J/ApJ/762/26ivo://CDS.VizieR/J/ApJ/762/26doi:10.26093/cds/vizier.17620026CDSYong D.Norris J.E.Bessell M.S.Christlieb N.Asplund M.Beers T.C.,Barklem P.S.Frebel A.Ryan S.G.2017-07-12T15:18:09Z2014-10-10T12:46:18ZCDS support team

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

cds-question@unistra.frchemical-abundanceshalo-starschemically-peculiar-starseffective-temperatureWe present a homogeneous chemical abundance analysis of 16 elements in 190 metal-poor Galactic halo stars (38 program and 152 literature objects). The sample includes 171 stars with [Fe/H]<=-2.5, of which 86 are extremely metal poor, [Fe/H]<=-3.0. Our program stars include 10 new objects with [Fe/H]<=-3.5. We identify a sample of "normal" metal-poor stars and measure the trends between [X/Fe] and [Fe/H], as well as the dispersion about the mean trend for this sample. Using this mean trend, we identify objects that are chemically peculiar relative to "normal" stars at the same metallicity. These chemically unusual stars include CEMP-no objects, one star with high [Si/Fe], another with high [Ba/Sr], and one with unusually low [X/Fe] for all elements heavier than Na. The Sr and Ba abundances indicate that there may be two nucleosynthetic processes at lowest metallicity that are distinct from the main r-process. Finally, for many elements, we find a significant trend between [X/Fe] versus T_eff_, which likely reflects non-LTE and/or three-dimensional effects. Such trends demonstrate that care must be exercised when using abundance measurements in metal-poor stars to constrain chemical evolution and/or nucleosynthesis predictions.2013ApJ...762...26Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/762/26CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/ApJ/762/27 : Pap. III: metallicity distribution function (Yong+, 2013)J/ApJ/762/25 : Pap. I: Discovery, data & atmospheric param. (Norris+, 2013)J/A+A/541/A143 : NLTE Corrections of the Ca lines (Spite+, 2012)J/ApJS/199/38 : Presupernova evolution (Limongi+, 2012)J/ApJ/742/54 : CASH project II. Extremely metal-poor stars (Hollek+, 2011)J/A+A/534/A136 : Halo red giants from the SEGUE survey (Martell+, 2011)J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)J/MNRAS/403/1413 : Updated stellar yields from AGB models (Karakas, 2010)J/ApJ/724/975 : Metal-poor stars heavy element abundances (Roederer+, 2010)J/ApJ/724/341 : Nucleosynthesis of massive metal-free stars (Heger+, 2010)J/ApJ/711/350 : Metal-poor giant Boo-1137 abundances (Norris+, 2010)J/A+A/513/A35 : Abundances of Galactic red giants (Alves-Brito+, 2010)J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)J/A+A/511/L10 : Abundances and space velocities of 94 stars (Nissen+, 2010)J/A+A/509/A93 : Carbon-enhanced metal-poor stars (Masseron+, 2010)J/A+A/503/545 : EWs of Li, Na, Fe, Ca in NGC 6397 (Lind+, 2009)J/A+A/503/541 : Late-type stars neutral Li non-LTE estimations (Lind+, 2009)J/A+A/501/519 : Extremely metal-poor stars abundances (Bonifacio+, 2009)J/AJ/137/272 : Space velocities orbits in the MW halo (Roederer+ 2009)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/ApJ/658/1203 : Nitrogen-enhanced metal-poor stars (Johnson+, 2007)J/ApJ/658/367 : Abundances of carbon stars in Galactic halo (Komiya+, 2007)J/ApJ/655/492 : Equivalent widths of 26 metal-poor stars (Aoki+, 2007)J/AJ/132/137 : Extremely metal-poor carbon stars abundances (Cohen+, 2006)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/A+A/420/183 : Spectro. survey in solar neighborhood (Allende Prieto+ 2004)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/MNRAS/340/304 : [X/Fe] of Galactic disc F and G dwarfs (Reddy+, 2003)J/A+A/326/751 : Chemical composition of halo and disk stars (Nissen+, 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/762/26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/762/26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/762/26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/762/26https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/762/26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/762/26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/762/26/stars (Model atmosphere parameters and chemical abundances for the 38 program stars (tables 1 and 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/762/26/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/762/26/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/762/26/stars?GETtext/xml+votable180.050000true139.70791737.7407780.005555555555555556Cone search capability for table J/ApJ/762/26/sample (Model atmosphere parameters and chemical abundances for the literature (152 stars) (tables 6 and 7))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/762/26/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/762/26/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/762/26/sample?GETtext/xml+votable180.050000true0.439583-5.8296110.005555555555555556Cone search capability for table J/ApJ/762/26/table9 (Model atmosphere parameters and chemical abundances, [X/Fe], for the complete (literature+program))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/762/26/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/762/26/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/762/26/table9?GETtext/xml+votable180.050000true0.439583-5.8296110.0055555555555555566/51 2067 4253 5406 5450 5723 5768 5775 6051 8197 8205 8228 8244 8266 8328 8766 8864 8930 10149 10173 10340 10430 10476 10921 11543 12793 16540 16549 16565 16587 16603 16654 16680 16716 16736 16773 16795 16821 16865 16880 16935 16984 17221 17233 17343 17357 17392 17420 17543 17545 17578 17598 17623 17642 17788 17850 18564 18579 18636 18637 18663 18683 18708 18719 18953 18973 19017 19070 19210 19211 19566 19602 19903 19968 21195 21198 22650 22662 23011 23240 24674 24918 25357 25385 25540 25574 25678 25719 25813 25887 25891 26198 26232 26457 26658 26941 27035 27048 28054 28097 28540 28594 30041 30891 30963 31377 31394 31395 31427 31585 31595 32302 32352 32468 33470 33515 33579 33642 34069 34513 34574 34751 34844 35009 35181 35524 35532 35561 35710 35731 35736 35768 35784 35803 35825 36084 36196 36280 36356 36503 36542 36583 36658 36705 36737 36789 36837 40319 40410 43926 44016 44542 44575 44990 45345 45470 45546 45694 45797 45808 45818 45825 45904 45913 45959 45969 46008 46565 46614 46699 46792 46796 46958 47063 47556 48221 48234 48286 48501 48517 48526 48534 48614 48625 48722 48734 48798 48824 48862 49078https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/762/26?format=asciidefaultJ/ApJ/762/26/starsModel atmosphere parameters and chemical abundances for the 38 program stars (tables 1 and 2)l_A(N)Limit flag on A(N)meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryf_Name[cd] assumed gravity (G1)meta.codecharRAJ20002MASS hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ20002MASS degree of declination (J2000)pos.eq.dec;meta.mainTeff[4430/6635]? Effective temperatureKphys.temperature.effectiveintnullablelogg[0.7/4.7]? log of surface gravitylog(cm.s**-2)phys.gravityfloatnullablexi[0.3/3.4]? Turbulent velocity ({xi}_t_)km/sphys.velocfloatnullable[M/H][-5.5/-1]? Model metallicity [M/H]phys.abund.Zfloatnullable[Fe/H][-5.8/-1]? Derived iron abundance [Fe/H]phys.abund.FefloatnullableC-rich[0/1]? Carbon-rich source code (0=C-normal) (G2)meta.codeintnullablel_A(C)Limit flag on A(C)meta.code.errorcharA(C)[4.5/8.3] C abundancephys.abundfloatl_[C/Fe]Limit flag on [C/Fe]meta.code.error;phys.abundchar[C/Fe][-0.27/2.82] [C/Fe] abundance ratiophys.abund;arith.ratiofloatA(N)[4.7/7.5]? N abundancephys.abundfloatnullablel_[N/Fe]Limit flag on [N/Fe]meta.code.error;phys.abundchar[N/Fe][0.42/2.91]? [N/Fe] abundance ratiophys.abund;arith.ratiofloatnullableADetails of the 16 abundances and their variationsphys.abundcharJ/ApJ/762/26/abundAbundances and errors for the program stars (tables 3 and 4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIon identificationphys.atmol.ionStagecharNameStar identifiermeta.id;meta.maincharf_Name[cd] assumed gravity (G1)meta.codecharl_A(X)Limit on A(X)meta.code.errorcharA(X)[-3.5/6.1]? Log abundance in Ionpos.cartesian.xfloatnullableo_A(X)[1/102]? Number of lines used to determine A(X)meta.numberintnullables_A(X)[0/0.6]? Standard error of the mean in A(X)stat.errorfloatnullablee_A(X)[0.08/0.6]? Total error in A(X) (1)stat.errorfloatnullablel_X/FeLimit flag on X/Femeta.code.error;phys.abundcharX/Fe[-4.1/2.2]? Log