J/A+A/501/585ivo://CDS.VizieR/J/A+A/501/585doi:10.26093/cds/vizier.35010585CDSPiatti A.E.Geisler D.Sarajedini A.Gallart C.2009-08-24T23:32:37Z2009-08-24T23:25:57ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsstellar-associationsvisible-astronomybroad-band-photometryAims: We present CCD photometry in the Washington system C and T1 passbands down to T1~22.5 in the fields of NGC 1697, SL 133, NGC 1997, SL 663, and OHSC 28, five mostly unstudied star clusters in the LMC. Methods: Cluster radii were estimated from star counts in appropriate-sized boxes distributed throughout the entire observed fields. We perform a detailed analysis of the field star contamination and derive cluster colour-magnitude diagrams (CMDs). Based on the best fits of isochrones computed by the Padova group to the (T1, C-T_1_) CMDs, the {delta}(T1) index and the Standard Giant Branch procedure, we derive metallicities and ages for the five clusters. We combine our sample with clusters with ages and metallicities on a similar scale and examine relationships between position in the LMC, age and metallicity. Results: With the exception of NGC 1697 (age=0.7Gyr, [Fe/H]=0.0dex), the remaining four clusters are of intermediate-age (from 2.2 to 3.0Gyr) and relatively metal-poor ([Fe/H]=0.7dex). The cluster and field age-metallicty realtions show evidence for a metallicity offset but do overlap, particularly on the upper envelope side of the cluster age-metallicity relation. Conclusions: We confirm previous results that clusters younger than ~1Gyr were formed during an outside-in process; this occurred after a bust of cluster formation that took place mainly in the outer disk and peaked at ~2Gyr ago.2009A&A...501..585Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/501/585CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/183 : The Cluster System of the LMC (Kontizas+ 1990)J/AJ/117/238 : LMC extended catalog (Bica+, 1999)J/ApJ/611/270 : Magellanic star clusters IR fluctuations (Gonzalez+, 2004)J/ApJS/161/304 : Star clusters in the Milky Way & satellites (McLaughlin+ 2005)J/AJ/132/781 : 2MASS colours of Magellanic cloud star clusters (Pessev+ 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/501/585https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/501/585http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/501/585https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/501/585https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/501/585http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/501/585GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/501/585/table6 (Magnitudes and colours of stars in field of OHSC 28)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/501/585/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/501/585/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/501/585/table6?GETtext/xml+votable180.050000true88.76025556-62.236888890.005555555555555556Cone search capability for table J/A+A/501/585/table2 (Magnitudes and colours of stars in field of NGC 1697)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/501/585/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/501/585/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/501/585/table2?GETtext/xml+votable180.050000true72.4490217-68.65873420.005555555555555556Cone search capability for table J/A+A/501/585/table3 (Magnitudes and colours of stars in field of SL 133)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/501/585/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/501/585/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/501/585/table3?GETtext/xml+votable180.050000true74.4368022-65.37231920.005555555555555556Cone search capability for table J/A+A/501/585/table4 (Magnitudes and colours of stars in field of NGC 1997)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/501/585/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/501/585/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/501/585/table4?GETtext/xml+votable180.050000true82.6716133-63.12834390.005555555555555556Cone search capability for table J/A+A/501/585/table5 (Magnitudes and colours of stars in field of SL 663)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/501/585/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/501/585/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/501/585/table5?GETtext/xml+votable180.050000true85.7741603-65.49764390.0055555555555555566/33079 33111 33127 33794 33801 33803 33808-33809https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/501/585?format=asciiOpticaldefaultJ/A+A/501/585/table6Magnitudes and colours of stars in field of OHSC 28recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar numbermeta.id;meta.mainintXposX coordinate (1)pixpos.cartesian.x;instr.detfloatYposY coordinate (1)pixpos.cartesian.y;instr.detfloatT1Washington T1 magnitudemagphot.mag;em.opt.Rfloate_T1rms uncertainty on T1magstat.errorfloatC-T1Washington C-T1 colour indexmagphot.color;em.opt.U;em.opt.Rfloate_C-T1rms uncertainty on C-T1magstat.errorfloat_RAPosition computed from a comparison with 2MASS (Cat. II/246) ({sigma}=0.1'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (Cat. II/246) ({sigma}=0.1'') (declination part)degpos.eq.dec;meta.mainJ/A+A/501/585/table2Magnitudes and colours of stars in field of NGC 1697SeqStar numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXposX coordinate (1)pixpos.cartesian.x;instr.detfloatYposY coordinate (1)pixpos.cartesian.y;instr.detfloatT1Washington T1 magnitudemagphot.mag;em.opt.Rfloate_T1rms uncertainty on T1magstat.errorfloatC-T1Washington C-T1 colour indexmagphot.color;em.opt.U;em.opt.Rfloate_C-T1rms uncertainty on C-T1magstat.errorfloat_RAPosition computed from a comparison with 2MASS catalog II/246 ({sigma}=0.2'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS catalog II/246 ({sigma}=0.2'') (declination part)degpos.eq.dec;meta.mainJ/A+A/501/585/table3Magnitudes and colours of stars in field of SL 133recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar numbermeta.id;meta.mainintXposX coordinate (1)pixpos.cartesian.x;instr.detfloatYposY coordinate (1)pixpos.cartesian.y;instr.detfloatT1Washington T1 magnitudemagphot.mag;em.opt.Rfloate_T1rms uncertainty on T1magstat.errorfloatC-T1Washington C-T1 colour indexmagphot.color;em.opt.U;em.opt.Rfloate_C-T1rms uncertainty on C-T1magstat.errorfloat_RAPosition computed from a comparison with GSC2.3 (Cat. I/305) ({sigma}=0.4'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with GSC2.3 (Cat. I/305) ({sigma}=0.4'') (declination part)degpos.eq.dec;meta.mainJ/A+A/501/585/table4Magnitudes and colours of stars in field of NGC 1997recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar numbermeta.id;meta.mainintXposX coordinate (1)pixpos.cartesian.x;instr.detfloatYposY coordinate (1)pixpos.cartesian.y;instr.detfloatT1Washington T1 magnitudemagphot.mag;em.opt.Rfloate_T1rms uncertainty on T1magstat.errorfloatC-T1Washington C-T1 colour indexmagphot.color;em.opt.U;em.opt.Rfloate_C-T1rms uncertainty on C-T1magstat.errorfloat_RAPosition computed from a comparison with 2MASS Cat. II/246 ({sigma}=0.2'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS Cat. II/246 ({sigma}=0.2'') (declination part)degpos.eq.dec;meta.mainJ/A+A/501/585/table5Magnitudes and colours of stars in field of SL 663recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar numbermeta.id;meta.mainintXposX coordinate (1)pixpos.cartesian.x;instr.detfloatYposY coordinate (1)pixpos.cartesian.y;instr.detfloatT1Washington T1 magnitudemagphot.mag;em.opt.Rfloate_T1rms uncertainty on T1magstat.errorfloatC-T1Washington C-T1 colour indexmagphot.color;em.opt.U;em.opt.Rfloate_C-T1rms uncertainty on C-T1magstat.errorfloat_RAPosition computed from a comparison with 2MASS (Cat. II/246, {sigma}=0.2'') (right ascension part)degpos.eq.ra;meta.main_DEPosition computed from a comparison with 2MASS (Cat. II/246, {sigma}=0.2'') (declination part)degpos.eq.dec;meta.main