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Color-magnitude photometry for the globular cluster NGC 288
Olszewski, E. W.; Canterna, R.; Harris, W. E.
AA(Washington, University, Seattle, WA; Dominion Astrophysical Observatory, Victoria, British Columbia, Canada), AB(McMaster University, Hamilton, Ontario, Canada)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 1, 1984, p. 158-171. Research supported by the University of Washington, and Natural Sciences and Engineering Research Council. (ApJ Homepage)
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NASA/STI Keywords:
Globular Clusters, Stellar Color, Stellar Magnitude, Stellar Spectrophotometry, Abundance, Astronomical Catalogs, Electrophotometry, Interstellar Extinction, Main Sequence Stars, Red Giant Stars, Stellar Evolution, Stellar Luminosity, Ubv Spectra
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New photographic BV color-magnitude photometry for the globular cluster NGC 288 is described, covering the magnitude range V = 13-21 (from the red-giant tip to about 2 mag below the main-sequence turnoff). The turnoff (bluest point on the observed main sequence) is found to lie at V = 19.1, (B-V) = 0.44, about 0.3 mag fainter than previously estimated by Alcaino and Liller but in close agreement with two other more recent studies. Within the internal scatter of measurement, the present C-M diagram can be successfully matched by VandenBerg isochrones with relatively 'normal' abundance and age parameters (Z = 0.001, Y = 0.2, age = 15 x 10 to the 9th yr).

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