J/AJ/150/176ivo://CDS.VizieR/J/AJ/150/176doi:10.26093/cds/vizier.51500176CDSCohen R.E.Hempel M.Mauro F.Geisler D.Alonso-Garcia J.Kinemuchi K.2017-12-12T14:44:49Z2016-04-20T16:09:45ZCDS support team

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

cds-question@unistra.frglobular-star-clustersinfrared-photometryWe present wide field near-infrared (near-IR) photometry of 12 Galactic globular clusters, typically extending from the tip of the cluster red giant branch (RGB) to the main sequence turnoff. Using recent homogenous values of cluster distance, reddening and metallicity, the resulting photometry is directly compared to the predictions of several recent libraries of stellar evolutionary models. Of the sets of models investigated, Dartmouth and Victoria-Regina models best reproduce the observed RGB morphology, albeit with offsets in J-K_S_ color which vary in their significance in light of all sources of observational uncertainty. Therefore, we also present newly recalibrated relations between near-IR photometric indices describing the upper RGB versus cluster iron abundance as well as global metallicity. The influence of enhancements in alpha elements and helium are analyzed, and we find that the former affect the morphology of the upper RGB in accord with model predictions. Meanwhile, the empirical relations we derive are in good agreement with previous results, and minor discrepancies can likely be attributed to differences in the assumed cluster distances and reddenings. In addition, we present measurements of the horizontal branch (HB) and RGB bump magnitudes, finding a non-negligible dependence of the near-IR HB magnitude on cluster metallicity. Lastly, we discuss the influence of assumed cluster distances, reddenings and metallicities on our results, finding that our empirical relations are generally insensitive to these factors to within their uncertainties.2015AJ....150..176Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/150/176CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)VII/202 : Globular Clusters in the Milky Way (Harris, 1997)J/A+A/563/A76 : CaII triplet EWs in 30 globulars (Mauro+, 2014)J/A+A/534/A123 : Horizontal branch stars in NGC 2808 (Gratton+, 2011)J/MNRAS/402/1729 : JHK photometry of 36 GGCs (Valenti+ 2010)J/A+A/505/139 : Abundances of red giants in 17 GCs (Carretta+, 2009)J/A+A/505/117 : Abundances of red giants in 15 GCs (Carretta+, 2009)J/MNRAS/361/272 : JHKs photometry of 4 Bulge GCs (Valenti+, 2005)J/MNRAS/351/1204 : IR Photometry of 10 GGCs (Valenti+, 2004)J/A+A/391/945 : HST photometry of 74 GGCs (Piotto+, 2002)J/A+AS/121/95 : Giant stars abundances in 24 clusters (Carretta+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/150/176https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/150/176http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/150/176https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/150/176https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/150/176http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/150/176GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/150/176/table4 (Cluster parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/176/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/176/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/176/table4?GETtext/xml+votable180.050000true6.0237917-72.08130560.005555555555555556Cone search capability for table J/AJ/150/176/table3 (Clusters photometric catalog)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/150/176/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/150/176/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/150/176/table3?GETtext/xml+votable180.050000true6.28372694-72.069278890.0055555555555555566/16647 16658 29184 33321 33330 33634 33635 34242 34243 37294 37636 41522 41852 42320 47278 47620 48434 484408.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/150/176?format=asciiInfrareddefaultJ/AJ/150/176/table4Cluster parametersNGCNGC number of clustermeta.id;meta.mainintprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.main(m-M)0Cluster distance modulus (2)magphot.mag.distModfloatE(B-V)Reddening (2)magphot.color.excessfloat[Fe/H]Metallicity from Carretta et al. (2009A&A...508..695C)log(Sun)phys.abund.Zfloate_[Fe/H]Error in [Fe/H]log(Sun)stat.error;phys.abund.Fefloat[a/Fe]1? Observed [{alpha}/Fe] abundance (3)log(Sun)phys.abundfloatnullable[a/Fe]2Assumed [{alpha}/Fe] abundance (4)log(Sun)phys.abundfloate_[a/Fe]2Error in [a/Fe]2log(Sun)stat.error;phys.abundfloat[M/H]Global metallicity (5)log(Sun)phys.abund.Zfloate_[M/H]Error in [M/H]log(Sun)stat.error;phys.abundfloatV-IThe {Delta}(V-I) index (2)magphot.color;em.opt.V;em.opt.Ifloate_V-IError in V-Imagstat.error;phot.color;em.opt.VfloatSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlcharJ/AJ/150/176/table3Clusters photometric catalogrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCNGC number of clustermeta.id;meta.mainintprimaryRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainindexedJmagThe J band magnitude in 2MASS photometric systemmagphot.mag;em.IR.Jfloate_JmagThe 1{sigma} uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatKsmagThe Ks band magnitude in 2MASS photometric systemmagphot.mag;em.IR.Kfloate_KsmagThe 1{sigma} uncertainty in Ksmagmagstat.error;phot.mag;em.IR.Kfloat