of the Ion/Fe abundancephys.abundfloatnullablef_X/Fe[efg] How X/Fe was determined (2)meta.codecharParamParameter identifiermeta.id;stat.paramDT[-0.1/0.2]? Abundance error from 100K changestat.errorfloatnullableDlogg[-0.2/0.2]? Abundance error from 0.3dex log(g) changestat.errorfloatnullableDxi[-0.2/0.03]? Abundance error from 0.3km/s {xi}_t_ changestat.errorfloatnullableDM/H[-0.2/0.2]? Abundance error from 0.3dex M/H changestat.errorfloatnullableDX/Fe[0.01/0.3]? Abundance error from 1dex [X/Fe] changestat.errorfloatnullableJ/ApJ/762/26/sampleModel atmosphere parameters and chemical abundances for the literature (152 stars) (tables 6 and 7)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namecharf_Name[cd] assumed gravity (G1)charRAJ20002MASS hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ20002MASS degree of declination (J2000)pos.eq.dec;meta.mainTeff[4430/6635]? Effective temperatureKintnullablelogg[0.7/4.7]? log of surface gravitylog(cm.s**-2)floatnullablexi[0.3/3.4]? Turbulent velocity ({xi}_t_)km/sfloatnullable[M/H][-5.5/-1]? Model metallicity [M/H]floatnullable[Fe/H][-5.8/-1]? Derived iron abundance [Fe/H]floatnullableC-rich[0/1]? Carbon-rich source code (0=C-normal) (G2)intnullableRefReference source codes (only for table 6) (G3)charl_C/FeLimit flag on C/FecharC/Fe[-0.8/4.3]? Log of the C/Fe abundance (1)floatnullablel_N/FeLimit flag on N/FecharN/Fe[-0.8/4.6]? Log of the N/Fe abundance (1)floatnullableNa/Fe[-0.4/2.5]? Log of the Na/Fe abundancefloatnullableMg/Fe? Log of the Mg/Fe abundancefloatnullableAl/Fe[-1.2/1.3]? Log of the Al/Fe abundancefloatnullableSi/Fe[-0.9/1]? Log of the Si/Fe abundancefloatnullableCa/Fe? Log of the Ca/Fe abundancefloatnullableSc/Fe? Log of the Sc/Fe abundancefloatnullableTiI/Fe? Log of the Ti I/Fe abundancefloatnullableTiII/Fe? Log of the Ti II/Fe abundancefloatnullableCr/Fe? Log of the Cr/Fe abundancefloatnullableMn/Fe[-1/0.2]? Log of the Mn/Fe abundancefloatnullableFeII/H[-4.2/-1.3]? Log of the FeII/H abundancefloatnullableCo/Fe? Log of the Co/Fe abundancefloatnullableNi/Fe? Log of the Ni/Fe abundancefloatnullableSr/Fe[-2.1/1.9]? Log of the Sr/Fe abundancefloatnullableBa/Fe[-2.1/2.7]? Log of the Ba/Fe abundancefloatnullableJ/ApJ/762/26/table9Model atmosphere parameters and chemical abundances, [X/Fe], for the complete (literature+program)SimbadNameSimbad column added by the CDSmeta.idcharNameStar identifiermeta.id;meta.maincharl_BaLimit flag on Bameta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_Name[cd] assumed gravity (G1)meta.codecharRAJ20002MASS Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ20002MASS Degree of Declination (J2000)pos.eq.dec;meta.mainTeff[4430/6635] Effective temperatureKphys.temperature.effectiveintlog(g)[0.7/4.7]? Log of the surface gravitylog(cm.s**-2)phys.gravityfloatnullableFe/H[-5.8/-1]? Log of the Fe/H abundancephys.abund.FefloatnullableC-rich[0/1]? Carbon rich source (0=C-normal) (G2)meta.codeintnullablel_CLimit flag on Cmeta.code.errorcharC[-0.8/4.3]? Log of the C abundance (1)phys.abundfloatnullablel_NLimit flag on Nmeta.code.errorcharN[-0.8/4.6]? Log of the N abundance (1)phys.abundfloatnullableNa[-0.5/2.5]? Log of the Na abundancephys.abundfloatnullableMg? Log of the Mg abundancephys.abundfloatnullableAl[-1.2/1.3]? Log of the Al abundancephys.abundfloatnullablel_SiLimit flag on Simeta.code.errorcharSi[-0.9/2]? Log of the Si abundancephys.abundfloatnullableCa? Log of the Ca abundancephys.abundfloatnullableSc? Log of the Sc abundancephys.abundfloatnullableTiI? Log of the Ti I abundancephys.abundfloatnullableTiII? Log of the Ti II abundancephys.abundfloatnullableCr? Log of the Cr abundancephys.abundfloatnullableMn[-1/0.2]? Log of the Mn abundancephys.abundfloatnullableFeII[-4.2/-1.3]? Log of the Fe II abundancephys.abund.FefloatnullableCo? Log of the Co abundancephys.abundfloatnullableNi? Log of the Ni abundancephys.abundfloatnullablel_SrLimit flag on Srmeta.code.errorcharSr[-2.3/1.9]? Log of the Sr abundancephys.abundfloatnullablef_Sr[f] Abundance from literature (2)phys.abundcharBa[-2.1/2.7]? Log of the Ba abundancephys.abundfloatnullablef_Ba[f] Abundance from literature (2)phys.abundcharRefReference(s) code (G3)phys.abundchar