J/AJ/125/2502ivo://CDS.VizieR/J/AJ/125/2502doi:10.26093/cds/vizier.51252502CDSMorrison H.L.Norris J.Mateo M.Harding P.Olszewski E.W.,Shectman S.A.Dohm-Palmer R.C.Helmi A.Freeman K.C.2023-04-06T16:50:55Z2003-12-29T16:21:34ZCDS support team

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

cds-question@unistra.frhalo-starsspectroscopyapparent-magnitudemetallicityWe present our calibration of spectroscopic measures of luminosity and metallicity for halo giant candidates and give metallicities and distances for our first sample of spectroscopically confirmed giants. These giants have distances ranging from 15 to 83kpc. As surveys reach farther into the Galaxy's halo with K giant samples, identification of giants becomes more difficult. This is because the numbers of foreground halo K dwarfs rise for V magnitudes of 19-20, typical for halo giants at 100kpc. Our photometric survey uses the strength of the Mgb/H feature near 5170{AA} to weed K dwarfs out of the disk and thick disk, but we need spectroscopic measures of the strength of the Ca II K, Ca I {lambda}4227, and Mgb/H features to distinguish between the very metal-poor dwarfs and halo giants. Using a full error analysis of our spectroscopic measures, we show why a signal-to-noise ratio of ~15pixel^-1^ at Ca I {lambda}4227 and ~10 at Ca II K is needed for reliable luminosity discrimination. We use the Ca II K and Mgb features to measure metallicity in our halo giants, with typical errors (random plus systematic) of 0.3dex for [Fe/H] values from -0.8 to -3.0.2003AJ....125.2502Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/125/2502CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/125/2502https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/125/2502http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/125/2502https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/125/2502https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/125/2502http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/125/2502GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/125/2502/table1 (Metallicity and color of dwarf standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2502/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2502/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2502/table1?GETtext/xml+votable180.050000true60.81249535.2732760.005555555555555556Cone search capability for table J/AJ/125/2502/table2 (Metallicity and color of giant standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2502/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2502/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2502/table2?GETtext/xml+votable180.050000trueCone search capability for table J/AJ/125/2502/table6 (Spectroscopic Observations for Giant Candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2502/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2502/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2502/table6?GETtext/xml+votable180.050000true217.9438710.780490.005555555555555556Cone search capability for table J/AJ/125/2502/table7 (Metallicities and distances for spectroscopically confirmed giants)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/125/2502/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/125/2502/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/125/2502/table7?GETtext/xml+votable180.050000true228.506119.310780.0055555555555555565/2069 6/1285 1556 2997 3712 4219 4354-4355 4506 5621 7211 8093 8200 8289 8294 8359 8370 9936 11512 13025 14539 14931 15511 16808 19097 19670 20390 21209 21328 22205 23064 23428 25015 25050-25051 25117 25177 25259 25373 25416 25476-25477 25591 25676 25846 25949 25953 25956 25963 26110 26165 26195 26208 26274 26461 26467 26695 26722 26906 26968 27193 27218 27245 27256 27276 27499 27507 27711 27732 27747 27763 27796 28161 28164 31451 31757 31785 40333 40337 40934-40935 44685 44692 44796 44798 44816 44940 45824-45825 45927 45933 45967 46605-46606 49063https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/125/2502?format=asciiOpticaldefaultJ/AJ/125/2502/table1Metallicity and color of dwarf standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryn_Name[a] Note on Name (1)meta.notechar[Fe/H]Metallicitylog(Sun)phys.abund.Fefloatn_[Fe/H][bc] note on [Fe/H] (1)meta.notechar(b-y)0? Dereddened Stroemgren (b-y) colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullable(V-I)0? Dereddened