The Metallicity Distribution Function of Omega Centauri

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dc.creatorFrinchaboy, Peter M.
dc.creatorRhee, Jaehyon
dc.creatorOstheimer, James C.
dc.creatorMajewski, Steven R.
dc.creatorPatterson, Richard J.
dc.creatorJohnson, Winfrey Y.
dc.creatorDinescu, Dana
dc.creatorPalma, Christopher
dc.creatorWestfall, Kyle B.
dc.creatorKunkel, William B.
dc.date2001-12-07
dc.date2001-12-07
dc.date.accessioned2026-07-07T02:01:44Z
dc.date.available2026-07-07T02:01:44Z
dc.descriptionWe 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.
dc.description8 pages with 6 PS figs, newpasp.sty, to be published in the "Omega Centauri: a Unique Window into Astrophysics" (Cambridge, Aug. 2001), ASP Conf. Ser. edited by F. van Leeuwen, G. Piotto,and J. Hughes
dc.identifierhttps://arxiv.org/abs/astro-ph/0112169
dc.identifierhttp://arxiv.org/abs/astro-ph/0112169
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/3862
dc.subjectAstrophysics
dc.titleThe Metallicity Distribution Function of Omega Centauri
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