Other
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apjs...65...83m&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 65, Sept. 1987, p. 83-93. Research supported by the American Astr
Other
7
Astronomical Photometry, Globular Clusters, Brightness Distribution, Color-Magnitude Diagram, Electrophotometry, Giant Stars, Horizontal Branch Stars, Metallicity
Scientific paper
New photographic photometry data for the globular cluster NGC 6723 are presented, and the implications for the CM diagram of the cluster are considered. Revisions to the photometry of Menzies (1974) are suggested which lead to a new value of E(B-V) = 0.10 + or - 0.05 mag. From analysis of the CM diagram and cluster apparent brightness distribution functions, the presence of a gap in the subgiant branch at V = 15.9 is suggested. This implies an uneven rate of evolution along the subgiant branch, similar to gaps seen by other observers for different clusters. Examination of the red end of the right horizontal branch suggests that there may be an extension in the form of an upper horizontal branch. This extension is compared with theoretical models, and agrees with predictions using Y = 0.2-0.3 and Z = 10 to the -4th.
Fraquelli Dorothy A.
Martins Donald H.
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