BVRI CCD photometry of Omega Centauri

Details BVRI CCD photometry of Omega Centauri BVRI CCD photometry of Omega Centauri

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1585a&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Dec. 1987, p. 1585-1599.

Astronomy and Astrophysics

Astronomy

43

Charge Coupled Devices, Color-Magnitude Diagram, Globular Clusters, Stellar Evolution, Stellar Spectrophotometry, Ubv Spectra, Astronomical Catalogs, Horizontal Branch Stars, Main Sequence Stars

Scientific paper

The authors present the first CCD, BVRI main-sequence photometry for ω Cen, matched to the new BVRI isochrones of VandenBerg and Bell (1985). Their main conclusions are: (1) The main-sequence turnoffs as seen in the several colors are found to be at VTO = 18.3±0.15; the MSTO color indexes are at: B-V = 0.55±0.03, V-I = 0.73±0.03, and B-I = 1.28±0.03. (2) The magnitude difference between the main-sequence turnoff and the horizontal branch is ΔMV = 3.80±0.15, as derived from the color-magnitude diagrams. (3) The authors deduce a consistent age for ω Cen in all three color-magnitude diagrams of 17±1.5 Gyr. (4) The large scatter among the main-sequence stars demonstrates that the chemical inhomogeneity of about |Fe/H| = ≡1 dex persists as well in the unevolved stars, hence suggesting the composition to be primordial.

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