J/A+A/572/A33ivo://CDS.VizieR/J/A+A/572/A33doi:10.26093/cds/vizier.35720033CDSMikolaitis S.Hill V.Recio-Blanco A.de Laverny P.Allende Prieto C.,Kordopatis G.Tautvaisiene G.Romano D.Gilmore G.Randich S.,Feltzing S.Micela G.Vallenari A.Alfaro E.J.Bensby T.Bragaglia A.,Flaccomio E.Lanzafame A.C.Pancino E.Smiljanic R.Bergemann M.,Carraro G.Costado M.T.Damiani F.Hourihane A.Jofre P.Lardo C.,Magrini L.Maiorca E.Morbidelli L.Sbordone L.Sousa S.G.Worley C.C.,Zaggia S.2015-04-28T17:36:09Z2014-11-25T07:21:41ZCDS support team

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

cds-question@unistra.frspectroscopychemical-abundancesMost high-resolution spectroscopic studies of the Galactic discs were mostly confined to objects in the solar vicinity. Here we aim at enlarging the volume in which individual chemical abundances are used to characterise both discs, using the first internal data release of the Gaia-ESO survey. We derive and discuss the abundances of eight elements (Mg, Al, Si, Ca, Ti, Fe, Cr, Ni, and Y). The trends of these elemental abundances with iron are very similar to those in the solar neighbourhood. We find a natural division between {alpha}-rich and {alpha}-poor stars, best seen in the bimodality of the [Mg/M] distributions in bins of metallicity, which we attribute to thick- and thin-disc sequences, respectively. With the possible exception of Al, the observed dispersion around the trends is well described by the expected errors, leaving little room for astrophysical dispersion. Using previously derived distances from Recio-Blanco et al. (2014A&A...567A...5R), we further find that the thick-disc is more extended vertically and is more centrally concentrated towards the inner Galaxy than the thin-disc, which indicates a shorter scale-length. We derive the radial and vertical gradients in metallicity, iron, four {alpha}-element abundances, and Al for the two populations, taking into account the identified correlation between R_GC_ and |Z|. Radial metallicity gradient is found in the thin disc. The positive radial individual [{alpha}/M] gradients found are at variance from the gradients observed in the RAVE survey. The thin disc also hosts a negative vertical metallicity gradient, accompanied by positive individual [{alpha}/M] and [Al/M] gradients. The thick-disc, presents no radial metallicity gradient, a shallower vertical metallicity gradient than the thin-disc, an {alpha}-elements-to-iron radial gradient in the opposite sense than that of the thin disc, and positive vertical individual [{alpha}/M] and [Al/M] gradients.2014A&A...572A..33Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/572/A33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/324 : The Initial Gaia Source List (IGSL) (Smart, 2013)J/MNRAS/426/1767 : Gaia spectrophotometric standard stars I. (Pancino+, 2012)J/A+A/552/A64 : Gaia-RVS standards (Soubiran+, 2013)J/A+A/566/A98 : The Gaia Benchmark Stars - Library (Blanco-Cuaresma+, 2014)J/A+A/565/A11 : Gaia photometry for white dwarfs (Carrasco+, 2014)J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/572/A33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/572/A33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/572/A33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/572/A33https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/572/A33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/572/A33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/572/A33/table2 (Abundances of 1916 stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/572/A33/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/572/A33/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/572/A33/table2?GETtext/xml+votable180.050000true4.777375-47.03544440.0055555555555555566/17401 17403 17741 17748-17749 17826-17827 18974 18996 19079 19104 21594-21595 21617 21912-21913 22078-22079 22097 22099-22100 22102 23123 23126 23188-23189 23191 24576 25074 25512-25513 25536 25688-25689 25827 25830 25880 25882 26112 27288 31016-31017 33751 34334 34434 35031 35102 35202 35356 35358 35373 35387 35473 38297 38299-38300 38302 38502-38503 38508-38509 39503 39525 42337 42340 42601 42603-42604 42606 43349 43417 43419 43422 43605 43611 43623 43675 43692 43776 43778 44032 44034 44863 44906 46037-46039 46059 46295 46363 46366 46466 47388 47390 47425 49141https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/572/A33?format=asciiOpticaldefaultJ/A+A/572/A33/table2Abundances of 1916 starse_A(Ca1)? rms uncertainty of Ca1 abundancestat.errorfloatnullableID[1/1916] Identification numbermeta.id;meta.mainintprimaryCNameTarget Name in the Gaia-ESO archive, HHMMSSss+DDMMSSsmeta.idcharNameObject Name in the Gaia-ESO archivemeta.idcharA(Mg1)[6.0/8.0]? MgI abundance, 12+log(N/H)phys.abundfloatnullablee_A(Mg1)? rms uncertainty of Mg1 abundancestat.errorfloatnullableA(Al1)[5.2/7.0]? AlI abundance, 12+log(N/H)phys.abundfloatnullablee_A(Al1)? rms uncertainty of Al1 abundancestat.errorfloatnullableA(Si1)[5.9/8.2]? SiI abundance, 12+log(N/H)phys.abundfloatnullablee_A(Si1)? rms uncertainty of Si1 abundancestat.errorfloatnullableA(Ca1)[3.7/6.9]? CaI abundance, 12+log(N/H)phys.abundfloatnullableA(Ca2)[3.7/6.8]? CaII abundance, 12+log(N/H)phys.abundfloatnullablee_A(Ca2)? rms uncertainty of Ca2 abundancestat.errorfloatnullableA(Ti1)[3.2/5.4]? TiI abundance, 12+log(N/H)phys.abundfloatnullablee_A(Ti1)? rms uncertainty of Ti1 abundancestat.errorfloatnullableA(Ti2)[3.4/5.6]? TiII abundance, 12+log(N/H)phys.abundfloatnullablee_A(Ti2)? rms uncertainty of Ti2 abundancestat.errorfloatnullableA(Cr1)[2.8/6.1]? CrI abundance, 12+log(N/H)phys.abundfloatnullablee_A(Cr1)? rms uncertainty of Cr1 abundancestat.errorfloatnullableA(Ni1)[4.5/6.9]? NiI abundance, 12+log(N/H)phys.abundfloatnullablee_A(Ni1)? rms uncertainty of Ni1 abundancestat.errorfloatnullableA(Y2)[-0.2/3]? YII abundance, 12+log(N/H)phys.abundfloatnullablee_A(Y2)? rms uncertainty of Y2 abundancestat.errorfloatnullable_RAPositiom from Name (right ascension part)degpos.eq.ra;meta.main_DEPositiom from Name (declination part)degpos.eq.dec;meta.main