J/ApJS/73/671ivo://CDS.VizieR/J/ApJS/73/671doi:10.26093/cds/vizier.20730671CDSCOUTURE J.HARRIS W.E.ALLWRIGHT J.W.B.1997-12-09T20:09:30Z1997-12-09T21:09:27ZCDS support team

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

cds-question@unistra.frglobular-star-clustersccd-photometryWe present CCD photometry in B, V, and I for a sample of globular clusters in the Virgo central giant elliptical galaxy M87. Our measured sample comprises 270 objects brighter than V~23.4mag and with distances r>25" (>2kpc) from the center of the galaxy. In agreement with the recent study of Cohen, we find no detectable gradient of mean cluster color (metallicity) in (B-V) or (V-I) with radial distance. The cluster system does, however, display a large dispersion in color at any radius, corresponding to sigma([Fe/H])~0.6 about a mean metallicity (Fe/H]>~-1.1 according to our color index scale. The difference in mean color between the globular clusters and the underlying halo light of the galaxy itself, found previously by Strom and coworkers and by Cohen, shows up strongly in all of our color indices; we find virtually no clusters as red as mean color of the halo stars at any radius.1990ApJS...73..671Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/73/671CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/73/671https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/73/671http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/73/671https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/73/671https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/73/671http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/73/671GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJS/73/671/table2BVI photometry of M87 globular clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqNumStarlike sequential numbermeta.id;meta.mainintXposX positionpixpos.cartesian.x;instr.detfloatYposY positionpixpos.cartesian.y;instr.detfloatDistDistancearcsecpos.angDistancefloatVmagV magnitudemagphot.mag;em.opt.VfloatB-V(B-V) colormagphot.color;em.opt.B;em.opt.VfloatV-I(V-I) colormagphot.color;em.opt.V;em.opt.IfloatS6[]? Cross-identification with S6 catalogmeta.id.crossint