J/AJ/119/1824ivo://CDS.VizieR/J/AJ/119/1824doi:10.26093/cds/vizier.51191824CDSRey S.-C.Lee Y.-W.Joo J.-M.Walker A.Baird S.2023-04-06T16:50:37Z2000-05-19T15:58:52ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmetallicityglobular-star-clustersphotometryhorizontal-branch-starsWe present new measurements of the metallicity of 131 RR Lyrae stars in the globular cluster {omega} Centauri, using the hk index of the Caby photometric system. The hk method has distinct advantages over {delta}S and other techniques in determining the metallicity of RR Lyrae stars and has allowed us to obtain the most complete and homogeneous metallicity data to date for the RR Lyrae stars in this cluster. For RR Lyrae stars in common with the {delta}S observations of Butler, Dickens, & Epps (1978ApJ...225..148B) and Gratton, Tornambe, & Ortolani (1986A&A...169..111G), we have found that our metallicities, [Fe/H]_hk_, deviate systematically from their {delta}S metallicity, while our [Fe/H]_hk_ for well-observed, field RR_ab_ stars are consistent with previous spectroscopic measurements.2000AJ....119.1824Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/119/1824CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/119/1225 : Stroemgren photometry of Omega Centauri (Hughes+, 2000)J/AJ/108/1350 : Omega Cen FUV photometry (Whitney+, 1994)J/MNRAS/250/314 : CCD photometry of omega Cen (Noble+ 1991)J/A+AS/115/297 : BVRI photometry of Central Field of Omega Cen (Lynga+, 1996)J/PASP/106/828 : BVRI photometry of Omega Cen (Walker 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/119/1824https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/119/1824http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/119/1824https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/119/1824https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/119/1824http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/119/1824GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/119/1824/table4Caby photometry of {omega} Cen RR Lyrae starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNumberVariable star numberintprimary(b-y)1The dereddened (b-y) color from observation 1magfloate_(b-y)1Uncertainty in (b-y)1magfloathk1The dereddened hk index from observation 1magfloate_hk1Uncertainty in hk1magfloat(b-y)2? The dereddened (b-y) color from observation 2magfloatnullablee_(b-y)2? Uncertainty in (b-y)2magfloatnullablehk2? The dereddened hk index from observation 2magfloatnullablee_hk2? Uncertainty in hk2magfloatnullable(b-y)3? The dereddened (b-y) color from observation 3magfloatnullablee_(b-y)3? Uncertainty in (b-y)3magfloatnullablehk3? The dereddened hk index from observation 3magfloatnullablee_hk3? Uncertainty in hk3magfloatnullable(b-y)4? The dereddened (b-y) color from observation 4magfloatnullablee_(b-y)4? Uncertainty in (b-y)4magfloatnullablehk4? The dereddened hk index from observation 4magfloatnullablee_hk4? Uncertainty in hk4magfloatnullableJ/AJ/119/1824/table5Metallicities and photometric parameters for {omega} Cen RR Lyrae starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNumberVariable star numberintprimaryTypeRR Lyrae typechar[Fe/H]The final mean weighted iron to hydrogen abundance (relative to solar) derived from the hk indexlog(Sun)floate_[Fe/H]? Uncertainty in [Fe/H]log(Sun)floatnullableObsNumber of independent measurements used to obtain [Fe/H]int[Fe/H]S? The [Fe/H] abundance derived from the {delta}S method (1)log(Sun)floatnullableVmag? Intensity mean V band magnitude (2)magfloatnullablePeriod? The RR Lyrae period (2)dfloatnullableAmp? Amplitude of star in the B band (3)magfloatnullable