J/AJ/132/1630ivo://CDS.VizieR/J/AJ/132/1630doi:10.26093/cds/vizier.51321630CDSGrocholski A.J.Cole A.A.Sarajedini A.Geisler D.Smith V.V.2017-09-27T05:55:52Z2008-10-05T13:37:57ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsstellar-associationsopen-star-clustersradial-velocitymetallicityUsing the FORS2 instrument on the Very Large Telescope, we have obtained near-infrared spectra for more than 200 stars in 28 populous LMC clusters. This cluster sample spans a large range of ages (~113Gyr) and metallicities (-0.3>~[Fe/H]>~-2.0) and has good areal coverage of the LMC disk. The strong absorption lines of the Ca II triplet are used to derive cluster radial velocities and abundances. We determine mean cluster velocities to typically 1.6km/s and mean metallicities to 0.04dex (random error). For eight of these clusters, we report the first spectroscopically determined metallicities based on individual cluster stars, and six of these eight have no published radial velocity measurements. Combining our data with archival Hubble Space Telescope WFPC2 photometry, we find that the newly measured cluster, NGC 1718, is one of the most metal-poor ([Fe/H]~-0.80) intermediate-age (~2Gyr) inner disk clusters in the LMC. Similar to what was found by previous authors, this cluster sample has radial velocities consistent with that of a single rotating disk system, with no indication that the newly reported clusters exhibit halo kinematics. In addition, our findings confirm previous results that show that the LMC lacks the metallicity gradient typically seen in non-barred spiral galaxies, suggesting that the bar is driving the mixing of stellar populations in the LMC.2006AJ....132.1630Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/132/1630CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/117/238 : LMC extended catalog (Bica+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/132/1630https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/132/1630http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/132/1630https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/132/1630https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/132/1630http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/132/1630GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/132/1630/table1 (LMC target cluster information, RV and [Fe/H])https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/132/1630/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/132/1630/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/132/1630/table1?GETtext/xml+votable180.050000true68.15833-72.340830.005555555555555556Cone search capability for table J/AJ/132/1630/table3 (Positions and measured values for all cluster members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/132/1630/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/132/1630/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/132/1630/table3?GETtext/xml+votable180.050000true68.1735417-72.349750.0055555555555555566/32790 32863 33031 33045 33048 33054 33060 33062 33078 33080 33084 33088 33096 33101 33111 33117 33119 33123 33124 33793 33922 37386 37504 37513 37537 37550 38914 38922https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/132/1630?format=asciiOpticaldefaultJ/AJ/132/1630/table1LMC target cluster information, RV and [Fe/H]recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id;meta.maincharprimaryONamesOther name(s)meta.idcharRAJ2000Right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000) (1)pos.eq.dec;meta.mainDiamDiameter (1)arcminphys.angSizefloatn_Diam[c] c: Estimated via comparisons with target clustersmeta.notecharVmagV magnitude (2)magphot.mag;em.opt.VfloatSWBSWB type (2) (3)src.classcharn_SWB[c] c: Estimated via comparisons with target clustersmeta.notecharExpTimeExposure timestime.duration;obs.exposurecharNst? Number of stars in the clustermeta.numberintnullableRV? Cluster radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloatnullablee_RV? rms uncertainty on RVkm/sstat.errorfloatnullable[Fe/H]? Cluster metallicitylog(Sun)phys.abund.Zfloatnullablee_[Fe/H]? rms uncertainty on [Fe/H]log(Sun)stat.error;phys.abund.FefloatnullableSimbadNameSimbad column added by the CDSmeta.idcharJ/AJ/132/1630/table3Positions and measured values for all cluster membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id.parentcharIDCluster member identification number (1)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVThe 1{sigma} error in HRVkm/sstat.errorfloatV-VHBBrightness difference between star and cluster's horizontal branchmagphot.mag;arith.difffloatWCaIISummed Ca II equivalent width (2)0.1nmspect.line.eqWidthfloate_WCaIIThe 1{sigma} error in SigmaW0.1nmstat.errorfloat