Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..845p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, June 15, 1986, p. 845-867.
Astronomy and Astrophysics
Astronomy
110
Charge Coupled Devices, Globular Clusters, Stellar Spectrophotometry, Astrometry, Color-Magnitude Diagram, Main Sequence Stars, Metallicity, Stellar Evolution, Subdwarf Stars
Scientific paper
A V, B-V color-magnitude diagram for the globular cluster NGC 6752 is presented. The use of a CCD has resulted in a color-magnitude diagram with a very well defined sequence going fainter than previously published work, and showing small scatter and little contamination. The distance to the cluster has been accurately tied to the trigonometrical parallaxes of local subdwarfs, giving a true distance modulus of 13.17 + or - 0.17 mag. The absolute magnitude of the horizontal branch, taken at the hypothetical center of the instability strip, is found to be M(V) = +0.39 + or - 0.19. The age and metallicity of the cluster have been found from matching to the theoretical isochrones of VandenBerg and Bell (1985). An age of 16 + or - 1 Gyr and a metallicity of Fe/H = -1.5 + or - 0.2 are derived, and the age spread of stars in the cluster must be less than 0.5 Gyr. The observed lower main sequence has a shallower slope than the theoretical isochrones. The spread in metallicity among the stars in the cluster is limited to + or - 0.15 dex by the small scatter on the subgiant branch. The luminosity function of the lower main sequence is similar to that of local population I stars. No cluster white dwarfs are found.
Dickens R. J.
Penny Alan J.
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