J/A+A/573/A55ivo://CDS.VizieR/J/A+A/573/A55doi:10.26093/cds/vizier.35730055CDSTautvaisiene G.Drazdauskas A.Mikolaitis S.Barisevicius G.,Puzeras E.Stonkute E.Chorniy Y.Magrini L.Romano D.Smiljanic R.,Bragaglia A.Carraro G.Friel E.Morel T.Pancino E.Donati P.,Jimenez-Esteban F.Gilmore G.Randich S.Jeffries R.D.Vallenari A.,Bensby T.Flaccomio E.Recio-Blanco A.Costado M.T.Hill V.Jofre P.,Lardo C.De Laverny P.Masseron T.Moribelli L.Sousa S.G.Zaggia S.2017-11-10T11:16:16Z2016-01-15T10:24:54ZCDS support team

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

cds-question@unistra.fropen-star-clustersradial-velocityThe Gaia-ESO Public Spectroscopic Survey will observe a large sample of clusters and cluster stars, covering a wide age-distance-metallicity-position-density parameter space. We aim to determine C, N, and O abundances in stars of Galactic open clusters of the Gaia-ESO survey and to compare the observed abundances with those predicted by current stellar and Galactic evolution models. In this pilot paper, we investigate the first three intermediate-age open clusters. High-resolution spectra, observed with the FLAMES-UVES spectrograph on the ESO VLT, were analysed using a differential model atmosphere method. Abundances of carbon were derived using the C_2_ band heads at 5135 and 5635.5{AA}. The wavelength interval 6470-6490{AA}, with CN features, was analysed to determine nitrogen abundances. Oxygen abundances were determined from the [OI] line at 6300{AA}. The mean values of the elemental abundances in Trumpler 20 as determined from 42 stars are: [Fe/H]=0.10+/-0.08 (s.d.), [C/H]=-0.10+/-0.07, [N/H]=0.50+/-0.07, and consequently C/N=0.98+/-0.12. We measure from five giants in NGC 4815: [Fe/H]=-0.01+/-0.04, [C/H]=-0.17+/-0.08, [N/H]=0.53+/-0.07, [O/H]=0.12+/-0.09, and C/N=0.79+/-0.08. We obtain from 27 giants in NGC 6705: [Fe/H]=0.0+/-0.05, [C/H]=-0.08+/-0.06, [N/H]=0.61+/-0.07, [O/H]=0.13+/-0.05, and C/N=0.83+/-0.19. The C/N ratios of stars in the investigated open clusters were compared with the ratios predicted by stellar evolutionary models. For the corresponding stellar turn-off masses from 1.9 to 3.3M_{sun}_, the observed C/N ratio values are very close to the predictions of standard first dredge-up models as well as to models of thermohaline extra-mixing. They are not decreased as much as predicted by the recent model in which the thermohaline- and rotation-induced extra-mixing act together. The average [O/H] abundance ratios of NGC 4815 and NGC 6705 are compared with the predictions of two Galactic chemical evolution models. The data are consistent with the evolution at the solar radius within the errors. The first results of CNO determinations in open clusters show the potential of the Gaia-ESO Survey to judge stellar and Galactic chemical evolution models and the validity of their physical assumptions through a homogeneous and detailed spectral analysis.2015A&A...573A..55Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/573/A55CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/310/982 : UBVI CCD Photometry of M11 - II. (Sung+ 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/573/A55https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/573/A55http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/573/A55https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/573/A55https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/573/A55http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/573/A55GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/573/A55/ngc4815 (Stellar parameters (table 2) and main atmospheric parameters and elemental abundances (table6) for target stars in NGC 4815)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/573/A55/ngc4815?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/573/A55/ngc4815?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/573/A55/ngc4815?GETtext/xml+votable180.050000true194.3518-64.92150.005555555555555556Cone search capability for table J/A+A/573/A55/trumpler20 (Stellar parameters (table 1) and main atmospheric parameters and elemental abundances (table5) for target stars in Trumpler 20)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/573/A55/trumpler20?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/573/A55/trumpler20?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/573/A55/trumpler20?GETtext/xml+votable180.050000true189.6498-60.75680.005555555555555556Cone search capability for table J/A+A/573/A55/ngc6705 (Stellar parameters (table 3) and main atmospheric parameters and elemental abundances (table7) for target stars in NGC 6705)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/573/A55/ngc6705?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/573/A55/ngc6705?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/573/A55/ngc6705?GETtext/xml+votable180.050000true282.618-6.25340.0055555555555555566/30215 41649 43034https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/573/A55?format=asciiOpticaldefaultJ/A+A/573/A55/ngc4815Stellar parameters (table 2) and main atmospheric parameters and elemental abundances (table6) for target stars in NGC 4815IDIdentification number from referencemeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/3] Reference (1)meta.ref;pos.frameintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatS/NSignal-to-noise ratiostat.snrintvinsiGGES database value of rotational velocitykm/sphys.veloc.rotatfloatvsiniRotational velocity determined in this workkm/sphys.veloc.rotatfloatGESGES designationmeta.id;meta.maincharn_GES[*] Note on GES (1)meta.notecharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulent velocitykm/sphys.velocfloat[Fe/H]Metallicity (2)phys.abund.Zfloat[C/H]Abundance [C/H] (2)phys.abundfloat[N/H]? Abundance [N/H] (2)phys.abundfloatnullable[O/H]? Abundance [O/H] (2)phys.abundfloatnullableC/N? Abundance C/N (2)phys.abundfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/573/A55/trumpler20Stellar parameters (table 1) and main atmospheric parameters and elemental abundances (table5) for target stars in Trumpler 20[Fe/H]Metallicity (2)phys.abund.ZfloatSimbadSimbad column added by the CDSmeta.ref.urlchar[C/H]Abundance [C/H] (2)phys.abundfloat[N/H]? Abundance [N/H] (2)phys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/3] Reference (1)meta.ref;pos.frameintIDIdentification number from referencemeta.idintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatS/NSignal-to-noise ratiostat.snrintvinsiGGES database value of rotational velocitykm/sphys.veloc.rotatfloatvsiniRotational velocity determined in this workkm/sphys.veloc.rotatfloatGESGES designationmeta.id;meta.maincharn_GES[*] Note on GES (1)meta.notecharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulent velocitykm/sphys.velocfloat[O/H]? Abundance [O/H] (2)phys.abundfloatnullableC/N? Abundance C/N (2)phys.abundfloatnullableJ/A+A/573/A55/ngc6705Stellar parameters (table 3) and main atmospheric parameters and elemental abundances (table7) for target stars in NGC 6705[Fe/H]Metallicity (2)phys.abund.ZfloatS/NSignal-to-noise ratiostat.snrintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/3] Reference (1)meta.ref;pos.frameintIDIdentification number from referencemeta.idintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatB-V? B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-I? V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableRVRadial velocitykm/sphys.veloc;pos.heliocentricfloatvinsiGGES database value of rotational velocitykm/sphys.veloc.rotatfloatvsiniRotational velocity determined in this workkm/sphys.veloc.rotatfloatGESGES designationmeta.id;meta.maincharn_GES[*] Note on GES (1)meta.notecharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulent velocitykm/sphys.velocfloat[C/H]Abundance [C/H] (2)phys.abundfloat[N/H]? Abundance [N/H] (2)phys.abundfloatnullable[O/H]? Abundance [O/H] (2)phys.abundfloatnullableC/N? Abundance C/N (2)phys.abundfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar