J/A+A/606/A21ivo://CDS.VizieR/J/A+A/606/A21doi:10.26093/cds/vizier.36060021CDSPiatti A.E.2017-10-26T12:02:11Z2017-09-29T07:40:38ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsstellar-associationsvisible-astronomybroad-band-photometryWe report results on star clusters located in the South-Eastern half of the Large Magellanic (LMC) bar fromWashington CT1 photometry. Using appropriate kernel density estimators we detected 73 star cluster candidates, three of which do not show any detectable trace of star cluster sequences in their colour-magnitude diagrams (CMDs).We did not detect other 38 previously catalogued clusters, which could not be recognized when visually inspecting the C and T1 images either; the distribution of stars in their respective fields do not resemble that of an stellar aggregate. They represent ~33 per cent of all catalogued objects located within the analysed LMC bar field. From matching theoretical isochrones to the cluster CMDs cleaned from field star contamination, we derived ages in the range 7.2<log(t[yr^-1^])<10.1. As far as we are aware, this is the first time homogeneous age estimates based on resolved stellar photometry are obtained for most of the studied clusters. We built the cluster frequency (CF) for the surveyed area, and found that the major star cluster formation activity has taken place during the period log(t[yr^-1^])~8.0-9.0. Since ~100Myr ago, clusters have been formed during few bursting formation episodes. When comparing the observed CF to that recovered from the star formation rate we found noticeable differences, which suggests that field star and star cluster formation histories could have been significantly different.2017A&A...606A..21Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/606/A21CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/606/A21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/606/A21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/606/A21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/606/A21https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/606/A21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/606/A21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/606/A21/table2 (Fundamental properties of the star cluster sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/606/A21/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/606/A21/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/606/A21/table2?GETtext/xml+votable180.050000true80.6136667-69.74527780.005555555555555556Cone search capability for table J/A+A/606/A21/clusters (Magnitudes and colours of stars of the 70 clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/606/A21/clusters?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/606/A21/clusters?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/606/A21/clusters?GETtext/xml+votable180.050000true80.6160375-69.760058330.0055555555555555566/33096-330982.9196443747461696e-19 5.696014567210867e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/606/A21?format=asciiOpticaldefaultJ/A+A/606/A21/table2Fundamental properties of the star cluster samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameCluster namemeta.id;meta.maincharE(V-I)V-I colour excessmagphot.color.excessfloatn_E(V-I)[)] Note on E(V-I) (1)meta.notecharlogtAgelog(yr**-1)time.agefloatNstarNumber of stars in the clustermeta.numberintClusterCluster shorted name (as in clusters.dat file)meta.idcharFileNameName of the individual cluster file in subdirectory filesmeta.idcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/A+A/606/A21/clustersMagnitudes and colours of stars of the 70 clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster shorted namemeta.idcharprimaryIDStar number within the clustermeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)pos.eq.dec;meta.mainCmag? C magnitudemagphot.mag;em.opt.Ufloatnullablee_Cmag? rms uncertainty on Cmagmagstat.error;phot.magfloatnullableT1mag? T1 magnitudemagphot.mag;em.opt.Rfloatnullablee_T1mag? rms uncertainty on T1magmagstat.error;phot.magfloatnullableMemb[1/4] Membership probability code (G1)meta.code;stat.probabilityint