The giant, asymptotic and horizontal branches of globular clusters. III - Photographic photometry of NGC 6752

Details The giant, asymptotic and horizontal branches of globular clusters. III - Photographic photometry of NGC 6752 The giant, asymptotic and horizontal branches of globular clusters. III - Photographic photometry of NGC 6752

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26as...66...79b&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 66, no. 1, Oct. 1986, p. 79-109. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

89

Astronomical Photography, Globular Clusters, Horizontal Branch Stars, Red Giant Stars, Stellar Evolution, Stellar Spectrophotometry, Astrometry, Helium, Hertzsprung-Russell Diagram, Image Reconstruction, Spatial Distribution

Scientific paper

More than 5000 stars were measured in the globular cluster NGC 6752 by photographic photometry with a stellar image reconstruction method. The large complete sample obtained allows a statistically significant analysis of the C-M diagram and of the space distribution. The gap previously noticed in the HB appears as a zone of scarce population between two main regions of occupation. The hottest and faintest HB members show a noticeably wider space distribution than other cluster members. The observed red giant luminosity function is found to be in substantial agreement with theoretical predictions. The horizontal branch luminosity level, the R-method and the shape of the luminosity function in the subgiant region all converge to indicate a value of Y = 0.23+/-0.03. A stringent lower limit of 13 billion years is deduced for the cluster age.

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