Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-12-07
Astronomy and Astrophysics
Astrophysics
8 pages with 6 PS figs, newpasp.sty, to be published in the "Omega Centauri: a Unique Window into Astrophysics" (Cambridge, Au
Scientific paper
We explore the metallicity distribution function (MDF) of red giant stars in Omega Centauri from a catalogue of Washington M, T_2 and DDO51 photometry covering over 1.1 deg^2 outside the cluster core. Using updated calibrations of giant branch isometallicity loci in this filter system, photometric metallicities, guided by previously published spectroscopic abundances, are derived. Several methods are employed to correct the MDF for contamination by Galactic stars, including: (1) use of the surface gravity sensitivity of the (M-DDO51) color index to eliminate foreground dwarf stars, (2) radial velocities, and (3) membership probabilities from proper motions. The contamination-corrected MDF for Omega Cen shows a range of enrichment levels spanning nearly 2 dex in [Fe/H], and with peaks at [Fe/H]=-1.6, -1.2, and -0.9.
Dinescu Dana
Frinchaboy Peter M.
Johnson Winfrey Y.
Kunkel William B.
Majewski Steven R.
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