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