Other
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.250..314n&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 250, May 15, 1991, p. 314-339. SERC-supported research.
Other
18
Astronomical Photometry, Color-Magnitude Diagram, Globular Clusters, Main Sequence Stars, Milky Way Galaxy, Charge Coupled Devices, Metallicity, Stellar Color, Stellar Luminosity
Scientific paper
CCD observations of the galactic globular cluster Omega Centauri are presented and used to construct a color-magnitude diagram extending to V = 24. A distance to the cluster of (m-M)v = 14.29 + or - 0.18 is determined, and it is shown that there exists an intrinsic spread in color, sigma(B-v) = 0.056 + or - 0.016 mag, upon the cluster main sequence. Theoretical isochrones are employed to show that this spread in color is consistent with a main-sequence metallicity distribution similar to that seen in more highly evolved stars within the cluster. The age of the cluster is found to be 16 + or - 3 Gyr, by comparison with theoretical isochrones. The cluster main-sequence luminosity function is constructed, and compared with recent observations of other clusters and theory.
Buttress J.
Dickens R. J.
Griffiths W. K.
Noble R. G.
Penny Alan J.
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