J/AcA/50/337ivo://CDS.VizieR/J/AcA/50/337doi:10.26093/cds/vizier.120500337CDSPietrzynski G.Udalski A.2025-09-25T20:14:39Z2008-01-20T07:32:36ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsstellar-associationsstellar-agesWe present results of age determination based on the standard procedure of isochrone fitting for about 600 star clusters younger than about 1.2Gyr from the central parts of the LMC. Comparison of age distributions of star clusters from the LMC and the SMC shows that cluster formation histories are different in these galaxies. The age distribution of the LMC clusters reveals bursty nature of cluster formation in this galaxy, with contrast to the relatively uniform distribution of cluster ages in the SMC. We detected three extended peaks in the distribution of ages of LMC clusters, located at about 7Myr, 125Myr and 0.8Gyr. All detected peaks have complex structure. While the structure of the youngest and the oldest peaks may be spurious due to accuracy of age determination, in the middle peak two evident sub-peaks at 100Myr and 160Myr are clearly seen. Similar peaks are seen in the distribution of ages of clusters from the SMC, which indicates that increased cluster formation ratio during these periods might be caused by the last encounter between the Magellanic Clouds. The sample of clusters from the LMC is overabundant in very young (<10Myr) anal old (>400Myr) clusters, and underabundant in clusters having ages in the range from 80 to 15Myr with respect to the studied sample of clusters from the SMC.2000AcA....50..337Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AcA/50/337CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/49/521 : OGLE LMC star clusters BVI photometry (Pietrzynski+, 1999)J/AcA/50/355 : OGLE Multiple Cluster Candidates in LMC (Pietrzynski+, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AcA/50/337https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AcA/50/337http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AcA/50/337https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AcA/50/337https://vizier.iucaa.in/viz-bin/votable?-source=J/AcA/50/337http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AcA/50/337GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AcA/50/337/table1 (Ages of the LMC clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/50/337/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/50/337/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/50/337/table1?GETtext/xml+votable180.050000true74.9984583-69.51088890.0055555555555555565/8272 8274 6/33053 33055 33077 33102 33120-33121 33123-33126https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AcA/50/337?format=asciidefaultJ/AcA/50/337/table1Ages of the LMC clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOGLE-CL[1-745]+ Sequential number (OGLE-CL LMC NNNN)meta.recordintprimaryindexedRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainRadApparent radius of clusterarcsecphys.angSize;srcintl_logtLimit flag on logtmeta.code.errorcharlogtAge of clusterlog(yr)time.agefloate_logt? rms uncertainty on logtlog(yr)stat.errorfloatnullablelogt2? Second value for Agelog(yr)time.agefloatnullablee_logt2? rms uncertainty of logt2 if different of e_logtlog(yr)stat.errorfloatnullable