Spectroscopy of low-metallicity star candidates J/ApJ/870/122 ivo://CDS.VizieR/J/ApJ/870/122 doi:10.26093/cds/vizier.18700122 CDS Placco V.M. Santucci R.M. Beers T.C. Chaname J. Sepulveda M.P.,Coronado J. Rossi S. Lee Y.S. Starkenburg E. Youakim K. Barrientos M.,Ezzeddine R. Frebel A. Hansen T.T. Holmbeck E.M. Ji A.P.,Rasmussen K.C. Roederer I.U. Sakari C.M. Whitten D.D. 2021-07-09T08:43:06Z 2020-03-04T15:08:18Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr chemical-abundances carbon-stars population-ii-stars spectroscopy interstellar-reddening visible-astronomy Wide-band photometry infrared-photometry chemically-peculiar-stars We present results from an observing campaign to identify low-metallicity stars in the Best & Brightest Survey. From medium-resolution (R~1200-2000) spectroscopy of 857 candidates, we estimate the stellar atmospheric parameters (T_eff_, logg, and [Fe/H]), as well as carbon and {alpha}-element abundances. We find that 69% of the observed stars have [Fe/H]<=-1.0, 39% have [Fe/H]<=-2.0, and 2% have [Fe/H]<=-3.0. There are also 133 carbon-enhanced metal-poor (CEMP) stars in this sample, with 97 CEMP Group I and 36 CEMP Group II stars identified in the A(C) versus [Fe/H] diagram. A subset of the confirmed low-metallicity stars were followed-up with high-resolution spectroscopy, as part of the R-process Alliance, with the goal of identifying new highly and moderately r-process-enhanced stars. Comparison between the stellar atmospheric parameters estimated in this work and from high-resolution spectroscopy exhibit good agreement, confirming our expectation that medium-resolution observing campaigns are an effective way of selecting interesting stars for further, more targeted, efforts. 2019ApJ...870..122P https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/870/122 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) I/322 : UCAC4 Catalogue (Zacharias+, 2012) III/272 : RAVE 4th data release (Kordopatis+, 2013) II/328 : AllWISE Data Release (Cutri+, 2013) J/ApJ/562/528 : Teff and log(g) of low-metallicity stars (Snider+, 2001) J/A+A/422/527 : Metal-poor star uvby-beta photometry. X. (Schuster+, 2004) J/AJ/136/2050 : SEGUE stellar parameter pipeline. II. (Lee+, 2008) J/PASP/121/117 : Fe & Ti abundances of 12 low-metallicity stars (Woolf+, 2009) J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010) J/AJ/141/90 : SEGUE stellar parameter pipeline. V. (Lee+, 2011) J/ApJ/762/27 : Most metal-poor stars. III. 86 [Fe/H]<=-3.0 stars (Yong+, 2013) J/ApJ/773/33 : Chem.analysis of the metal-poor subgiant BD+44493 (Ito+, 2013) J/ApJ/786/74 : EW measurements of 6 Segue 1 red giants (Frebel+, 2014) J/ApJ/794/58 : Metal-poor stars in the thick disk of the Galaxy (Beers+, 2014) J/ApJ/797/13 : Abundances of bright metal-poor stars (Schlaufman+, 2014) J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014) J/A+A/579/A28 : Abundances of 3 CEMP stars (Bonifacio+, 2015) J/ApJ/833/20 : Carbon-enhanced metal-poor (CEMP) star abundances (Yoon+, 2016) J/A+A/608/A46 : Constraining cosmic scatter (Reggiani+, 2017) J/ApJ/835/81 : Bright metal-poor stars from HES Survey. II. (Beers+, 2017) J/ApJ/850/179 : 2MASS J15111324-2130030 metal-poor star abundance (Casey+,2017) J/AJ/155/256 : Spectro. validation of RAVE metal-poor stars (Placco+, 2018) J/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018) J/ApJ/862/174 : Spectroscopy obs. of RAVE J094921.8-161722 (Gull+, 2018) J/ApJ/868/110 : R-Process Alliance: 1st release in Galactic halo (Sakari+,2018) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/870/122 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/870/122 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/870/122 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/870/122 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/870/122 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/870/122 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/870/122/stars (2MASS sample, reddening estimates and stellar parameters from the n-SSPP (Tables 1, 2 and 3)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/870/122/stars? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/870/122/stars? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/870/122/stars? 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reddening estimates and stellar parameters from the n-SSPP (Tables 1, 2 and 3) recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int WISEA Star Name (JHHMMSS.ss+DDMMSS.s) meta.id;meta.main char Date UTC date of observation time.epoch;obs nullable Tel Telescope meta.id;instr.tel char Inst Instrument (1) meta.id;instr char PID Proposal ID meta.id;obs char Exp [130/1500] Exposure duration s time.duration;obs.exposure int RAJ2000 Hour of Right Ascension (J2000) pos.eq.ra;meta.main DEJ2000 Degree of Declination (J2000) pos.eq.dec;meta.main GLON [0.1/360] Galactic longitude, decimal degrees deg pos.galactic.lon GLAT [-84/70] Galactic latitude, decimal degrees deg pos.galactic.lat float Vmag [12/15]? APASS V-band magnitude (2) mag phot.mag;em.opt.V float nullable B-V [0.23/1.3]? APASS B-V color index (2) mag phot.color;em.opt.B;em.opt.V float nullable Jmag [9.9/16] 2MASS J-band magnitude (3) mag phot.mag;em.IR.J float J-K [0.37/0.79] 2MASS J-Ks color index (3) mag phot.color;em.IR.J;em.IR.K float Qflg 2MASS photometric quality flag (3) meta.code.qual;phot char E(B-V) [0.006/4.9] Reddening estimate (4) mag phot.color.excess float Teff [4393/8985]? Stellar effective temperature K phys.temperature.effective int nullable logg [0.2/5]? Stellar log surface gravity log(cm.s**-2) phys.gravity float nullable [Fe/H] [-3.7/0.11]? Stellar metallicity phys.abund.Z float nullable [C/Fe] [-1.1/2.6]? Carbon-to-iron ratio phys.abund float nullable d[C/Fe] [0/0.77]? Carbon correction (5) phys.abund float nullable c[C/Fe] [-1.1/2.6]? Corrected carbon-to-iron ratio phys.abund float nullable A(C) [4.9/11]? Corrected absolute carbon abundance (A(C)=log(NC/NH)+12) phys.abund float nullable [A/Fe] [-0.17/0.6]? Alpha element-to-iron ratio phys.abund float nullable 2M Display the 2MASS data (II/246) within 3" meta.ref.url char APASS Display the APASS DR9 data (II/336) within 3" meta.ref.url char Simbad Simbad column added by the CDS meta.ref.url char