J/ApJ/761/33ivo://CDS.VizieR/J/ApJ/761/33doi:10.26093/cds/vizier.17610033CDSLapenna E.Mucciarelli A.Origlia L.Ferraro F.R.2017-06-26T11:48:52Z2014-09-04T09:09:23ZCDS support team

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

cds-question@unistra.frmagellanic-cloudschemical-abundancesinfrared-photometryradial-velocitygiant-starsWe have used high-resolution spectra obtained with the multifiber facility FLAMES at the Very Large Telescope of the European Southern Observatory to derive kinematic properties and chemical abundances of Fe, O, Mg, and Si for 89 stars in the disk of the Large Magellanic Cloud (LMC). The derived metallicity and [{alpha}/Fe], obtained as the average of O, Mg, and Si abundances, allow us to draw a preliminary scheme of the star formation history of this region of the LMC. The derived metallicity distribution shows two main components: one component (comprising ~84% of the sample) peaks at [Fe/H]=-0.48dex and it shows an [{alpha}/Fe] ratio slightly under solar ([{alpha}/Fe]~-0.1dex). This population probably originated in the main star formation event that occurred 3-4Gyr ago (possibly triggered by tidal capture of the Small Magellanic Cloud). The other component (comprising ~16% of the sample) peaks at [Fe/H]~-0dex and it shows an [{alpha}/Fe]~0.2dex. This population was probably generated during the long quiescent epoch of star formation between the first episode and the most recent bursts. Indeed, in our sample we do not find stars with chemical properties similar to the old LMC globular clusters nor to the iron-rich and {alpha}-poor stars recently found in the LMC globular cluster NGC 1718 and also predicted to be in the LMC field, thus suggesting that both of these components are small (<1%) in the LMC disk population.2012ApJ...761...33Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/761/33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)IV/33 : Master Catalogue towards the Magellanic Clouds (MC2) (Delmotte+ 2002)J/AcA/62/247 : LMC maps from OGLE-III shallow survey (Ulaczyk+, 2012)J/AJ/144/186 : Variables in LMC globular clusters. II. NGC 1786 (Kuehn+, 2012)J/ApJ/749/124 : Spectroscopy on LMC clusters (Colucci+, 2012)J/ApJ/746/29 : High-resolution GC abundances. IV. 8 LMC GCs (Colucci+, 2012)J/ApJ/735/55 : High-resolution GCs abundances. III. LMC (Colucci+, 2011)J/ApJ/717/277 : Chemical composition of old LMC clusters (Mucciarelli+, 2010)J/ApJ/695/L134 : Chemical anomalies in old LMC clusters (Mucciarelli+, 2009)J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)J/AJ/136/375 : Chemical composition of LMC red giants (Mucciarelli+, 2008)J/AJ/135/836 : Calcium triplet index in LMC stars (Carrera+, 2008)J/A+A/480/379 : Abundances of 59 red giants in LMC (Pompeia+, 2008)J/AJ/132/1630 : CaII spectro. in Magellanic Cloud clusters (Grocholski+, 2006)J/AJ/129/1465 : Spectroscopy of red giants in the LMC bar (Cole+, 2005)J/AJ/128/1606 : Magellanic Clouds Phot. Survey: the LMC (Zaritsky+, 2004)J/MNRAS/339/701 : Velocities and BR photometry in LMC (Zhao+, 2003)J/A+AS/142/467 : Broadening of metallic lines by H collisions (Barklem+ 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/761/33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/761/33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/761/33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/761/33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/761/33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/761/33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/761/33/stars (Photometry, spectroscopic atmospheric parameters and derived abundances for the giant star members of the disk of the LMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/761/33/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/761/33/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/761/33/stars?GETtext/xml+votable180.050000true74.84290306-67.752937220.0055555555555555566/33121 33122 331238.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/761/33?format=asciiOpticalInfrareddefaultJ/ApJ/761/33/starsPhotometry, spectroscopic atmospheric parameters and derived abundances for the giant star members of the disk of the LMCe_[Mg/Fe]? Uncertainty in [Mg/Fe]log(Sun)stat.error;phys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[353/95454] Identifiermeta.id;meta.mainintRAJ2000[74.2/75.4] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-67.95/-67.55] Declination (J2000)degpos.eq.dec;meta.mainJmag[12.5/15] 2MASS J band magnitudemagphot.mag;em.IR.JfloatHmag[11.8/14.2] 2MASS H band magnitudemagphot.mag;em.IR.HfloatKsmag[11.7/14] 2MASS Ks band magnitudemagphot.mag;em.IR.KfloatTphot[3535/4676] Photometric effective temperature estimateKphys.temperature.effectiveintloggp[0.3/1.4] Log of the photometric surface gravity estimatelog(cm.s**-2)phys.gravityfloatRVel[211.7/327.7] Radial velocitykm/sphys.veloc;pos.heliocentricfloatTspec[3600/4950] Spectroscopic effective temperature estimateKphys.temperature.effectiveintloggsLog of the spectroscopic surface gravity estimatelog(cm.s**-2)phys.gravityfloat[A/H][-1.5/0] Overall metallic abundance ratiolog(Sun)phys.abund.Z;arith.ratiofloatVt[1.2/2.4] Spectroscopic turbulent velocity {xi}km/sphys.veloc.microTurbfloat[Fe/H][-1.6/-0.09] The Fe/H number abundancelog(Sun)meta.idfloate_[Fe/H][0.01/0.06] Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.Fefloat[O/Fe]? The O/Fe number abundancelog(Sun)meta.idfloatnullablee_[O/Fe]? Uncertainty in [O/Fe]log(Sun)stat.error;phys.abundfloatnullable[Mg/Fe]? The Mg/Fe number abundancelog(Sun)meta.idfloatnullable[Si/Fe][-0.3/0.5] The Si/Fe number abundancelog(Sun)meta.idfloate_[Si/Fe][0.01/0.2] Uncertainty in [Si/Fe]log(Sun)stat.error;phys.abundfloatLCatCross-match within 1" with LMC catalogs: Zaritsky+, 2004, Cat. J/AJ/128/1606 and Ulaczyk+, 2012, Cat. J/AcA/62/247meta.ref.urlintnullable2MDisplay the 2MASS data within 1" (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar