J/A+A/522/A26ivo://CDS.VizieR/J/A+A/522/A26doi:10.26093/cds/vizier.35220026CDSSbordone L.Bonifacio P.Caffau E.Ludwig H.-G.Behara N. T.,Gonzalez Hernandez J.I.Steffen M.Cayrel R.Freytag B.,Van't Veer C.Molaro P.Plez B.Sivarani T.Spite M.Spite F.,Beers T.C.Christlieb N.Francois P.Hill V.2017-06-20T13:16:29Z2010-10-28T08:13:15ZCDS support team

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

cds-question@unistra.frmetallicitychemically-peculiar-starspopulation-ii-starsThe determination of Lithium abundance A(Li) is extremely sensitive to the adopted temperature scale, so that a Teff bias might mimic a trend in A(Li). We present here VLT-UVES Li abundances for 28 halo dwarf stars between [Fe/H]=-2.5 and -3.5, 10 of which have [Fe/H]<-3. Four different Teff scales have been used: Direct Infrared Flux Method (IRFM) has been used on the basis of 2MASS infrared photometry; H{alpha} wings have been fitted against two synthetic grids computed by means of 1D LTE atmosphere models, and a grid of H{alpha} profiles computed by means of 3D hydrodynamical atmosphere models. As a result, we confirm previous claims that A(Li) does not exhibit a plateau below [Fe/H]=-3. A strong positive correlation with [Fe/H] appears, not influenced by the choice of the Teff estimator. From a linear fit, we obtain a strong slope of about 0.30 dex in A(Li) per dex in [Fe/H], significant to 2-3, and consistent within 1 among all the four Teff estimators. A significant slope is also detected in the A(Li)-Teff plane, driven mainly by the coolest stars in the sample (Teff<6250), which appear Li-poor. However, removing such stars does not alter significantly the behavior in the A(Li)-[Fe/H] plane. When the full sample is considered, the scatter in A(Li) increases by a factor of 2 towards lower metallicities, while the plateau appears very thin above [Fe/H]=-2.8. At this metallicity, the plateau lies at A(Li)3D,NLTE=2.199+/-0.086.2010A&A...522A..26Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/522/A26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/522/A26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/522/A26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/522/A26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/522/A26https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/522/A26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/522/A26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/522/A26/stars (Program stars: basic data and atmosphere parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/522/A26/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/522/A26/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/522/A26/stars?GETtext/xml+votable180.050000true210.227522.780.0055555555555555566/8930 16549 16587 16795 17788 19017 19239 19903 27176 31395 33515 34751 35527 35561 35579 35710 35731 35736 35775 44607 46565 46699 46871 47040 47231 48517 48526 48719 487668.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/522/A26?format=asciiOpticaldefaultJ/A+A/522/A26/starsProgram stars: basic data and atmosphere parametersTeff1? Effective temperature on the BA scaleKphys.temperature.effective;instr.scaleintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharprimarylogg1? Gravity on the BA scalelog(cm.s**-2)instr.scalefloatnullablexi1? Miroturbulence velocity on the BA scalekm/sphys.veloc.microTurbfloatnullable[Fe/H]1? Metallicity on the BA scalelog(Sun)instr.scalefloatnullableTeff2? Effective temperature on the ALI scaleKphys.temperature.effective;instr.scaleintnullablelogg2? Gravity on the ALI scalelog(cm.s**-2)instr.scalefloatnullablexi2? Miroturbulence velocity on the ALI scalekm/sphys.veloc.microTurbfloatnullable[Fe/H]2? Metallicity on the ALI scalelog(Sun)instr.scalefloatnullableTeff3? Effective temperature on the IRFM scaleKphys.temperature.effective;instr.scaleintnullablelogg3? Gravity on the IRFM scalelog(cm.s**-2)instr.scalefloatnullablexi3? Miroturbulence velocity on the IRFM scalekm/sphys.veloc.microTurbfloatnullable[Fe/H]3? Metallicity on the IRFM scalelog(Sun)instr.scalefloatnullableTeff4Effective temperature on the 3D scaleKphys.temperature.effective;instr.scaleintlogg4Gravity on the 3D scalelog(cm.s**-2)instr.scalefloatxi4Miroturbulence velocity on the 3D scalekm/sphys.veloc.microTurbfloat[Fe/H]4Metallicity on the 3D scalelog(Sun)instr.scalefloatVmag? V magnitudemagphot.mag;em.opt.VfloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.HfloatnullableKmag? 2MASS Ks magnitudemagphot.mag;em.IR.KfloatnullableE(B-V)? B-V color excessmagphot.color.excessfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharRAJ2000Right Ascension J2000pos.eq.ra;meta.mainDEJ2000Declination J2000pos.eq.dec;meta.mainJ/A+A/522/A26/table3FeI and FeII abundances of the program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar identificationmeta.id;meta.maincharIonFeI or FeII ionphys.atmol.ionStagecharlambdaLine wavelengthnmem.wl;spect.linedoubleloggfLine oscillator strengthspect.line.intensityfloatEWLine equivalent widthpmspect.line.eqWidthfloat3Dabu? Abundance, 3D parameters (G1) (1)phys.abundfloatnullableBAabu? Abundance, BA parameters (G1) (1)phys.abundfloatnullableALIabu? Abundance, ALI parameters (1) (G1)phys.abundfloatnullableIRFMabu? Abundance, IRFM parameters (1) (G1)phys.abundfloatnullable