J/AJ/145/13ivo://CDS.VizieR/J/AJ/145/13doi:10.26093/cds/vizier.51450013CDSAoki W.Beers T.C.Lee Y.S.Honda S.Ito H.Takada-hidai M.,Frebel A.Suda T.Fujimoto M.Y.Carollo D.Sivarani T.2014-04-08T07:04:52Z2014-03-19T14:01:32ZCDS support team

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

cds-question@unistra.frchemically-peculiar-starsradial-velocitychemical-abundanceseffective-temperaturepopulation-ii-starsChemical compositions are determined based on high-resolution spectroscopy for 137 candidate extremely metal-poor (EMP) stars selected from the Sloan Digital Sky Survey (SDSS) and its first stellar extension, the Sloan Extension for Galactic Understanding and Exploration (SEGUE). High-resolution spectra with moderate signal-to-noise (S/N) ratios were obtained with the High Dispersion Spectrograph of the Subaru Telescope. Most of the sample (approximately 80%) are main-sequence turnoff stars, including dwarfs and subgiants. Four cool main-sequence stars, the most metal-deficient such stars known, are included in the remaining sample. Good agreement is found between effective temperatures estimated by the SEGUE stellar parameter pipeline, based on the SDSS/SEGUE medium-resolution spectra, and those estimated from the broadband (V - K)_0_ and (g - r)_0_colors. Our abundance measurements reveal that 70 stars in our sample have [Fe/H] < -3, adding a significant number of EMP stars to the currently known sample. Our analyses determine the abundances of eight elements (C, Na, Mg, Ca, Ti, Cr, Sr, and Ba) in addition to Fe. The fraction of carbon-enhanced metal-poor stars ([C/Fe] > +0.7) among the 25 giants in our sample is as high as 36%, while only a lower limit on the fraction (9%) is estimated for turnoff stars. This paper is the first of a series of papers based on these observational results. The following papers in this series will discuss the higher-resolution and higher-S/N observations of a subset of this sample, the metallicity distribution function, binarity, and correlations between the chemical composition and kinematics of extremely metal-poor stars.2013AJ....145...13Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/145/13CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/ApJ/742/54 : CASH project II. 14 metal-poor stars (Hollek+, 2011)J/A+A/526/A99 : Metal-poor solar-type stars spectros. & masses (Sousa+, 2011)J/AJ/141/90 : SEGUE stellar parameter pipeline. V. (Lee+, 2011)J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/A+A/501/519 : Metal-poor turnoff stars abundances (Bonifacio+, 2009)J/A+A/484/721 : HES. IV. Candidate metal-poor stars (Christlieb+, 2008)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/ApJ/655/492 : Equivalent widths of 26 metal-poor stars (Aoki+, 2007)J/AJ/132/137 : Abundances of metal-poor carbon stars (Cohen+, 2006)J/ApJ/652/1585 : Bright metal-poor stars from HES survey (Frebel+, 2006)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/A+A/440/321 : Chemical abundances in 43 metal-poor stars (Jonsell+, 2005)J/AJ/130/2804 : Carbon abundances in metal-poor stars (Rossi+, 2005)J/ApJS/155/651 : Evolution of extremely metal-poor stars (Herwig+, 2004)J/AJ/128/2402 : Extremely metal-poor star candidates abundances (Lai+, 2004)J/A+A/403/1105 : Extremely metal-poor giants EWs (Francois+, 2003)J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)J/A+A/300/751 : Metal-poor stars spectroscopy. II (Axer+, 1995)J/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992)J/AJ/90/2089 : Stars of very low metal abundance. I (Beers+, 1985)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/145/13https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/145/13http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/145/13https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/145/13https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/145/13http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/145/13GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/145/13/stars (Photometry (table1), velocities (table2), effective temperatures (table4), abundances (table5a & 5b), their uncertainties (table5c), and the number of lines used (table5d) of 137 candidate Extremely Metal-Poor stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/145/13/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/145/13/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/145/13/stars?GETtext/xml+votable180.050000true0.582791729.48105560.0055555555555555566/0 25 712 971 1701 2067 2180 4101 4111 4253 4269 4706 4750 4854 5093 5310 5373 5450 5973 6219 6375 6401 6412 6652 7321 7787 7830 8127 8335 8367 8370 8418 8665 8667 9072 9087 9153 9291 9298 9380 9438 9462 9467 9512 9581 9583 9594 9901 9914 10147 10282 10376 10425 10786 10934 11277 11328 11330 11405 11432 11439 11442 11452 11490 11848 12656 15001 15349 16795 16796 17237 17240 17253 17362 17406 17555 17600 18023 18063 18074 18226 18410 18519 18608 18612 18926 19116 19329 19599 19752 20034 20171 20330 20474 21854 21971 22356 22514 23207 23342 23429 23467 24046 25963 25980 25993 26027 26114 26115 26162 26265 26450 26565 27105 27322 27360 27589 27884 27986 28119 28219 28587 29777 30045 31528 31719 31882 32156 32444 32553 49009 49012 49019 491498.