J/A+A/554/A16ivo://CDS.VizieR/J/A+A/554/A16doi:10.26093/cds/vizier.35540016CDSLivanou E.Dapergolas A.Kontizas M.Nordstroem B.Kontizas E.,Andersen J.Dirsch B.Karampelas A.2017-09-22T16:15:33Z2013-05-30T14:10:13ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsglobular-star-clustersvisible-astronomymedium-band-photometryWe study small open star clusters, using Stroemgren photometry to investigate a possible dependence between age and metallicity in the Magellanic Clouds (MCs). Our goals are to trace evidence of an age metallicity relation (AMR) and correlate it with the mutual interactions of the two MCs and to correlate the AMR with the spatial distribution of the clusters. In the Large Magellanic Cloud (LMC), the majority of the selected clusters are young (up to 1Gyr), and we search for an AMR at this epoch, which has not been much studied. We report results for 15 LMC and 8 Small Magellanic Cloud (SMC) clusters, scattered all over the area of these galaxies, to cover a wide spatial distribution and metallicity range. The selected LMC clusters were observed with the 1.54m Danish Telescope in Chile, using the Danish Faint Object Spectrograph and Camera (DFOSC) with a single 2kx2k CCD. The SMC clusters were observed with the ESO 3.6m Telescope, also in Chile, using the ESO Faint Object Spectrograph and Camera (EFOSC). The obtained frames were analysed with the conventional DAOPHOT and IRAF software. We used Stroemgren filters in order to achieve reliable metallicities from photometry. Isochrone fitting was used to determine the ages and metallicities. The AMR for the LMC displays a metallicity gradient, with higher metallicities for the younger ages. The AMR for LMC-SMC star clusters shows a possible jump in metallicity and a considerable increase at about 6x10^8^yr. It is possible that this is connected to the latest LMC-SMC interaction. The AMR for the LMC also displays a metallicity gradient with distance from the centre. The metallicities in SMC are lower, as expected for a metal-poor host galaxy.2013A&A...554A..16Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/554/A16CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/183 : The Cluster System of the LMC (Kontizas+ 1990)J/MNRAS/417/1559 : CT1T2 photometry in 14 SMC star clusters (Piatti+, 2011)J/A+A/517/A50 : Ages + luminosities of SMC/LMC star clusters (Glatt+, 2010)J/AJ/136/1703 : Ridgelines of 6 intermediate-age SMC clusters (Glatt+, 2008)J/MNRAS/377/300 : CT1 photometry in 6 SMC star clusters (Piatti+, 2007)J/A+A/452/179 : Ages of SMC young clusters and field stars (Chiosi+, 2006)J/AJ/129/2701 : UBVRI photometry of SMC star clusters (Rafelski+, 2005)J/AJ/116/723 : LMC star clusters ages and metallicity (Bica+ 1998)J/A+AS/108/571 : Photometry of the SMC cluster NGC 330 (Vallenari+, 1994)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/554/A16https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/554/A16http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/554/A16https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/554/A16https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/554/A16http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/554/A16GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/554/A16/clusters (Clusters observing log, ages and metallicities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/554/A16/clusters?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/554/A16/clusters?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/554/A16/clusters?GETtext/xml+votable180.050000true75.95-69.162220.0055555555555555566/32958 33031 33056 33077 33091 33096 33098 33304 33306 33315-33317 33328 33798 37408https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/554/A16?format=asciiOpticaldefaultJ/A+A/554/A16/clustersClusters observing log, ages and metallicitiesNyNumber of frames in y bandmeta.numberintNbNumber of frames in b bandmeta.numberintNvNumber of frames in v bandmeta.numberintt.vExposure time in v bandstime.expointrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster name (1)meta.id;meta.maincharONameOther namemeta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maint.yExposure time in y bandstime.expointt.bExposure time in b bandstime.expointDateObservation date (YYYY/MM/DD,DD)time.epoch;obscharFile.ClFile name with cluster data in subdirectory photmeta.idcharFile.FldFile name with cluster field data in subdirectory photmeta.idcharMCLMC or SMCmeta.id.parentcharAgeCluster age (2)Gyrtime.agefloat[Fe/H]Metallicity (Stromgren) (2) (3)log(Sun)phys.abund.Zfloatf_[Fe/H][a] a: adopted from the Isochronesmeta.codechar[Fe/H]IMetallicity (Isochrones) (2) (3)log(Sun)phys.abund.FefloatE(b-y)Extinctionmagphot.color.excessfloatSimbadNameSimbad column added by the CDSmeta.idchar