J/MNRAS/174/471ivo://CDS.VizieR/J/MNRAS/174/471doi:10.26093/cds/vizier.71740471CDSHawarden T.G.2017-07-10T06:37:30Z2016-07-15T14:22:25ZCDS support team

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

cds-question@unistra.fropen-star-clustersvisible-astronomyphotographic-photometryPhotoelectric and photographic photometry of the open cluster Melotte 66 is presented. The CM diagram shows most of the characteristics of an old cluster. The giant branch is broad with its blue edge populated preferentially by stars from the outer parts of the cluster. There is no detectable horizontal subgiant sequence. The main sequence turn-off colour, two-colour diagram and the colour difference between the turn-off and the subgiants are used to estimate the age and composition. Melotte 66 appears to have reddening E(B-V)=0.17mag and ultraviolet excess d(U-B)~0.1mag corresponding to [Fe/H]=-0.3. The cluster is probably between 6 and 7x10^9^yr old. A distance modulus (m-M)o=12.4mag is derived, which implies that the cluster lies about 750pc from the galactic plane.1976MNRAS.174..471Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/174/471CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/PASP/106/486 : Mel 66 CCD photometry (Anthony-Twarog+, 1994)J/A+A/283/911 : Abundances in NGC 2243 and Mel 66 (Gratton+ 1994)J/A+A/488/943 : Abundances of giants in four Galactic clusters (Sestito+ 2008)J/A+A/566/A39 : UBVI photometry of Melotte 66 (Carraro+, 2014)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/322 : UCAC4 Catalogue (Zacharias+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/174/471https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/174/471http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/174/471https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/174/471https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/174/471http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/174/471GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/174/471/Mel66 (Photographic magnitudes of stars within 7' from the centre of Melotte 66)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/174/471/Mel66?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/174/471/Mel66?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/174/471/Mel66?GETtext/xml+votable180.050000true111.56947917-47.671302780.0055555555555555566/39129 391313.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/174/471?format=asciiOpticaldefaultJ/MNRAS/174/471/table1Photoelectrix results for stars in Melotte 66NotesRemarks (2)meta.notecharnNumber of observationsmeta.numberintTelTelescope(s) used (1)instr.setupcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identification, as in table 2 plus E starsmeta.id.assoc;meta.tablecharVmagJohnson V-band photoelectric magnitudemagphot.mag;em.opt.Vfloatu_VmagUncertainty flag (:) on Vmagmeta.code.errorcharB-VJohnson (B-V) color indexmagphot.color;em.opt.B;em.opt.Vfloatu_B-VUncertainty flag (:) on Vmagmeta.code.error;phot.color;em.opt.BcharU-B? Johnson (U-B) color indexmagphot.color;em.opt.U;em.opt.BfloatnullableJ/MNRAS/174/471/Mel66Photographic magnitudes of stars within 7' from the centre of Melotte 66pSimbad column added by the CDSmeta.notechar2MASSStar name in 2MASS-PSC (II/246) (2)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1101/4355] Star identification (1)meta.id;meta.mainintVmagV-band photographic magnitudemagphot.mag;em.opt.VfloatB-VPhotographic (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatKJF[1/3727]? Star number in Kassis et al. (1997AJ....113.1723K) (2)meta.idintnullableRAJ2000Right Ascension J2000 (2)pos.eq.ra;meta.mainDEJ2000Declination J2000 (2)pos.eq.dec;meta.mainUCAC4Star name in ICAC4 (I/322) (2)meta.idcharCommentComment added at CDS (2)meta.notechar