Other
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..365b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, March 1984, p. 365-373. Research supported by the Natural Sciences and Engineeri
Other
15
Globular Clusters, Hertzsprung-Russell Diagram, Main Sequence Stars, Stellar Spectrophotometry, Astronomical Catalogs, Color-Magnitude Diagram, Horizontal Branch Stars, Instrument Errors, Southern Sky, Stellar Color, Stellar Magnitude
Scientific paper
A color-magnitude diagram has been obtained for the southern globular cluster NGC 2808, to V(lim) of about 21 (about 2 mag below the main-sequence turnoff). The internal photographic errors are sigma(v) of about 0.02, sigma(b-v) of about 0.03, small enough to permit a precise definition of the turnoff region and an estimate of the 'cosmic scatter' along the main sequence. Fitting of the CMD to VandenBerg's (1983) isochrones shows that an excellent match to the observations is achieved for model parameters of Y about 0.2, Z approximately 0.003, and an age of 16 + or - 2 billion years. All these characteristics are within the expected range from other observational constraints; no new clues from the main-sequence data alone have arisen to help explain the presence of the anomalous blue horizontal-branch stars.
Buonanno Roberto
Corsi Carlo E.
Fusi Pecci Flavio
Harris William E.
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