J/A+AS/122/9ivo://CDS.VizieR/J/A+AS/122/9CDSSagar R.Cannon R.D.2013-09-23T14:44:53Z1997-12-09T19:36:02ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryvisible-astronomyWide-band photometryCCD observations in the U, B, V, R and I passbands have been used to generate colour-colour and deep colour-magnitude diagrams for the young open star clusters NGC 3228, NGC 4103, NGC 5662 and NGC 6087. The sample consists of about 2000 stars reaching down to V=20mag. The interstellar extinction across the face of the imaged cluster regions seems to be uniform with average values of E(B-V)=0.31, 0.34 and 0.22mag for NGC 4103, NGC 5662 and NGC 6087 respectively. The distances to the clusters NGC 3228, NGC 4103, NGC 5662 and NGC 6087 have been estimated as 0.5+/-0.05, 2.0+/-0.3, 0.8+/-0.1 and 1.0+/-0.1kpc respectively, while the corresponding ages estimated from the theoretical stellar evolutionary isochrones fitted to the bright proper motion cluster members are ~100, 30, 80 and 65Myr respectively. Present data are consistent with the membership of the Cepheid variable V Cen to NGC 5662 and of S Norm to NGC 6087. Heavy contamination by foreground and background field stars has unfortunately made it impossible to reach definite conclusions about the faint luminosity function, and the data do not reach faint enough limits to investigate pre-main sequence stars. Description; The observations in UBV Johnson and RI Kron-Cousins passbands were carried out between 27March-02April and 22-28June 1989 on the ANU 1.0m telescope at Siding Spring Observatory, using a blue coated GEC P8603 CCD in an Astromed camera system mounted at the f/8 Cassegrain focus; the scale is 0.56arcsec/pix, and the brightness range is 8.8-16.5mag in V. During the observations typical seeing was 1.5arcsec.1997A&AS..122....9Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/122/9CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/122/9https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/122/9http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/122/9https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/122/9https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/122/9http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/122/9GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/122/9/table8 (Relative positions and UBVRI mag in NGC 5662)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/122/9/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/122/9/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/122/9/table8?GETtext/xml+votable180.050000true219.0208383-56.58602030.005555555555555556Cone search capability for table J/A+AS/122/9/table6 (Relative positions and UBVRI mag in NGC 3228)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/122/9/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/122/9/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/122/9/table6?GETtext/xml+votable180.050000true155.36157278-51.856718330.005555555555555556Cone search capability for table J/A+AS/122/9/table7 (Relative positions and UBVRI mag in NGC 4103)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/122/9/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/122/9/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/122/9/table7?GETtext/xml+votable180.050000true181.6876167-61.23212780.005555555555555556Cone search capability for table J/A+AS/122/9/table9a (Relative positions and UBVI mag in Region 1 of NGC 6087)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/122/9/table9a?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/122/9/table9a?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/122/9/table9a?GETtext/xml+votable180.050000true244.7895142-57.87425310.005555555555555556Cone search capability for table J/A+AS/122/9/table9b (Relative positions and UBVRI mag in Regions 2 and 3 of NGC 6087)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/122/9/table9b?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/122/9/table9b?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/122/9/table9b?GETtext/xml+votable180.050000true244.8947228-57.95585190.0055555555555555566/38073 41461 41863 430483.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/122/9?format=asciiOpticalInfrareddefaultJ/A+AS/122/9/table8Relative positions and UBVRI mag in NGC 5662recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential star numbermeta.id;meta.mainintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmagV Johnson magnitudemagphot.mag;em.opt.VfloatU-B? U-B Johnson colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-V? B-V Johnson colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-R? V-R Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-I? V-I Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableNameOther identifications (1)meta.idchar_RAPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.14'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.14'') (declination part)degpos.eq.dec;meta.mainJ/A+AS/122/9/table6Relative positions and UBVRI mag in NGC 3228recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential star numbermeta.id;meta.mainintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmagV Johnson magnitudemagphot.mag;em.opt.VfloatU-B? U-B Johnson colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-V? B-V Johnson colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-R? V-R Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-I? V-I Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableNameOther identifications (1)meta.idchar_RAPosition computed from a comparison with UCAC3 I/315 ({sigma}=0.19'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC3 I/315 ({sigma}=0.19'') (declination part)degpos.eq.dec;meta.mainJ/A+AS/122/9/table7Relative positions and UBVRI mag in NGC 4103recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential star numbermeta.id;meta.mainintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmagV Johnson magnitudemagphot.mag;em.opt.VfloatU-B? U-B Johnson colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-V? B-V Johnson colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-R? V-R Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-I? V-I Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableNameOther identifications (1)meta.idchar_RAPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.35'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.35'') (declination part)degpos.eq.dec;meta.mainJ/A+AS/122/9/table9aRelative positions and UBVI mag in Region 1 of NGC 6087recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential star numbermeta.id;meta.mainintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmagV Johnson magnitudemagphot.mag;em.opt.VfloatU-B? U-B Johnson colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-V? B-V Johnson colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-IV-I Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.IfloatNameOther identifications (1)meta.idchar_RAPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.23'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.23'') (declination part)degpos.eq.dec;meta.mainJ/A+AS/122/9/table9bRelative positions and UBVRI mag in Regions 2 and 3 of NGC 6087recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential star numbermeta.id;meta.mainintXposX positionpixpos.cartesian.x;instr.detdoubleYposY positionpixpos.cartesian.y;instr.detdoubleVmagV Johnson magnitudemagphot.mag;em.opt.VfloatU-B? U-B Johnson colour indexmagphot.color;em.opt.U;em.opt.BfloatnullableB-V? B-V Johnson colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-R? V-R Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.RfloatnullableV-I? V-I Kron-Cousins colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableNameOther identifications (1)meta.idchar_RAPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.14'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with UCAC3 (I/315) ({sigma}=0.14'') (declination part)degpos.eq.dec;meta.main