J/A+A/319/850ivo://CDS.VizieR/J/A+A/319/850doi:10.26093/cds/vizier.33190850CDSOrtolani S.Barbuy B.Bica E.1998-02-26T14:14:00Z1998-02-26T15:13:43ZCDS support team

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

cds-question@unistra.frglobular-star-clustersphotometryWe study the globular cluster Terzan 4 projected close to the Galactic center, by means of V, I and Gunn z Colour-Magnitude Diagrams. The images were obtained under exceptional seeing conditions (0.35"-0.55") at the ESO New Technology Telescope equipped with SUSI. We derive a reddening of E(B-V)=2.35 and a distance from the Sun d_{sun}_=8.3kpc for Terzan 4. From the similarity of the VI Colour-Magnitude Diagrams of Terzan 4 and M30, in particular the presence of a blue horizontal branch, it could be as metal-poor as [Fe/H]=~-2.0. It is therefore another blue horizontal branch globular cluster located close to the Galactic center.1997A&A...319..850Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/319/850CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/319/850https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/319/850http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/319/850https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/319/850https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/319/850http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/319/850GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/319/850/ter4izI, Gunn z photometry of Terzan 4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequence numbermeta.id;meta.mainintXposx pixel coordinate in Fig. 1pixpos.cartesian.x;instr.detfloatYposy pixel coordinate in Fig. 1pixpos.cartesian.y;instr.detfloatImag? I magnitudemagphot.mag;em.opt.IfloatnullableI-z? I-z color indexmagphot.colorfloatnullableJ/A+A/319/850/ter4viV, I photometry of Terzan 4SeqSequence numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposx pixel coordinate in Fig. 1pixpos.cartesian.x;instr.detfloatYposy pixel coordinate in Fig. 1pixpos.cartesian.y;instr.detfloatVmag? V magnitudemagphot.mag;em.opt.VfloatnullableV-I? V-I color indexmagphot.color;em.opt.V;em.opt.Ifloatnullable