J/ApJ/953/31ivo://CDS.VizieR/J/ApJ/953/31doi:10.26093/cds/vizier/ba-xs-zCDSSneden C.Boesgaard A.M.Cowan J.J.Roederer I.U.Den Hartog E.A.,Lawler J.E.2026-07-02T12:00:20Z2025-10-31T09:27:18ZCDS support team

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

cds-question@unistra.frchemical-abundanceschemically-peculiar-starsvisible-astronomyspectroscopyultraviolet-astronomyWe have derived new detailed abundances of Mg, Ca, and the Fe-group elements Sc through Zn (Z=21-30) for 37 main-sequence turnoff very metal-poor stars ([Fe/H]<~-2.1). We analyzed Keck HIRES optical and near-UV high signal-to-noise spectra originally gathered for a Be abundance survey. Using typically ~400 Fe-group lines with accurate laboratory transition probabilities for each star, we have determined accurate LTE metallicities and abundance ratios for neutral and ionized species of the 10 Fe-group elements as well as {alpha} elements Mg and Ca. We find good neutral/ion abundance agreement for the six elements that have detectable transitions of both species in our stars in the 3100-5800{AA} range. Earlier reports of correlated Sc-Ti-V relative overabundances are confirmed, and appear to slowly increase with decreasing metallicity. To this element trio we add Zn; it also appears to be increasingly overabundant in the lowest-metallicity regimes. Co appears to mimic the behavior of Zn, but issues surrounding its abundance reliability cloud its interpretation.2023ApJ...953...31Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/953/31CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/ApJ/667/1267 : CrI transition probabilities (Sobeck+, 2007)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/ApJS/182/51 : Transition prob. of rare earth elements (Lawler+, 2009)J/ApJS/182/80 : Rare earth abundances (Sneden+, 2009)J/ApJ/743/140 : Abund. (Be,{alpha}) in metal-poor stars (Boesgaard+, 2011)J/ApJS/194/35 : Atomic transition probabilities of Mn (Den Hartog+, 2011)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/ApJS/208/27 : Sun and HD 84937 TiII log(gf) and abundances (Wood+, 2013)J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)J/ApJS/215/23 : FeI radiative lifetimes (Den Hartog+, 2014)J/ApJS/215/20 : Vanadium log(gf) & transition probabilities (Lawler+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/MNRAS/441/3127 : FeI oscillator strengths for Gaia-ESO (Ruffoni+, 2014)J/ApJS/214/18 : VII log(gf) values, and V abundance in HD 84937 (Wood+ 2014)J/ApJS/211/20 : NiI transition probability measurements (Wood+, 2014)J/ApJS/220/13 : Co I transition probabilities (Lawler+, 2015)J/ApJ/817/53 : Fe-group elemental abundances in HD84937 (Sneden+, 2016)J/ApJS/228/10 : Transition prob. for 183 lines of Cr II (Lawler+, 2017)J/A+A/615/A151 : Lithium abund. in 714 F and G dwarf stars (Bensby+, 2018)J/ApJ/857/2 : Abundances in 6 metal-poor stars (Roederer+, 2018)J/ApJS/234/25 : Vanadium transitions in the sp. of Arcturus (Wood+, 2018)J/ApJ/870/2 : PUSH. III. Nucleosynthesis yields (Curtis+, 2019)J/ApJ/890/119 : Iron abund. in 3 very metal-poor stars (Cowan+, 2020)J/ApJ/900/106 : Vanadium abundances for 255 metal-poor stars (Ou+, 2020)J/ApJ/907/10 : Initial vs final sample of VMP HK/HES stars (Limberg+, 2021)J/ApJ/931/147 : Very metal-poor stars with LAMOST & Subaru. II. (Li+, 2022)J/ApJS/260/27 : R-Process Alliance: UV sp. of HD 222925 (Roederer+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/953/31https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/953/31http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/953/31https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/953/31https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/953/31http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/953/31GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/953/31/table1 (Model atmosphere parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/953/31/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/953/31/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/953/31/table1?GETtext/xml+votable180.050000true205.0103842-0.03854170.0055555555555555566/146 4184 4714 5622 6159 6186 8999 9505 11419 12645 16935 17509 19100 19903 22093 23011 25385 25554 25891 26025 27330 27659 27948 29753 30051 30464 31094 31748 32034 32593 32743 36084 36729 36813 36840 48719 48937https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/953/31?format=asciiUVOpticaldefaultJ/ApJ/953/31/table1Model atmosphere parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryTeff[5500/6350] Effective temperatureKphys.temperature.effectiveintlogg[3.1/4.5] Log of surface gravitylog(cm.s**-2)phys.gravityfloatVt[1/1.5] Microturbulent velocity, {xi}_t_km/sphys.veloc.microTurbfloat[FeI/H][-3.6/-1.4] [Fe/H], FeI transitionSunphys.abund.Fe;phys.atmol.transitionfloate_[FeI/H][0.08/0.12] [FeI/H] uncertaintySunstat.error;phys.abund.FefloatNlFeI[85/288] Number of FeI lines usedmeta.numberint[FeII/H][-3.51/-1.44] [Fe/H], FeII transitionSunphys.abund.Fe;phys.atmol.transitionfloate_[FeII/H][0.08/0.16] [FeII/H] uncertaintySunstat.error;phys.abund.FefloatNlFeII[7/25] Number of FeII lines usedmeta.numberintB11Display data from Boesgaard+ 2011, J/ApJ/743/140meta.ref.urlcharAbundDisplay the abundances for this star (link to Table 2)meta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullable_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/953/31/table2Abundances for individual starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.mainchar[Fe/H][-3.56/-1.42] Metallicity (1)log(Sun)phys.abund.ZfloatSpeciesSpecies identifier (2)phys.atmol.ionStagechar[X/Fe][-0.92/0.7]? Abundance ratio of Species relative to ironlog(Sun)phys.abundfloatnullablee_[X/Fe][0/0.3]? Statistical uncertainty in [X/Fe]log(Sun)stat.error;phys.abundfloatnullableNl[1/112]? Number of Species linesmeta.numberintnullable