J/A+A/622/L4ivo://CDS.VizieR/J/A+A/622/L4doi:10.26093/cds/vizier.36229004CDSAmarsi A.M.Nissen P.E.Asplund M.Lind K.Barklem P.S.2019-02-01T11:33:24Z2019-01-28T07:59:23ZCDS support team

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

cds-question@unistra.frlate-type-starschemically-peculiar-starschemical-abundancesline-intensitiesCarbon and oxygen are key tracers of the Galactic chemical evolution; in particular, a reported upturn in [C/O] towards decreasing [O/H] in metal-poor halo stars could be a signature of nucleosynthesis by massive Population III stars. We reanalyse carbon, oxygen, and iron abundances in 39 metal-poor turn-off stars. For the first time, we take into account 3D hydrodynamic effects together with departures from local thermodynamic equilibrium (LTE) when determining both the stellar parameters and the elemental abundances, by deriving effective temperatures from 3D non-LTE H{beta} profiles, surface gravities from Gaia parallaxes, iron abundances from 3D LTE FeII equivalent widths, and carbon and oxygen abundances from 3D non-LTE CI and OI equivalent widths. We find that [C/Fe] stays flat with [Fe/H], whereas [O/Fe] increases linearly up to 0.75dex with decreasing [Fe/H] down to -3.0dex. Therefore [C/O] monotonically decreases towards decreasing [C/H], in contrast to previous findings, mainly because the non-LTE effects for OI at low [Fe/H] are weaker with our improved calculations.2019A&A...622L...4Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/622/L4CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/425/671 : Equivalent widths of 10 metal-poor halo stars (Bai+, 2004)J/ApJ/658/367 : Abundances of carbon stars in Galactic halo (Komiya+, 2007)J/ApJ/711/573 : Detailed abundances in a halo stellar stream (Roederer+, 2010)J/ApJ/762/26 : Most metal-poor stars. II. 190 Galactic halo stars (Yong+ 2013)J/ApJ/788/180 : Very metal-poor stars in the Milky Way's halo (Carollo+, 2014)J/A+A/593/A28 : Halo metal-poor stars chemical data (Fernandez-Alvar+, 2016)J/A+A/608/A89 : Very metal poor stars in MW halo (Mashonkina+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/622/L4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/622/L4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/622/L4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/622/L4https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/622/L4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/622/L4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/622/L4/table1 (Stellar parameters/abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/622/L4/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/622/L4/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/622/L4/table1?GETtext/xml+votable180.050000true176.7110528-14.11207060.0055555555555555566/146 4376 8999 12451 12621 12645 13020 14385 16935 18887 19347 25385 25554 25891 25948 26025 26284 26289 27330 27394 27857 28154 30051 30179 30296 31094 36840 41259 42331 43575 44542 46302 46828 47347 47389 47512 47530 48281 48719 48736https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/622/L4?format=asciidefaultJ/A+A/622/L4/table1Stellar parameters/abundancesSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.idcharTeffEffective temperatureKphys.temperature.effectiveintloggLog10 surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Iron abundance wrt Sunlog(Sun)phys.abundfloatVMAGAbsolute visual magnitudemagphys.magAbs;em.opt.VfloatMassStellar masssolMassphys.massfloat[C/Fe]3N3D NLTE carbon to iron ratiophys.abundfloat[O/Fe]3N3D NLTE oxygen to iron ratiophys.abundfloat[C/Fe]3L3D LTE carbon to iron ratiophys.abundfloat[O/Fe]3L3D LTE carbon to iron ratiophys.abundfloat[C/Fe]1N1D NLTE carbon to iron ratiophys.abundfloat[O/Fe]1N1D NLTE oxygen to iron ratiophys.abundfloat[C/Fe]1L1D LTE carbon to iron ratiophys.abundfloat[O/Fe]1L1D LTE carbon to iron ratiophys.abundfloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/622/L4/table2Line-by-line FeII