J/A+A/614/A68ivo://CDS.VizieR/J/A+A/614/A68doi:10.26093/cds/vizier.36140068CDSCaffau E.Gallagher A.J.Bonifacio P.Spite M.Duffau S.,Spite F.Monaco L.Sbordone L.2018-09-18T14:33:58Z2018-06-15T09:04:20ZCDS support team

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

cds-question@unistra.frpopulation-ii-starschemically-peculiar-starscarbon-starschemical-abundancesradial-velocityCarbon-enhanced metal-poor (CEMP) stars represent a sizeable fraction of all known metal-poor stars in the Galaxy. Their formation and composition remains a significant topic of investigation within the stellar astrophysics community. We analysed a sample of low-resolution spectra of 30 dwarf stars, obtained using the the visual and near UV FOcal Reducer and low dispersion Spectrograph for the Very Large Telescope (FORS/VLT) of the European Southern Observatory (ESO) and the Gemini Multi-Object Spectrographs (GMOS) at the GEMINI telescope, to derive their metallicity and carbon abundance. We derived C and Ca from all spectra, and Fe and Ba from the majority of the stars. Conclusions. We have extended the population statistics of CEMP stars and have confirmed that in general, stars with a high C abundance belonging to the high C band show a high Ba-content (CEMP-s or -r/s), while stars with a normal C-abundance or that are C-rich, but belong to the low C band, are normal in Ba (CEMP-no).2018A&A...614A..68Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/614/A68CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)J/ApJ/655/492 : Equivalent widths of 26 metal-poor stars (Aoki+, 2007)J/ApJ/658/367 : Abundances of carbon stars in Galactic halo (Komiya+, 2007)J/ApJ/658/1203 : Nitrogen-enhanced metal-poor stars (Johnson+, 2007)J/A+A/509/A93 : Carbon-enhanced metal-poor stars (Masseron+, 2010)J/A+A/548/A34 : Abundances of Carbon-enhanced metal-poor stars (Allen+, 2012)J/ApJ/762/27 : Most metal-poor stars. III. 86 [Fe/H]<=-3.0 stars (Yong+ 2013)J/ApJ/773/33 : Chemical analysis of metal-poor subgiant BD+44 493 (Ito+ 2013)J/ApJ/788/180 : Very metal-poor stars in the Milky Way's halo (Carollo+, 2014)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014)J/A+A/574/A129 : The First CEMP star in the Sculptor dSph (Skuladottir+, 2015)J/A+A/581/A22 : 67 CEMP-s stars model analysis (Abate+, 2015)J/ApJ/814/121 : CASH project. III. The CEMP star HE0414-0343 (Hollek+, 2015)J/A+A/586/A158 : Binary properties of CH and CEMP stars (Jorissen+, 2016)J/ApJ/824/L19 : Carbon-enhanced metal-poor star BD+44493 EWs (Roederer+, 2016)J/ApJ/833/20 : Carbon-enhanced metal-poor (CEMP) star abundances (Yoon+ 2016)J/A+A/606/A55 : Rotational mixing in CEMP-s stars (Matrozis+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/614/A68https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/614/A68http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/614/A68https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/614/A68https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/614/A68http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/614/A68GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/614/A68/table1 (Characteristics of the stars analysed in the paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/614/A68/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/614/A68/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/614/A68/table1?GETtext/xml+votable180.050000true3.94771440.224066630.0055555555555555566/30 4103 8277 17694 18071 18086 18114 18839 18851 19089 19244 19598 20032 23053 25337 25938 25993 26085 26118 26200 26465-26466 27792 27973 31616 48894 490113.588997330618193e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/614/A68?format=asciidefaultJ/A+A/614/A68/table1Characteristics of the stars analysed in the paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name of the star (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.maingmagSDSS DR12 g magnitude (1)magphot.mag;em.opt.BfloatMJDModified Julian datedtime.epochdoubleRVD? Radial Velocity from SDSSkm/sphys.veloc;pos.heliocentricintnullables_RVD? Uncertainty on the Radial Velocity from SDSS (line-to-line scatter)km/sstat.error;spect.dopplerVelocintnullableRVF? Radial Velocity from FORS2 spectrakm/sphys.veloc;pos.heliocentricintnullables_RVF? Uncertainty on the Radial Velocity from FORS2 spectra (line-to-line scatter)km/sstat.error;spect.dopplerVelocintnullable[M/H]S? Metallicity derived from the SDSS spectra (2)phys.abund.Zfloatnullables_[M/H]S? Uncertainty on the metallicity derived from the SDSS spectra (line-to-line scatter)stat.error;phys.abund.Zfloatnullable[Fe/H]? Abundance [Fe/H] derived from the FORS2 and GMOS spectra (3)phys.abund.Fefloatnullableu_[Fe/H]Uncertainty flag on [Fe/H] (4)meta.code.error;phys.abund.Fechars_[Fe/H]? Uncertainty on the [Fe/H] derived from the FORS2 and GMOS spectra (line-to-line scatter)stat.error;phys.abund.FefloatnullableSloanDisplay the online SDSS data for the this objectmeta.ref.urlcharJ/A+A/614/A68/table2Chemical composition of the stars analysed in the paperA(Mn)? Mn abundancephys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS name of the star (JHHMMSS.ss+DDMMSS.s)meta.idcharStarStar name (SDSSJHHMM+DDMM)meta.id;meta.maincharn_Star[1/2]? Observation number when 2 measurementsmeta.noteintnullableTeffeffective temperature [K]Kphys.temperature.effectiveintA(Fe)Fe abundance from FeI lines, A(Fe)phys.abundfloate_A(Fe)Uncertainty on Fe abundance from FeI linesstat.errorfloatu_e_A(Fe)Uncertainty flag on e_A(Fe)meta.code.errorcharA(FeII)? Fe abundance from FeII linesphys.abundfloatnullablee_A(FeII)? uncertainty on the abundance from FeII linesstat.errorfloatnullableA(C)C abundance, A(C)phys.abundfloatu_A(C)Uncertainty flag on A(C)meta.code.errorchar3DcorC3D-correction on the C abundanceinstr.paramfloatA(Mg)? Mg abundancephys.abundfloatnullablee_A(Mg)? uncertainty on the Mg abundancestat.errorfloatnullableA(Si)? Si abundancephys.abundfloatnullableA(CaK)Ca abundance from the CaII-K linephys.abundfloatu_A(CaK)Uncertainty flag on A(CaK)meta.code.errorcharA(Ca)? Ca abundance from CaI linesphys.abundfloatnullablee_A(Ca)? uncertainty on the CaI abundancestat.errorfloatnullableA(Ti)? Ti abundancephys.abundfloatnullablee_A(Ti)? uncertainty on the Ti abundancestat.errorfloatnullablee_A(Mn)? uncertainty on the Mn abundancestat.errorfloatnullablel_A(Sr)Limit flag on A(Sr)meta.code.errorcharA(Sr)? Sr abundancephys.abundfloatnullableu_A(Sr)Uncertainty flag on A(Sr)meta.code.errorcharl_A(Ba)Limit flag on A(Ba)meta.code.errorcharA(Ba)Ba abundancephys.abundfloatu_A(Ba)Uncertainty flag on A(Ba)meta.code.errorchar