J/ApJ/847/142ivo://CDS.VizieR/J/ApJ/847/142doi:10.26093/cds/vizier.18470142CDSEzzeddine R.Frebel A.Plez B.2018-09-25T13:19:40Z2018-07-06T11:19:33ZCDS support team

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

cds-question@unistra.frmetallicitychemically-peculiar-starsline-intensitiesastronomical-modelsWe present new ultra-metal-poor stars parameters with [Fe/H] < -4.0 based on line-by-line non-local thermodynamic equilibrium (NLTE) abundances using an up-to-date iron model atom with a new recipe for non-elastic hydrogen collision rates. We study the departures from LTE in their atmospheric parameters and show that they can grow up to ~1.00dex in [Fe/H], ~150K in Teff and ~0.5dex in logg toward the lowest metallicities. Accurate NLTE atmospheric stellar parameters, in particular [Fe/H] being significantly higher, are the first step to eventually providing full NLTE abundance patterns that can be compared with Population III supernova nucleosynthesis yields to derive properties of the first stars. Overall, this maximizes the potential of these likely second-generation stars to investigate the early universe and how the chemical elements were formed.2017ApJ...847..142Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/847/142CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992)J/A+A/275/101 : Chemical evolution of the galactic disk I. (Edvardsson+ 1993)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/ApJ/762/25 : The most metal-poor stars in HES and SDSS. I. (Norris+, 2013)J/A+A/572/A103 : Inelastic silicon-hydrogen collision data (Belyaev+, 2014)J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/A+A/579/A28 : Abundances of 3 CEMP stars (Bonifacio+, 2015)J/ApJS/216/1 : New FeI level energies from stellar spectra (Peterson+, 2015)J/A+A/587/A114 : Inelastic calcium-hydrogen collision data (Belyaev+, 2016)J/A+A/586/A120 : Grid of 1D models for Mg line formation (Osorio+, 2016)J/A+A/593/A27 : Inelastic beryllium-hydrogen collision data (Yakovleva+, 2016)J/ApJ/833/225 : -2.6<=[Fe/H]<=0.2 F and G dwarfs. II. Abundances (Zhao+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/847/142https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/847/142http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/847/142https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/847/142https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/847/142http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/847/142GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/847/142/table3 (*Our results for the average FeI, FeII, and total Fe abundances with their standard deviation errors)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/847/142/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/847/142/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/847/142/table3?GETtext/xml+votable180.050000true332.3530997-0.48328780.0055555555555555566/2067 17730 18719 19023 25832 25887 26200 27444 27644 27846 32555 33192 34069 34844 35009 35532 44016 45913 46283 48286https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/847/142?format=asciidefaultJ/ApJ/847/142/table3*Our results for the average FeI, FeII, and total Fe abundances with their standard deviation errorsSimbadNameSimbad column added by the CDSmeta.idcharf_Name[bc] Flag on Name (2)meta.codecharNameStar namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroup[1/3] Ultra-metal-poor star group (1)meta.codeintNlNumber of atomic linelists for this star (link to table 1)meta.numberintnullablel_[FeI/H]Limit flag on [FeI/H]meta.code.error;phys.abundchar[FeI/H]LTE FeI abundancelog(Sun)phys.abundfloate_[FeI/H][0.07/0.3]? Uncertainty on [FeI/H]log(Sun)stat.error;phys.abundfloatnullablel_[FeII/H]Limit flag on [FeI/H]meta.code.error;phys.abundchar[FeII/H]? LTE FeII abundancelog(Sun)phys.abundfloatnullablee_[FeII/H][0.08/0.2]? Uncertainty on [FeII/H]log(Sun)stat.error;phys.abundfloatnullablel_[FeI/H]nLimit flag on [FeI/H]meta.code.error;phys.abundchar[FeI/H]nnon-LTE FeI abundancelog(Sun)phys.abund.Fefloate_[FeI/H]n[0.03/0.2]? Uncertainty on [FeI/H]nlog(Sun)stat.error;phys.abundfloatnullablel_[FeII/H]nLimit flag on [FeI/H]meta.code.error;phys.abundchar[FeII/H]n? non-LTE FeII abundancelog(Sun)phys.abund.Fefloatnullablee_[FeII/H]n[0.07/0.2]? Uncertainty on [FeII/H]nlog(Sun)stat.error;phys.abundfloatnullablel_[Fe/H]Limit flag on [FeI/H]meta.code.error;phys.abund.Fechar[Fe/H]LTE total Fe abundancelog(Sun)phys.abund.Fefloate_[Fe/H][0.07/0.3]? Uncertainty on [Fe/H]log(Sun)stat.error;phys.abund.Fefloatnullablel_[Fe/H]nLimit flag on [FeI/H]meta.code.error;phys.abund.Fechar[Fe/H]nnon-LTE total Fe abundancelog(Sun)phys.abund.Fefloate_[Fe/H]n[0.03/0.2]? Uncertainty on [Fe/H]nlog(Sun)stat.error;phys.abund.FefloatnullableNFeINumber of FeI lines usedmeta.numberintn_NFeIa: No line detection, upper limit onlymeta.notecharNFeIINumber of FeII lines usedmeta.numberintn_NFeIIa: No line detection, upper limit onlymeta.notechar_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/ApJ/847/142/table1Atomic linelists and obtained FeI and FeII abundances of the ultra-metal-poor starsIonSpecies identifierphys.atmol.ionStagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharlambda[3255.8/5586.8] Wavelength {lambda}; in Angstroms unit0.1nmem.wldoubleExPot[0/4.4] Excitation potentialeVphys.atmol.excitationfloatlog(gf)[-4.8/0.7] Log of the oscillator strengthphys.atmol.oscStrengthfloatl_EWLimit flag on EWmeta.code.error;spect.line.eqWidthcharEW[0.8/143] Equivalent width of line, in milli-Angstroms unit1e-13mmeta.unit;spect.line.eqWidthfloatl_logeLTELimit flag on loge-LTEmeta.code.errorcharlogeLTE[0.2/4.1] log{epsilon} abundance of line, LTEphys.abundfloatl_logeNLTELimit flag on loge-NLTEmeta.code.errorcharlogeNLTE[0.9/4.7] log{epsilon} abundance of line, NLTEphys.abundfloat