widths/abundancesStarStar namemeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEW412.87nm? Equivalent width 412.87nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D412.87nm? 3D LTE [Fe/H] 412.87nmphys.abund.FefloatnullableEW417.89nm? Equivalent width 417.89nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D417.89nm? 3D LTE [Fe/H] 417.89nmphys.abund.FefloatnullableEW423.32nmEquivalent width 423.32nmpmspect.line.eqWidth;em.opt.Bfloat3D423.32nm3D LTE [Fe/H] 423.32nmphys.abund.FefloatEW441.68nm? Equivalent width 441.68nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D441.68nm? 3D LTE [Fe/H] 441.68nmphys.abund.FefloatnullableEW448.92nm? Equivalent width 448.92nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D448.92nm? 3D LTE [Fe/H] 448.92nmphys.abund.FefloatnullableEW449.14nm? Equivalent width 449.14nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D449.14nm? 3D LTE [Fe/H] 449.14nmphys.abund.FefloatnullableEW450.83nm? Equivalent width 450.83nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D450.83nm? 3D LTE [Fe/H] 450.83nmphys.abund.FefloatnullableEW451.53nm? Equivalent width 451.53nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D451.53nm? 3D LTE [Fe/H] 451.53nmphys.abund.FefloatnullableEW452.02nm? Equivalent width 452.02nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D452.02nm? 3D LTE [Fe/H] 452.02nmphys.abund.FefloatnullableEW452.26nm? Equivalent width 452.26nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D452.26nm? 3D LTE [Fe/H] 452.26nmphys.abund.FefloatnullableEW454.15nm? Equivalent width 454.15nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D454.15nm? 3D LTE [Fe/H] 454.15nmphys.abund.FefloatnullableEW455.59nm? Equivalent width 455.59nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D455.59nm? 3D LTE [Fe/H] 455.59nmphys.abund.FefloatnullableEW457.63nm? Equivalent width 457.63nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D457.63nm? 3D LTE [Fe/H] 457.63nmphys.abund.FefloatnullableEW458.28nm? Equivalent width 458.28nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D458.28nm? 3D LTE [Fe/H] 458.28nmphys.abund.FefloatnullableEW458.38nm? Equivalent width 458.38nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D458.38nm? 3D LTE [Fe/H] 458.38nmphys.abund.FefloatnullableEW462.05nm? Equivalent width 462.05nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D462.05nm? 3D LTE [Fe/H] 462.05nmphys.abund.FefloatnullableEW465.70nm? Equivalent width 465.70nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D465.70nm? 3D LTE [Fe/H] 465.70nmphys.abund.FefloatnullableEW466.67nm? Equivalent width 466.67nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D466.67nm? 3D LTE [Fe/H] 466.67nmphys.abund.FefloatnullableEW492.39nm? Equivalent width 492.39nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D492.39nm? 3D LTE [Fe/H] 492.39nmphys.abund.FefloatnullableEW499.33nm? Equivalent width 499.33nmpmspect.line.eqWidth;em.opt.Bfloatnullable3D499.33nm? 3D LTE [Fe/H] 499.33nmphys.abund.FefloatnullableEW510.07nm? Equivalent width 510.07nmpmspect.line.eqWidth;em.opt.Vfloatnullable3D510.07nm? 3D LTE [Fe/H] 510.07nmphys.abund.FefloatnullableEW519.76nm? Equivalent width 519.76nmpmspect.line.eqWidth;em.opt.Vfloatnullable3D519.76nm? 3D LTE [Fe/H] 519.76nmphys.abund.FefloatnullableEW523.46nm? Equivalent width 523.46nmpmspect.line.eqWidth;em.opt.Vfloatnullable3D523.46nm? 3D LTE [Fe/H] 523.46nmphys.abund.FefloatnullableEW532.56nm? Equivalent width 532.56nmpmspect.line.eqWidth;em.opt.Vfloatnullable3D532.56nm? 3D LTE [Fe/H] 532.56nmphys.abund.FefloatnullableEW541.41nm? Equivalent width 541.41nmpmspect.line.eqWidth;em.opt.Vfloatnullable3D541.41nm? 3D LTE [Fe/H] 541.41nmphys.abund.FefloatnullableEW542.52nm? Equivalent width 542.52nmpmspect.line.eqWidth;em.opt.Vfloatnullable3D542.52nm? 3D LTE [Fe/H] 542.52nmphys.abund.FefloatnullableEW608.41nm? Equivalent width 608.41nmpmspect.line.eqWidth;em.opt.Rfloatnullable3D608.41nm? 3D LTE [Fe/H] 608.41nmphys.abund.FefloatnullableEW614.92nm? Equivalent