Johnson (V-I) colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullable(B-V)0? Dereddened Johnson (B-V) colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullable(M-T2)0Dereddened Washington (M-T_2_) colour indexmagphot.colorfloatu_(M-T2)0Uncertainty flag on (M-T2)0meta.code.errorcharE(B-V)Redenningmagphot.color.excessfloatr_[Fe/H]References for [Fe/H], in refs.dat filemeta.refcharr_(b-y)0References for photometry, in refs.dat filemeta.refcharn_r_(b-y)0[e] Note on r_(b-y)0 (1)meta.notecharr_E(B-V)References for redenning, in refs.dat filemeta.refintn_r_E(B-V)[d] Note on r_E(B-V) (1)meta.notecharSimbadSimbad column added by the CDSmeta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/AJ/125/2502/table2Metallicity and color of giant standardsE(B-V)Redenningmagphot.color.excessfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryn_Name[a] Note on Name (1)meta.notechar[Fe/H]Metallicitylog(Sun)phys.abund.Fefloatn_[Fe/H][bc] note on [Fe/H] (1)meta.notechar(b-y)0? Dereddened Stroemgren (b-y) colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullable(V-I)0? Dereddened Johnson (V-I) colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullable(B-V)0? Dereddened Johnson (B-V) colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullable(M-T2)0Dereddened Washington (M-T_2_) colour indexmagphot.colorfloatu_(M-T2)0Uncertainty flag on (M-T2)0meta.code.errorcharr_[Fe/H]References for [Fe/H], in refs.dat filemeta.refcharr_(b-y)0References for photometry, in refs.dat filemeta.refcharn_r_(b-y)0[e] Note on r_(b-y)0 (1)meta.notecharr_E(B-V)References for redenning, in refs.dat filemeta.refintn_r_E(B-V)[d] Note on r_E(B-V) (1)meta.notecharSimbadSimbad column added by the CDSmeta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/AJ/125/2502/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.refintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/AJ/125/2502/table4Spectral indices for dwarf standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.mainchar[Fe/H]Metallicitylog(Sun)phys.abund.Fefloat(M-T2)0Dereddened Washington (M-T_2_) colour indexmagphot.colorfloatu_(M-T2)0Uncertainty flag on (M-T2)0meta.code.errorcharK'K' index (Beers, 1999AJ....117..981B)magspect.indexfloatCaICaI (4227{AA}) index metallicity measurementmagspect.indexfloatMgMg index metallicity measurement0.1nmspect.indexfloatJ/AJ/125/2502/table5Spectral Indices for giant standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.mainchar[Fe/H]Metallicitylog(Sun)phys.abund.Fefloat(M-T2)0Dereddened Washington (M-T_2_) colour indexmagphot.colorfloatu_(M-T2)0Uncertainty flag on (M-T2)0meta.code.errorcharK'K' index (Beers, 1999AJ....117..981B)magspect.indexfloatCaICaI (4227{AA}) index metallicity measurementmagspect.indexfloatMgMg index metallicity measurement0.1nmspect.indexfloatJ/AJ/125/2502/table6Spectroscopic Observations for Giant CandidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitude (G1)degpos.galactic.lonGLATGalactic latitude (G1)degpos.galactic.latfloatMmagThe Washington M-band magnitudemagphot.mag;em.IR.4-8umfloatM-T2The Washington (M-T_2_) colormagphot.colorfloate_M-T2Error in M-T2magstat.errorfloatC-MThe Washington (C-M) colormagphot.colorfloate_C-MError in C-Mmagstat.errorfloatM-51The Washington (M-51) colormagphot.colorfloat[Fe/H]KThe K' index metallicity measurementphys.abund.Fefloate_[Fe/H]KError in [Fe/H]Kstat.errorfloat[Fe/H]CaIThe Ca I (4227) index metallicity measurementphys.abund.Fefloate_[Fe/H]CaIError in [Fe/H]CaIstat.errorfloat[Fe/H]MgThe Mg index metallicity measurementphys.abund.Fefloate_[Fe/H]MgError in [Fe/H]Mgstat.errorfloatLum[rgsd] Luminosity classification (1)src.class.luminositycharObsMonth of the observationtime.epochnullableJ/AJ/125/2502/table7Metallicities and distances for spectroscopically confirmed giantsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGLONGalactic longitude (G1)degpos.galactic.lonGLATGalactic latitude (G1)degpos.galactic.latfloat[Fe/H]PThe photometry-derived metallicityphys.abund.Fefloate_[Fe/H]PError in [Fe/H]Pstat.errorfloat[Fe/H]SThe spectroscopy-derived metallicityphys.abund.Fefloate_[Fe/H]SError in [Fe/H]Sstat.errorfloatDistDistancekpcpos.distancefloate_DistError in Distkpcstat.errorfloatFieldField identificationobs.fieldcharChipChip numbermeta.id;instrintXpixThe X pixel coordinatepixpos.cartesian.x;instr.detintYpixThe Y pixel coordinatepixpos.cartesian.y;instr.detint