Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..136..461a&link_type=abstract
Astronomy and Astrophysics Supplement, v.136, p.461-470
Astronomy and Astrophysics
Astrophysics
7
Globular Clusters: Individual (Ngc 6723)
Scientific paper
We have obtained CCD UBVRI photometry of 3620 stars in the globular cluster NGC 6723, one of the few globular clusters with a horizontal branch well-populated on both sides of the instability strip. This is the first deep five-color study of NGC 6723. We have determined several important parameters for this cluster. Its color excess is E(B-V) =0.11+/-0.01. The most plausible value of metallicity is [Fe/H]=-1.22+/-0.15; even lower values are possible. The apparent distance modulus of the cluster is (m-M)_{V,6723}=14.76. From isochrone analysis, we prefer the NGC 6723 age in the range between 15 and 16 Gyr, in the scale of Bergbusch & VandenBerg (1992). We find a close similarity of the shape and slope of the red giant branch in NGC 6723 and M 3 and of the magnitude difference between the main-sequence turnoff and the horizontal branch in NGC 6723, M 3, and M 5. Based on observations collected at the Las Campanas Observatory, Carnegie Institution of Washington.
Alcaino Gonzalo
Alvarado Franklin
Ipatov Andrei
Liller William
Mironov Aleksej
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