width 614.92nmpmspect.line.eqWidth;em.opt.Rfloatnullable3D614.92nm? 3D LTE [Fe/H] 614.92nmphys.abund.FefloatnullableEW624.76nm? Equivalent width 624.76nmpmspect.line.eqWidth;em.opt.Rfloatnullable3D624.76nm? 3D LTE [Fe/H] 624.76nmphys.abund.FefloatnullableEW641.69nm? Equivalent width 641.69nmpmspect.line.eqWidth;em.opt.Rfloatnullable3D641.69nm? 3D LTE [Fe/H] 641.69nmphys.abund.FefloatnullableEW643.27nm? Equivalent width 643.27nmpmspect.line.eqWidth;em.opt.Rfloatnullable3D643.27nm? 3D LTE [Fe/H] 643.27nmphys.abund.FefloatnullableEW645.64nm? Equivalent width 645.64nmpmspect.line.eqWidth;em.opt.Rfloatnullable3D645.64nm? 3D LTE [Fe/H] 645.64nmphys.abund.FefloatnullableJ/A+A/622/L4/table3Line-by-line CI widths/abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.idcharEW906.1nm? Equivalent width 906.1nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N906.1nm? 3D NLTE [C/Fe] 906.1nmphys.abundfloatnullable3L906.1nm? 3D LTE [C/Fe] 906.1nmphys.abundfloatnullable1N906.1nm? 1D NLTE [C/Fe] 906.1nmphys.abundfloatnullable1L906.1nm? 1D LTE [C/Fe] 906.1nmphys.abundfloatnullableEW906.2nm? Equivalent width 906.2nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N906.2nm? 3D NLTE [C/Fe] 906.2nmphys.abundfloatnullable3L906.2nm? 3D LTE [C/Fe] 906.2nmphys.abundfloatnullable1N906.2nm? 1D NLTE [C/Fe] 906.2nmphys.abundfloatnullable1L906.2nm? 1D LTE [C/Fe] 906.2nmphys.abundfloatnullableEW907.8nm? Equivalent width 907.8nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N907.8nm? 3D NLTE [C/Fe] 907.8nmphys.abundfloatnullable3L907.8nm? 3D LTE [C/Fe] 907.8nmphys.abundfloatnullable1N907.8nm? 1D NLTE [C/Fe] 907.8nmphys.abundfloatnullable1L907.8nm? 1D LTE [C/Fe] 907.8nmphys.abundfloatnullableEW908.9nm? Equivalent width 908.9nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N908.9nm? 3D NLTE [C/Fe] 908.9nmphys.abundfloatnullable3L908.9nm? 3D LTE [C/Fe] 908.9nmphys.abundfloatnullable1N908.9nm? 1D NLTE [C/Fe] 908.9nmphys.abundfloatnullable1L908.9nm? 1D LTE [C/Fe] 908.9nmphys.abundfloatnullableEW909.5nm? Equivalent width 909.5nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N909.5nm? 3D NLTE [C/Fe] 909.5nmphys.abundfloatnullable3L909.5nm? 3D LTE [C/Fe] 909.5nmphys.abundfloatnullable1N909.5nm? 1D NLTE [C/Fe] 909.5nmphys.abundfloatnullable1L909.5nm? 1D LTE [C/Fe] 909.5nmphys.abundfloatnullableEW911.2nm? Equivalent width 911.2nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N911.2nm? 3D NLTE [C/Fe] 911.2nmphys.abundfloatnullable3L911.2nm? 3D LTE [C/Fe] 911.2nmphys.abundfloatnullable1N911.2nm? 1D NLTE [C/Fe] 911.2nmphys.abundfloatnullable1L911.2nm? 1D LTE [C/Fe] 911.2nmphys.abundfloatnullableEW940.6nm? Equivalent width 940.6nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N940.6nm? 3D NLTE [C/Fe] 940.6nmphys.abundfloatnullable3L940.6nm? 3D LTE [C/Fe] 940.6nmphys.abundfloatnullable1N940.6nm? 1D NLTE [C/Fe] 940.6nmphys.abundfloatnullable1L940.6nm? 1D LTE [C/Fe] 940.6nmphys.abundfloatnullableJ/A+A/622/L4/table4Line-by-line OI widths/abundancesStarStar namemeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEW777.2nm? Equivalent width 777.2nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N777.2nm? 3D NLTE [O/Fe] 777.2nmphys.abundfloatnullable3L777.2nm? 3D LTE [O/Fe] 777.2nmphys.abundfloatnullable1N777.2nm? 1D NLTE [O/Fe] 777.2nmphys.abundfloatnullable1L777.2nm? 1D LTE [O/Fe] 777.2nmphys.abundfloatnullableEW777.4nm? Equivalent width 777.4nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N777.4nm? 3D NLTE [O/Fe] 777.4nmphys.abundfloatnullable3L777.4nm? 3D LTE [O/Fe] 777.4nmphys.abundfloatnullable1N777.4nm? 1D NLTE [O/Fe] 777.4nmphys.abundfloatnullable1L777.4nm? 1D LTE [O/Fe] 777.4nmphys.abundfloatnullableEW777.5nm? Equivalent width 777.5nmpmspect.line.eqWidth;em.opt.Ifloatnullable3N777.5nm? 3D NLTE [O/Fe] 777.5nmphys.abundfloatnullable3L777.5nm? 3D LTE [O/Fe] 777.5nmphys.abundfloatnullable1N777.5nm? 1D NLTE [O/Fe] 777.5nmphys.abundfloatnullable1L777.5nm? 1D LTE [O/Fe] 777.5nmphys.abundfloatnullable