J/MNRAS/441/L36ivo://CDS.VizieR/J/MNRAS/441/L36doi:10.26093/cds/vizier.74419036CDSCarraro G.Giorgi E.E.Costa E.Vazquez R.A.2024-08-09T20:15:13Z2015-12-10T08:13:29ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomybroad-band-photometryGalactic open clusters do not survive long in the high-density regions of the inner Galactic disc. Inside the solar ring only 11 open clusters are known with ages older than 1Gyr. We show here, basing on deep, high-quality photometry, that NGC 4337, contrary to earlier findings, is indeed an old open cluster. The cluster is located very close to the conspicuous star cluster Trumpler 20, as well misclassified in the past, and that has received so much attention in recent years. NGC 4337 shows a significant clump of He-burning stars which was not detected previously. Its beautiful colour-magnitude diagram is strikingly similar to the one of the classical old open clusters IC 4651, NGC 752, and NGC 3680, and this suggests similar age and composition. A spectroscopic study is much needed to confirm our findings. This, in turn, would also allow us to better define the inner disc radial abundance gradient and its temporal evolution. To this aim, a list of clump star candidates is provided.2014MNRAS.441L..36Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/441/L36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/361/929 : IC 4651 uvby photometry (Meibom, 2000)J/AJ/127/1000 : NGC 3680 Stromgren and Ca photometry (Anthony-Twarog+, 2004)J/MNRAS/356/647 : NGC 6404 and 6583 VI photometry (Carraro+, 2005)J/MNRAS/371/1301 : BVI photometry of six old open clusters (Carraro+, 2006)J/A+A/464/573 : VI photometry of 5 open clusters (Carraro+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/441/L36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/441/L36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/441/L36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/441/L36https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/441/L36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/441/L36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/441/L36/table2 (Photometric data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/441/L36/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/441/L36/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/441/L36/table2?GETtext/xml+votable180.050000true186.2049654-58.11844970.0055555555555555566/43054-43055 43140-431413.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/441/L36?format=asciiOpticalInfrareddefaultJ/MNRAS/441/L36/table2Photometric datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/8197] Sequential numbermeta.recordintXposX positionpixpos.cartesian.x;instr.detfloatYposY positionpixpos.cartesian.y;instr.detfloatRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.Vfloate_Vmagrms uncertainty on Vmagmagstat.error;phot.mag;em.opt.VfloatB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloate_B-Vrms uncertainty on B-Vmagstat.error;phot.color;em.opt.BfloatU-B? U-B colour indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? rms uncertainty on U-Bmagstat.error;phot.color;em.opt.UfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-I? rms uncertainty on V-Imagstat.error;phot.color;em.opt.Vfloatnullable