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/145/13?format=asciiOpticaldefaultJ/AJ/145/13/starsPhotometry (table1), velocities (table2), effective temperatures (table4), abundances (table5a & 5b), their uncertainties (table5c), and the number of lines used (table5d) of 137 candidate Extremely Metal-Poor starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/137] Running sequence numbermeta.id;meta.mainintSDSSSDSS short name (JHHMM+DDMM)meta.id;meta.maincharDate1Date of observationtime.epochnullableDR9Display the SDSS-DR9 photometric catalog (cat. V/139) within 1"meta.ref.urlcharSloanDisplay the SDSS data for this starmeta.ref.urlchar_RAPositions from SDSS name (right ascension part)degpos.eq.ra;meta.main_DEPositions from SDSS name (declination part)degpos.eq.dec;meta.maineCa? Uncertainty in Ca abundance (6)log(Sun)stat.errorfloatnullablef_SDSS[a] Object that was later observed at higher resolution and higher signal-to-noise ratiometa.codecharDate2Second date of observationtime.epoch;obsnullableExpExposure timemintime.duration;obs.exposureintS/N1Signal-to-noise ratio at 4300{AA}stat.snrintS/N2Signal-to-noise ratio at 5180{AA}stat.snrintHRV1Heliocentric radial velocity from Subaru Spectrakm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV1Error in HRV1km/sstat.errorfloatHRV2Heliocentric radial velocity from SDSSkm/sspect.dopplerVeloc;pos.heliocentricfloatSDSS2SDSS name (JHHMMSS.ss+DDMMSS.s)meta.idcharNameObject identifiermeta.idchargmagSDSS dereddened g magnitude (g_0_)magphot.mag;em.opt.Bfloatg-rSDSS dereddened (g-r) color index (g-r)_0_magphot.color;em.opt.B;em.opt.RfloatVmagDereddened V magnitude (V_0_) (1)magphot.mag;em.opt.VfloatE(B-V)The (B-V) color excess (2)magphot.color.excessfloatKmag2MASS Ks magnitude (from cat. VII/233)magphot.mag;em.IR.KfloatTeff1SSPP estimate of effective temperature (3)Kphys.temperature.effectiveintlogg1? SSPP estimate of surface gravity (3)log(cm.s**-2)phys.gravityfloatnullable[Fe/H]1? SSPP estimate of metallicity (3)log(Sun)phys.abund.ZfloatnullableTeff2Estimate of effective temperature based on (V-K)_0_ colorKphys.temperature.effectiveintTeff3Estimate of effective temperature based on (g-r)_0_ colorKphys.temperature.effectiveintTeffAdopted effective temperatureKphys.temperature.effectiveintloggAdopted surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Adopted metallicitylog(Sun)phys.abund.ZfloatA(Fe1)Fe abundance from FeI lines log{epsilon}(FeI) (4)phys.abundfloatA(Fe2)? Fe abun. from FeII lines log{epsilon}(FeII) (4)phys.abundfloatnullableA(Na)? Na abundance log{epsilon}(Na) (4)phys.abundfloatnullableA(Mg)? Mg abundance log{epsilon}(Mg) (4)phys.abundfloatnullableA(Ca)? Ca abundance log{epsilon}(Ca) (4)phys.abundfloatnullableA(Ti)? Ti abundance log{epsilon}(Ti) (4)phys.abundfloatnullableA(Dr)? Sr abundance log{epsilon}(Sr) (4)phys.abundfloatnullableA(Ba)? Ba abundance log{epsilon}(Ba) (4)phys.abundfloatnullableA(C)? C abundance log{epsilon}(C) (4)phys.abundfloatnullable[Fe1/H]Adopted metallicity (5)log(Sun)phys.abundfloat[Fe2/H]? The Fe abundance from FeII lines (5)log(Sun)phys.abundfloatnullable[Na/Fe]? The Na abundance (5)log(Sun)phys.abundfloatnullable[Mg/Fe]? The Mg abundance (5)log(Sun)phys.abundfloatnullable[Ca/Fe]? The Ca abundance (5)log(Sun)phys.abundfloatnullable[Ti/Fe]? The Ti abundance (5)log(Sun)phys.abundfloatnullable[Sr/Fe]? The Sr abundance (5)log(Sun)phys.abundfloatnullable[Ba/Fe]? The Ba abundance (5)log(Sun)phys.abundfloatnullable[C/Fe]? The C abundance (5)log(Sun)phys.abundfloatnullableeFe1Uncertainty in Fe abundance from FeI lines (6)log(Sun)stat.errorfloateFe2? Uncertainty in Fe abundance from FeII lines (6)log(Sun)stat.errorfloatnullableeNa? Uncertainty in Na abundance (6)log(Sun)stat.errorfloatnullableeMg? Uncertainty in Mg abundance (6)log(Sun)stat.errorfloatnullableeTi? Uncertainty in Ti abundance (6)log(Sun)stat.errorfloatnullableeSr? Uncertainty in Sr abundance (6)log(Sun)stat.errorfloatnullableeBa? Uncertainty in Ba abundance (6)log(Sun)stat.errorfloatnullableeC? Uncertainty in C abundance (6)log(Sun)stat.errorfloatnullablenFe1Number of lines used for Fe (from FeI lines)meta.numberintnFe2? Number of lines used for Fe (from FeII lines)meta.numberintnullablenNa? Number of lines used for Nameta.numberintnullablenMg? Number of lines used for Mgmeta.numberintnullablenCa? Number of lines used for Cameta.numberintnullablenTi? Number of lines used for Timeta.numberintnullablenDr? Number of lines used for Srmeta.numberintnullablenBa? Number of lines used for Bameta.numberintnullableJ/AJ/145/13/table3Spectral line datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIonization state (I=neutral, II=ionized)phys.atmol.ionStagenullablelambdaWavelength {lambda}; in {AA}0.1nmem.wldoubleloggfLog of the oscillator strengthphys.atmol.oscStrengthfloatLEPLower excitation potentialeVphys.atmol.excitation;stat.minfloatRefReference; in refs.dat filemeta.ref;pos.frameintElElement identificationmeta.id;phys.atmol.elementcharJ/AJ/145/13/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharRefReference numbermeta.id;meta.mainintprimary