J/A+A/601/A70ivo://CDS.VizieR/J/A+A/601/A70doi:10.26093/cds/vizier.36010070CDSSpina L.Randich S.Magrini L.Jeffries R.D.Friel E.D.Sacco G.G.,Pancino E.Bonito R.Bravi L.Franciosini E.Klutsch A.Montes D.,Gilmore G.Vallenari A.Bensby T.Bragaglia A.Flaccomio E.,Koposov S.E.Korn A.J.Lanzafame A.C.Smiljanic R.Bayo A.Carraro G.,Casey A.R.Costado M.T.Damiani F.Donati P.Frasca A.Hourihane A.,Jofre P.Lewis J.Lind K.Monaco L.Morbidelli L.Prisinzano L.,Sousa S.G.Worley C.C.Zaggia S.2017-05-11T14:34:19Z2017-05-04T07:32:47ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyopen-star-clusterseffective-temperaturechemical-abundancesThe radial metallicity distribution in the Galactic thin disc represents a crucial constraint for modelling disc formation and evolution. Open clusters allow us to derive both the radial metallicity distribution and its evolution over time. In this paper we perform the first investigation of the present-day radial metallicity distribution based on [Fe/H] determinations in late type members of pre-main-sequence clusters. Because of their youth, these clusters are therefore essential for tracing the current inter-stellar medium metallicity. We used the products of the Gaia-ESO Survey analysis of 12 young regions (age<100Myr), covering Galactocentric distances from 6.67 to 8.70kpc. For the first time, we derived the metal content of star forming regions farther than 500pc from the Sun. Median metallicities were determined through samples of reliable cluster members. For ten clusters the membership analysis is discussed in the present paper, while for other two clusters (Chamaeleon I and Gamma Velorum) we adopted the members identified in our previous works. All the pre-main-sequence clusters considered in this paper have close-to-solar or slightly sub-solar metallicities. The radial metallicity distribution traced by these clusters is almost flat, with the innermost star forming regions having [Fe/H] values that are 0.10-0.15dex lower than the majority of the older clusters located at similar Galactocentric radii. This homogeneous study of the present-day radial metallicity distribution in the Galactic thin disc favours models that predict a flattening of the radial gradient over time. On the other hand, the decrease of the average [Fe/H] at young ages is not easily explained by the models. Our results reveal a complex interplay of several processes (e.g. star formation activity, initial mass function, supernova yields, gas flows) that controlled the recent evolution of the Milky Way.2017A&A...601A..70Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/601/A70CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/A+A/567/A55 : Metallicity of the {gamma} Vel cluster (Spina+, 2014)J/A+A/569/A17 : Gaia-ESO Survey: NGC6705 (Cantat-Gaudin+, 2014)J/A+A/572/A33 : Abundances from Gaia-ESO Survey (Mikolaitis+, 2014)J/A+A/573/A55 : Gaia-ESO Survey: Tr 20, NGC4815, NGC6705 (Tautvaisiene+, 2015)J/A+A/575/A4 : Activity and accretion in {gamma} Vel and Cha I (Frasca+, 2015)J/A+A/598/A5 : Gaia-ESO Survey iDR4 calibrators (Pancino+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/601/A70https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/601/A70http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/601/A70https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/601/A70https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/601/A70http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/601/A70GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/601/A70/table1 (Stellar parameters, EWs of the lithium line at 6707.8{AA} and gamma indexes of cluster members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/601/A70/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/601/A70/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/601/A70/table1?GETtext/xml+votable180.050000true99.89158339.82244440.0055555555555555566/23636-23637 23639 28890-28891 31788 31790 37227 37229-37231 37240-37242 37316-37317 37787-37788 37790 38016 39181 39183 39192 39352 39354-39355 39685 39696-39698 42980-42981 42983 42992https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/601/A70?format=asciidefaultJ/A+A/601/A70/table1Stellar parameters, EWs of the lithium line at 6707.8{AA} and gamma indexes of cluster memberse_TeffError on TeffKstat.error;phys.temperature.effectiveintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCNameObject name (HHMMSSss+DDMMSSs)meta.id;meta.maincharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainClusterCluster name (1)meta.id.parentcharGratingInstrument grating (HR15N or U580)meta.id;instrcharTeffEffective temperatureKphys.temperature.effectiveintlogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg? Error on logglog(cm.s**-2)stat.errorfloatnullable[Fe/H]Iron abundancephys.abund.Fefloate_[Fe/H]Error on [Fe/H]stat.error;phys.abund.FefloatEW(Li)Equivalent width of the lithium line at 6707.8{AA}0.1pmspect.line.eqWidthfloate_EW(Li)Error on EW(Li)0.1pmstat.errorfloatgamma? gamma indexspect.indexfloatnullablee_gamma? Error on gammastat.errorfloatnullable