J/ApJ/762/25ivo://CDS.VizieR/J/ApJ/762/25doi:10.26093/cds/vizier.17620025CDSNorris J.E.Bessell M.S.Yong D.Christlieb N.Barklem P.S.,Asplund M.Murphy S.J.Beers T.C.Frebel A.Ryan S.G.2017-06-01T08:51:55Z2014-10-10T12:17:57ZCDS support team

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

cds-question@unistra.frline-intensitieschemically-peculiar-starsmetallicityradial-velocityWe report the discovery of 34 stars in the Hamburg/ESO Survey (HES) for metal-poor stars and the Sloan Digital Sky Survey (SDSS) that have [Fe/H]<~-3.0. Their median and minimum abundances are [Fe/H]=-3.1 and -4.1, respectively, while 10 stars have [Fe/H]<-3.5. High-resolution, high signal-to-noise spectroscopic data --equivalent widths and radial velocities-- are presented for these stars, together with an additional four objects previously reported or currently being investigated elsewhere. We have determined the atmospheric parameters, effective temperature (T_eff_), and surface gravity (logg), which are critical in the determination of the chemical abundances and the evolutionary status of these stars. Three techniques were used to derive these parameters. Spectrophotometric fits to model atmosphere fluxes were used to derive T_eff_, logg, and an estimate of E(B-V); H{alpha}, H{beta}, and H{gamma} profile fitting to model atmosphere results provided the second determination of T_eff_and logg; and finally, we used an empirical T_eff_-calibrated H{delta} index, for the third, independent T_eff_determination. The three values of T_eff_ are in good agreement, although the profile fitting may yield systematically cooler T_eff_values, by ~100K. This collective data set will be analyzed in future papers in the present series to utilize the most metal-poor stars as probes of conditions in the early universe.2013ApJ...762...25Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/762/25CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/98 : Stark broadening of H lines (Stehle+, 1999)J/ApJ/762/27 : Most metal-poor stars. III. [Fe/H]<=-3.0 (Yong+, 2013)J/ApJ/762/26 : Most metal-poor stars. II. 190 Galactic halo stars (Yong+, 2013)J/AJ/145/13 : Metal-poor stars from SDSS/SEGUE. I. Abundances (Aoki+, 2013)J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)J/AJ/142/188 : Metal-poor stars from the HES using CH G-band (Placco+, 2011)J/ApJ/742/54 : CASH project II. extremely metal-poor stars (Hollek+, 2011)J/ApJ/711/350 : Metal-poor giant Boo-1137 abundances (Norris+, 2010)J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)J/A+A/501/519 : Metal-poor turnoff stars abundances (Bonifacio+, 2009)J/A+A/484/721 : HES survey. IV. Cand. metal-poor stars (Christlieb+, 2008)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/ApJ/652/1585 : Bright metal-poor stars from HES survey (Frebel+, 2006)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/AJ/128/2402 : Extremely metal-poor star candidates abundances (Lai+, 2004)J/A+A/403/1105 : Metal-poor giants equivalent widths (Francois+, 2003)J/AJ/119/2866 : Proper motions of metal-poor stars (Beers+, 2000)J/ApJS/123/639 : UBV photometry of metal-weak candidates (Norris+, 1999)J/AJ/117/981 : Estimation of stellar metal abundance. II. (Beers+, 1999)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/ApJ/762/25https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/762/25http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/762/25https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/762/25https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/762/25http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/762/25GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/762/25/stars (Program stars and their atmospheric parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/762/25/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/762/25/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/762/25/stars?GETtext/xml+votable180.050000true139.70791737.7408330.0055555555555555566/2067 4253 5406 5450 5768 17545 18953 24674 25357 25385 25540 25813 25891 26941 27035 31394 33579 34513 34844 35181 35524 36280 36542 36583 36658 40410 43926 45345 45546 45904 45913 45959 45969 46008 46614 47063 48286 48534https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/762/25?format=asciiOpticaldefaultJ/ApJ/762/25/ewAtomic data and equivalent widths for the program stars (tables 3-6 transposed)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAnameAbbreviated star namemeta.id;meta.maincharlambda[3743.3/6497] Wavelength in Angstroms0.1nmem.wlfloatIon[11/56.1] Species identifierphys.atmol.ionStagefloatchi[0/4.4] Excitation potential {chi}eVphys.atmol.excitationfloatlog(gf)[-5.4/0.5] Log of the oscillator strengthphys.atmol.oscStrengthfloatl_EWLimit flag on EWmeta.code.error;spect.line.eqWidthcharEW? Equivalent width in milli-Angstroms0.1pmspect.line.eqWidthfloatnullablef_EW[b] Flag on EW (1)meta.codecharJ/ApJ/762/25/starsProgram stars and their atmospheric parametersAnameSimbad column added by the CDSmeta.idcharprimarySimbadNameSimbad column added by the CDSmeta.idcharNh[1/11] Number of H linesmeta.numberintNameStar namemeta.id;meta.maincharprimaryVPVelocity Plotmeta.ref.urlcharlogg2Gravity (6)log(cm.s**-2)phys.gravityfloatHP2? H{delta} line index (7)0.1nmspect.line.intensityfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_Name[b] b: SDSS "MJD-plate-fiber" nomenclaturemeta.notecharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainNrvNumber of radial velocity measures in table 8meta.numberintnullableBmag[12.9/16.5] Photographic B magnitude from HES, (J/A+A/484/721)magphot.mag;em.opt.Bfloatf_Bmag[c] Bmag from SDSS (1)meta.codechar(B-V)0[0.3/1.1] B-V color indexmagphot.color;em.opt.B;em.opt.Vfloatr_(B-V)0[1/4] Source of (B-V)_0_ (2)meta.ref;pos.frameintK'[0/4.5]? The CaII-K line index defined by Beers et al. (1999, Cat. J/AJ/117/981)0.1nmspect.line.intensityfloatnullableG'[0/7.4]? The CH G-band index0.1nmspect.line.intensityfloatnullableH'[0/5.4]? The mean of hydrogen indices H{gamma}and H{delta}0.1nmspect.line.intensityfloatnullable[Fe/H]K[-3.9/-2.8]? Iron abundance, following Beers et al., 1999, Cat. J/AJ/117/981log(Sun)phys.abund.Fefloatnullable[Fe/H][-4.1/-2.7] Value of [Fe/H]log(Sun)phys.abund.Fefloatf_[Fe/H][d] Averaged [Fe/H] (3)meta.codecharS/NSignal to noise ratio (S/N per ~0.17{AA} pixel at 4500{AA}) (4)stat.snr;instr.pixelintWminSmallest equivalent width that we could reliably measure in each of the spectra in milli-Angstroms (4)0.1pmspect.line.eqWidthintEWDisplay the Equivalent Widths for this starmeta.ref.urlcharPapDisplay data from Papers II (J/ApJ/762/26) and III (J/ApJ/762/27)meta.ref.urlcharC[d] C-rich starmeta.notecharTeff1? Effective temperature T_eff_(Sp) (5)Kphys.temperature.effectiveintnullablelogg1? Gravity (5)log(cm.s**-2)phys.gravityfloatnullableE(B-V)1? Color excess (5)magphot.color.excessfloatnullableTeff2Effective temperature T_eff_(Balmer) (6)Kphys.temperature.effectiveinte_Teff2Mean error ({sigma}) on Teff2 (6)Kstat.errorintTeff3? Effective temperature T_eff_(H{delta}) (7)Kphys.temperature.effectiveintnullableTeffFinal effective temperatureKphys.temperature.effectiveinte_Teff? 1-{sigma} on TeffKstat.error;phys.temperature.effectiveintnullableJ/ApJ/762/25/table8Individual radial velocitiesNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope code (1)meta.code;instr.telcharDateDate of the observation (UT)time.epochnullableJDJulian Date of the observationdtime.epochdoubleHRV[-254/392] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloat