J/MNRAS/427/1153ivo://CDS.VizieR/J/MNRAS/427/1153doi:10.26093/cds/vizier.74271153CDSSimpson J.D.Cottrell P.L.Worley C.C.2024-07-19T20:17:01Z2013-03-22T12:21:33ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starschemical-abundancesinfrared-photometryvisible-astronomybroad-band-photometryWe have determined stellar parameters and abundances for 221 giant branch stars in the globular cluster omega Centauri. A combination of photometry and lower-resolution spectroscopy was used to determine temperature, gravity, metallicity, [C/Fe], [N/Fe] and [Ba/Fe]. These abundances agree well with those found by previous researchers and expand the analysed sample of the cluster. k-means clustering analysis was used to group the stars into four homogeneous groups based upon these abundances. These stars show the expected anticorrelation in [C/Fe] to [N/Fe]. We investigated the distribution of CN-weak/strong stars on the colour-magnitude diagram. Asymptotic giant branch stars, which were selected from their position on the colour-magnitude diagram, were almost all CN-weak. This is in contrast to the red giant branch where a large minority were CN-strong. The results were also compared with cluster formation and evolution models. Overall, this study shows that statistically significant elemental and evolutionary conclusions can be obtained from lower resolution spectroscopy.2012MNRAS.427.1153Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/427/1153CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/360/472 : Proper motions in omega Centauri (van Leeuwen+, 2000)J/MNRAS/382/1353 : Spectral atlas of omega Cen post-MS stars (Van Loon+, 2007)J/A+A/493/959 : UBV(RI)cHalpha photometry in omega Cen (Bellini+, 2009)J/ApJ/722/1373 : {omega} Centauri giants abundances (Johnson+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/427/1153https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/427/1153http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/427/1153https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/427/1153https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/427/1153http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/427/1153GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/427/1153/stars (Photometry, number of spectra, Teff, logg and abundances for the stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/427/1153/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/427/1153/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/427/1153/stars?GETtext/xml+votable180.050000true201.7434583-47.27263890.0055555555555555566/43225 432271.5062136169708525e-19 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/427/1153?format=asciiOpticalInfrareddefaultJ/MNRAS/427/1153/starsPhotometry, number of spectra, Teff, logg and abundances for the starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLEIDStar identification number (G1)meta.id;meta.mainintUmag? U band photometry (1)magphot.mag;em.opt.UfloatnullableVmag? V band photometry (1)magphot.mag;em.opt.VfloatnullableJmagJ band photometry (2MASS)magphot.mag;em.IR.JfloatKmagK band photometry (2MASS)magphot.mag;em.IR.KfloatNspNumber of 2dF spectra in van Loon et al. (2007, Cat. J/MNRAS/382/1353) librarymeta.numberintV07Details (and spectrum) from Van Loon et al. 2007, Cat. J/MNRAS/382/1353meta.ref.urlcharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Metallicitylog(Sun)phys.abund.Zfloat[C/Fe]Abundance [C/Fe]log(Sun)phys.abundfloat[N/Fe]Abundance [N/Fe]log(Sun)phys.abundfloat[O/Fe]Abundance [O/Fe] (2)log(Sun)phys.abundfloat[Na/Fe]Abundance [Na/Fe] (2)log(Sun)phys.abundfloat[Ba/Fe]Abundance [Ba/Fe]log(Sun)phys.abundfloatS(3839)S(3839) spectral index (3)spect.indexfloatCH(4300)CH(4300) spectral index (3)spect.indexfloatGr[1/4] Group classification from k-means analysis (4)meta.idintSimbadSimbad column added by the CDSmeta.refchar_RAPosition from Van Loon et al. 2007, Cat. J/MNRAS/382/1353 (right ascension part)degpos.eq.ra;meta.main_DEPosition from Van Loon et al. 2007, Cat. J/MNRAS/382/1353 (declination part)degpos.eq.dec;meta.main