J/ApJ/819/103ivo://CDS.VizieR/J/ApJ/819/103doi:10.26093/cds/vizier.18190103CDSAfsar M.Sneden C.Frebel A.Kim H.Mace G.N.Kaplan K.F.Lee H.-I.,Oh H.Oh J.S.Pak S.Park C.Pavel M.D.Yuk I.-S.Jaffe D.T.2017-01-23T22:00:00Z2016-06-21T13:03:23ZCDS support team

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

cds-question@unistra.frchemical-abundancesline-intensitiesinfrared-astronomyspectroscopyhalo-starsFrom high resolution (R~=45000), high signal-to-noise ratio (S/N>400) spectra gathered with the Immersion Grating Infrared Spectrograph (IGRINS) in the H and K photometric bands, we have derived elemental abundances of two bright, well-known metal-poor halo stars: the red giant HD 122563 and the subgiant HD 140283. Since these stars have metallicities approaching [Fe/H]=-3, their absorption features are generally very weak. Neutral-species lines of Mg, Si, S and Ca are detectable, as well as those of the light odd-Z elements Na and Al. The derived IR-based abundances agree with those obtained from optical-wavelength spectra. For Mg and Si the abundances from the infrared transitions are improvements to those derived from shorter wavelength data. Many useful OH and CO lines can be detected in the IGRINS HD 122563 spectrum, from which derived O and C abundances are consistent to those obtained from the traditional [OI] and CH features. IGRINS high resolutions H- and K-band spectroscopy offers promising ways to determine more reliable abundances for additional metal-poor stars whose optical features are either not detectable, or too weak, or are based on lines with analytical difficulties.2016ApJ...819..103Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/819/103CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/584/A86 : Abundance analysis of HD 140283 (Siqueira-Mello+, 2015)J/A+A/577/A18 : Reduced CRIRES spectra around S multiplet 3 (Kacharov+, 2015)J/A+A/575/A26 : The Population II star HD 140283 data (Creevey+, 2015)J/ApJS/215/23 : FeI branching fractions (Den Hartog+, 2014)J/ApJS/214/26 : Line lists for CN isotopes transitions (Sneden+, 2014)J/MNRAS/441/3127 : FeI oscillator strengths for Gaia-ESO (Ruffoni+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJS/208/27 : Sun and HD 84937 TiII log(gf) and abundances (Wood+, 2013)J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)J/A+A/548/A42 : HD 140283 average spectrum (370-1040nm) (Siqueira Mello+ 2012)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/ApJ/742/54 : CASH project II. 14 extremely metal-poor stars (Hollek+, 2011)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/A+A/415/993 : FeII, ZNI and SI abundances on halo stars (Nissen+, 2004)J/ApJ/530/783 : The r-process enriched giant HD 115444 (Westin+, 2000)J/ApJS/95/535 : Infrared CO line list for X 1{Sigma}+ state (Goorvitch, 1994)J/AJ/90/2089 : Stars of very low metal abundance. I (Beers+, 1985)http://www.sdss3.org/surveys/apogee.php : APOGEE home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/819/103https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/819/103http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/819/103https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/819/103https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/819/103http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/819/103GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/819/103/table1 (Program star parameters and observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/819/103/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/819/103/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/819/103/table1?GETtext/xml+votable180.050000true210.632708339.686097220.0055555555555555566/26457 44542https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/819/103?format=asciiInfrareddefaultJ/ApJ/819/103/table3Parameters of other species linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3905.5/23447.8] Wavelength in Angstroms, in air units0.1nmem.wldoubleIonSpecies identificationphys.atmol.ionStagecharchi[0/8.1] Lower excitation leveleVphys.atmol.excitation;phys.atmol.leveldoublelog(gf)[-10.2/4.9] Oscillator strengthphys.atmol.oscStrengthfloatEW-1[1.5/237]? Equivalent width, HD 122563 (m{AA})0.1pmspect.line.eqWidthfloatnullablef_EW-1[s] s: spectrum synthesis measurementmeta.codecharEW-2[2.8/169.8]? Equivalent width, HD 140283 (m{AA})0.1pmspect.line.eqWidthfloatnullablef_EW-2[s] s: spectrum synthesis measurementmeta.codechar[X/Fe]1[-0.7/1.1]? Relative abundance, HD 122563 (G1)phys.abundfloatnullable[X/Fe]2[-1/0.8]? Relative abundance, HD 140283 (G1)phys.abundfloatnullableJ/ApJ/819/103/table1Program star parameters and observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar Name \linkRole{SIMBAD object}meta.id;meta.maincharRAJ2000SIMBAD Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000SIMBAD Degree of Declination (J2000) (1)pos.eq.dec;meta.mainVmag[6.1/7.3] SIMBAD V magnitude (1)magphot.mag;em.opt.VfloatHmag[3.7/5.7] SIMBAD H magnitude (1)magphot.mag;em.IR.HfloatKmag[3.7/5.6] SIMBAD K magnitude (1)magphot.mag;em.IR.KfloatExp[960] Total Exposure timestime.duration;obs.exposureintl_S/NUpper limit flag on S/Nmeta.code.errorcharS/N[400] Signal to Noisestat.snrintEWsDisplay the equivalent width measurements for this starmeta.ref.urlcharJ/ApJ/819/103/table2Parameters of Fe and Ti lineschi[0/4.7] Lower excitation leveleVphys.atmol.excitation;phys.atmol.leveldoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[4394/7946] Wavelength in Angstroms, in air units0.1nmem.wldoubleIonSpecies identification (Fe I, Fe II, Ti I or Ti II)phys.atmol.ionStagecharlog(gf)[-5.5/0.6] Log of the oscillator strengthphys.atmol.oscStrengthdoubleEW-1[1/168] HD 122563 equivalent width, milli-Angstroms0.1pmspect.line.eqWidthdoubleEW-2[1/109]? HD 140283 equivalent width (m{AA})0.1pmspect.line.eqWidthdoublenullable[X/Fe]1[-3.3/0.4] Relative abundance, HD 122563 (G1)phys.abunddouble[X/Fe]2[-2.9/0.5]? Relative abundance, HD 140283 (G1)phys.abunddoublenullable