J/ApJ/751/156ivo://CDS.VizieR/J/ApJ/751/156doi:10.26093/cds/vizier.17510156CDSBergemann M.Kudritzki R.-P.Plez B.Davies B.Lind K.Gazak Z.2017-06-20T13:17:03Z2014-02-17T09:45:55ZCDS support team

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

cds-question@unistra.frsupergiant-starsastronomical-modelsstellar-atmosphereschemical-abundancesline-intensitiesDetailed non-LTE (NLTE) calculations for red supergiant (RSG) stars are presented to investigate the influence of NLTE on the formation of atomic iron and titanium lines in the J band. With their enormous brightness at J band RSG stars are ideal probes of cosmic abundances. Recent LTE studies have found that metallicities accurate to 0.15 dex can be determined from medium-resolution spectroscopy of individual RSGs in galaxies as distant as 10 Mpc. The NLTE results obtained in this investigation support these findings. NLTE abundance corrections for iron are smaller than 0.05 dex for effective temperatures between 3400 K and 4200 K and 0.1 dex at 4400 K. For titanium the NLTE abundance corrections vary smoothly between -0.4 dex and +0.2 dex as a function of effective temperature. For both elements, the corrections also depend on stellar gravity and metallicity. The physical reasons behind the NLTE corrections and the consequences for extragalactic J-band abundance studies are discussed.2012ApJ...751..156Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/751/156CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/418/863 : NLTE corrections for Mg and Ca lines (Merle+ 2011)J/A+A/503/541 : Neutral Li in late-type stars non-LTE calc. (Lind+, 2009)J/A+A/350/955 : Atmosph. parameters in metal-poor stars. II (Gratton+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/751/156https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/751/156http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/751/156https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/751/156https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/751/156http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/751/156GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/751/156/NLTENon-LTE abundance corrections and equivalent widths of the TiI and FeI lines in red supergiantsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVtMicroturbulence velocity {xi} (2 or 5)km/sphys.veloc.microTurbintnullableTeff[3400/4400] Effective temperatureKphys.temperature.effectiveintlog(g)[-0.5/1] Log surface gravitylog(cm.s**-2)phys.gravityfloat[Z][-0.5/0.5] Metallicitylog(Sun)phys.abund.ZfloatdA(TiI)1TiI(11892.85) NLTE log(abundance) correctionarith.factorfloatdA(TiI)2TiI(11949.58) NLTE log(abundance) correctionarith.factorfloatdA(FeI)1FeI(11593.55) NLTE log(abundance) correctionarith.factorfloatdA(FeI)2FeI(11638.25) NLTE log(abundance) correctionarith.factorfloatdA(FeI)3FeI(11882.80) NLTE log(abundance) correctionarith.factorfloatdA(FeI)4FeI(11973.01) NLTE log(abundance) correctionarith.factorfloatW(TiI)1LTiI(11892) LTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(TiI)1NTiI(11892) NLTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(TiI)2LTiI(11949) LTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(TiI)2NTiI(11949) NLTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(FeI)1LFeI(11593) LTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(FeI)1NFeI(11593) NLTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(FeI)2LFeI(11638) LTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(FeI)2NFeI(11638) NLTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(FeI)3LFeI(11882) LTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(FeI)3NFeI(11882) NLTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(FeI)4LFeI(11973) LTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloatW(FeI)4NFeI(11973) NLTE equivalent width (m{AA})1e-13mspect.line.eqWidthfloat