J/AJ/134/229ivo://CDS.VizieR/J/AJ/134/229doi:10.26093/cds/vizier.51340229CDSHughes J.Wallerstein G.Covarrubias R.Hays N.2012-01-23T07:05:12Z2009-11-02T13:50:10ZCDS support team

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

cds-question@unistra.frglobular-star-clustersgiant-starsvisible-astronomybroad-band-photometryWe present Washington photometry of the giant branches of the relatively metal-rich globular cluster NGC 6388 and compare it with 47 Tuc. By examining the spatial distribution of stellar colors across the red giant branch and using spectroscopic data on several bright giants, we found that NGC 6388's center is affected by differential reddening of at least {DELTA}E(B-V)~0.1. Most of the width of the red giant branch is caused by that differential reddening. The southeastern outer regions of the cluster seem to be less affected by variable dust extinction, and we find that NGC 6388 is slightly more metal-rich than 47 Tuc, with a distinct asymptotic giant branch. We have put an upper limit on possible variations in [Fe/H] for NGC 6388, finding that it must be less than ~0.2dex. It is unlikely that such a small range in metallicity could be responsible for the blue horizontal branch and blue tail stars in a cluster with a metallicity similar to the more massive 47 Tuc, which only exhibits a red horizontal branch.2007AJ....134..229Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/134/229CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/134/229https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/134/229http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/134/229https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/134/229https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/134/229http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/134/229GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/134/229/table2 (Original sample of objects in NGC 6388)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/134/229/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/134/229/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/134/229/table2?GETtext/xml+votable180.050000true264.07639028-44.819246110.005555555555555556Cone search capability for table J/AJ/134/229/table3 (Sample of objects in 47 Tuc)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/134/229/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/134/229/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/134/229/table3?GETtext/xml+votable180.050000true6.04653694-72.08593750.0055555555555555566/33321 33323 42314 423362.9196443747461696e-19 3.2860540898823595e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/134/229?format=asciiOpticaldefaultJ/AJ/134/229/table2Original sample of objects in NGC 6388recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqObject identification (1)meta.id;meta.mainintXposX pixel coordinate (2)pixpos.cartesian.xdoubleYposY pixel coordinate (2)pixpos.cartesian.ydoubleT1magWashington T1 magnitude (633nm)magphot.mag;em.opt.Rfloate_T1mag1{sigma} error in T1magmagstat.error;phot.magfloatC-T1Washington (C-T1) color index (391-633nm)magphot.color;em.opt.U;em.opt.Rfloate_C-T11{sigma} error in C-T1magstat.errorfloatT1-T2Washington (T1-T2) color index (633-788nm)magphot.color;em.opt.R;em.opt.Ifloate_T1-T21{sigma} error in T1-T2magstat.errorfloat_RAPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.04'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.04'') (declination part)degpos.eq.dec;meta.mainJ/AJ/134/229/table3Sample of objects in 47 TucYposY pixel coordinate (2)pixpos.cartesian.ydoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqObject identification (1)meta.id;meta.mainintXposX pixel coordinate (2)pixpos.cartesian.xdoubleT1magWashington T1 magnitude (633nm)magphot.mag;em.opt.Rfloate_T1mag1{sigma} error in T1magmagstat.error;phot.magfloatC-T1Washington (C-T1) color index (391-633nm)magphot.color;em.opt.U;em.opt.Rfloate_C-T11{sigma} error in C-T1magstat.errorfloatT1-T2Washington (T1-T2) color index (633-788nm)magphot.color;em.opt.R;em.opt.Ifloate_T1-T21{sigma} error in T1-T2magstat.errorfloat_RAPosition computed from a comparison with UCAC2 (Cat. I/289 ({sigma}=0.03'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC2 (Cat. I/289 ({sigma}=0.03'') (declination part)degpos.eq.dec;meta.main