J/AJ/144/100ivo://CDS.VizieR/J/AJ/144/100doi:10.26093/cds/vizier.51440100CDSPiatti A.E.Geisler D.Mateluna R.2013-11-16T04:56:23Z2013-10-29T08:44:51ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsstellar-associationsvisible-astronomybroad-band-photometryWe present photometry for an unprecedented database of some 5.5million stars distributed throughout the Large Magellanic Cloud main body, from 21 fields covering a total area of 7.6deg^2^, obtained from Washington CT_1_T_2_ CTIO 4m MOSAIC data. Extensive artificial star tests over the whole mosaic image data set and the observed behavior of the photometric errors with magnitude demonstrate the accuracy of the morphology and clearly delineate the position of the main features in the color-magnitude diagrams (CMDs). The representative T_1_(MS TO) mags are on average ~0.5mag brighter than the T_1_ mags for the 100% completeness level of the respective field, allowing us to derive an accurate age estimate. We have analyzed the CMD Hess diagrams and used the peaks in star counts at the main sequence turnoff and red clump (RC) locations to age date the most dominant sub-population (or "representative" population) in the stellar population mix. The metallicity of this representative population is estimated from the locus of the most populous red giant branch track. We use these results to derive age and metallicity estimates for all of our fields. The analyzed fields span age and metallicity ranges covering most of the galaxy's lifetime and chemical enrichment, i.e., ages and metallicities between ~1 and 13Gyr and ~-0.2 and -1.2dex, respectively. We show that the dispersions associated with the mean ages and metallicities represent in general a satisfactory estimate of the age/metallicity spread (~1-3 Gyr/0.2-0.3 dex), although a few subfields have a slightly larger age/metallicity spread. Finally, we revisit the study of the vertical structure (VS) phenomenon, a striking feature composed of stars that extend from the bottom, bluest end of the RC to ~0.45mag fainter. We confirm that the VS phenomenon is not clearly seen in most of the studied fields and suggest that its occurrence is linked to some other condition(s) in addition to the appropriate age, metallicity, and the necessary red giant star density.2012AJ....144..100Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/100CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)II/232 : UBV photometry of selected regions in the MCs (Braun 2001)II/228 : DENIS Catalogue toward Magellanic Clouds (DCMC) (Cioni+ 2000)VII/183 : The Cluster System of the LMC (Kontizas+ 1990)J/MNRAS/425/3085 : CCD CT1 data of stars in the field of B119 (Piatti+, 2012)J/MNRAS/417/1559 : CT1T2 photometry in 14 SMC star clusters (Piatti+, 2011)J/PASP/123/519 : C,T1 photometry of 6 LMC clusters (Piatti+, 2011)J/A+A/501/585 : CT1 photometry in five LMC star clusters (Piatti+, 2009)J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)J/MNRAS/377/300 : CT1 photometry in 6 SMC star clusters (Piatti+, 2007)J/AJ/117/238 : LMC extended catalog (Bica+, 1999)J/AJ/116/723 : LMC star clusters ages and metallicity (Bica+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/100https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/100http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/100https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/144/100https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/144/100http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/144/100GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/144/100/table2 (CT1T2 data of stars in the Field 1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/100/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/100/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/100/table2?GETtext/xml+votable180.050000true65.35383-66.796490.0055555555555555566/33172 331732.9196443747461696e-19 3.2860540898823595e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/144/100?format=asciiOpticaldefaultJ/AJ/144/100/table2CT1T2 data of stars in the Field 1SeqRunning sequence numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainT1magThe Washington T1 band magnitudemagphot.mag;em.opt.Rfloate_T1magUncertainty in T1magstat.error;phot.magfloatC-T1The Washington (C-T1) color indexmagphot.color;em.opt.U;em.opt.Rfloate_C-T1Uncertainty in C-T1magstat.errorfloatT1-T2The Washington (T1-T2) color indexmagphot.color;em.opt.R;em.opt.Ifloate_T1-T2Uncertainty in T1-T2magstat.errorfloat