J/AJ/159/174ivo://CDS.VizieR/J/AJ/159/174doi:10.26093/cds/vizier.51590174CDSTakeda Y.Honda S.2021-09-13T14:56:49Z2020-09-30T07:39:58ZCDS support team

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

cds-question@unistra.frdwarf-starsvisible-astronomyspectroscopyeffective-temperaturechemical-abundancesIt has been suggested that Fe abundances of K dwarfs derived from FeI and FeII lines show considerable discrepancies, and oxygen abundances determined from high-excitation OI-7771-5 triplet lines are appreciably overestimated (the problem becoming more serious toward lower Teff), which, however, has not yet been widely confirmed. With the aim of clarifying this issue, we spectroscopically determined the atmospheric parameters of 148 G-K dwarfs (Hyades cluster stars and field stars) by assuming the classical FeI/FeII ionization equilibrium as usual, and determined their oxygen abundances by applying the non-local thermal equilibrium spectrum fitting analysis to OI-7771-5 lines. It turned out that the resulting parameters did not show any significant inconsistency with those determined by other methods (for example, the mean differences in Teff and logg from the well-determined solutions of Hyades dwarfs are mostly <~100K and <~0.1dex). Likewise, the oxygen abundances of Hyades stars are around [O/H]~+0.2dex (consistent with the metallicity of this cluster) without exhibiting any systematic Teff-dependence. Accordingly, we conclude that parameters can be spectroscopically evaluated to a sufficient precision in the conventional manner (based on the Saha-Boltzmann equation for FeI/FeII) and oxygen abundances can be reliably determined from the OI-7771-5 triplet for K dwarfs as far as stars of Teff>~4500K are concerned. We suspect that previously reported strongly Teff-dependent discrepancies may have stemmed mainly from overestimation of weak-line strengths and/or improper Teff scale.2020AJ....159..174Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/174CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/239 : The Hipparcos and Tycho Catalogues (ESA 1997)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/367/111 : A Hipparcos study of the Hyades cluster (de Bruijne+, 2001)J/A+A/394/927 : Age-metallicity relation for nearby stars (Ibukiyama+, 2002)J/MNRAS/336/879 : G and K dwarfs UBV(RI)c and ubvy photometry (Kotoneva+, 2002)J/A+A/402/343 : IR O I triplet, [OI] lines in F-K dwarfs/giants (Takeda,2003)J/A+A/420/183 : Spectro. survey in solar neighborhood (Allende Prieto+, 2004)J/ApJ/602/L117 : Oxygen in Pleiades and M34 dwarfs (Schuler+, 2004)J/PASJ/57/65 : CNO abundances of solar-type stars (Takeda+, 2005)J/PASJ/57/27 : Atmospheric parameters of nearby F-K stars (Takeda+, 2005)J/PASJ/59/335 : Properties of 160 F-K disk dwarfs/subgiants (Takeda+, 2007)J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)J/ApJ/735/41 : Carbon and oxygen abundances in FGK stars (Petigura+, 2011)J/MNRAS/415/563 : Elemental abundances in Hyades supercluster (De Silva+, 2011)J/ApJ/757/164 : Oxygen abundances of dwarf stars (Ramirez+, 2012)J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)J/A+A/594/A43 : APOGEE/Kepler sample stars abundances (Hawkins+, 2016)J/AJ/153/21 : Abund. in local region.II. F, G, and K dwarfs (Luck+, 2017)J/A+A/621/A112 : Carbon and oxygen in 107 dwarf stars (Pavlenko+, 2019)J/AJ/159/90 : Li, C and O abundances of FGK stars (Stonkute+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/174https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/174http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/174https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/174https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/174http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/174GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/159/174/table1 (Basic data, parameters, and abundance results of 148 program stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/159/174/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/159/174/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/159/174/table1?GETtext/xml+votable180.050000true34.332295.360740.0055555555555555566/49 60 75 100 237 272 309 322-323 334 336 342 348 357 373 610 713 814 819 890 1024 1032 1042 1058 1075 1530 1873 2149 2622 2711 3786 3979 4591 4766 5095 5191 5309 6226 6385 6953 8156 8224 8357 8424 8591 8790 9093 9354 9602 10062 10325 10914 11103 11126 11405 11412 11633 11713 11806 12388 12654 12846 12983 13025 13036 13301 13487 13568 13763 14007 14290 14512 15227 15712 16342 17607 17664 17671 17714 17731 17768 17904 18115 18299 18398 19649 19796 19836 20237 20298 21772 21838 22408 22475 22818 23017 23130 23450 23454 23479 23502-23503 23525 23527 23529 23535 23537-23539 23544-23545 23548 23774 24036 24068 24099 24104 24117 24192 24194 24206-24207 24209 24506 26183 26313 26429 26906 27374 27462 27592 28062 28400 28664 29084 30176 31130 31399 31425 32211 32318 32757 36288 36365 36735https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/159/174?format=asciiOpticaldefaultJ/AJ/159/174/table1Basic data, parameters, and abundance results of 148 program starsSimbadNameSimbad column added by the CDSmeta.idcharHIPHipparcos catalog number (1)meta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintgroupGroup; H=Hyades (47 occurrences), F=Field stars (101 occurrences)meta.notecharHDHD numbermeta.idintRAJ2000Right Ascention in decimal degrees (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000.0)degpos.eq.dec;meta.mainVmagApparent visual magnitudemagphot.mag;em.opt.VfloatVMagAbsolute visual magnitudemagphys.magAbsfloatB-VB-V color (Johnson system)magphot.color;em.opt.B;em.opt.VfloatTeffeffective temperatureKphys.temperature.effectiveintlogglog adopted spectroscopic surface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulence (2)km/sphys.veloc.microTurbfloat[Fe/H]Metallicitylog(Sun)phys.abund.ZfloatlogLlog bolometric luminositylog(solLum)phys.luminosityfloatMassMass (3)solMassphys.massfloatloggTLMlog surface gravity (4)log(cm.s**-2)phys.gravityfloatvMMacrobroadening velocitykm/sphys.velocfloat[O/H]non-LTE oxygen abundance relative to the Sunlog(Sun)phys.abundfloatdel7774non-LTE correction for OI 7774.166log(Sun)arith.factorfloatW7772equivalent width for OI 7771.944 (m{AA})1e-13mspect.line.eqWidthfloatW7774Equivalent width for OI 7774.166 (m{AA})1e-13mspect.line.eqWidthfloatW7775Equivalent width for OI 7775.388 (m{AA})1e-13mspect.line.eqWidthfloatRmMean galactocentric distancekpcpos.distance;stat.meanfloateOrbital eccentricitysrc.orbital.eccentricityfloatzmMaximum separation from the galactic planekpcpos.angDistancefloatUlsrSpace velocity in radial direction (5)km/sphys.veloc;pos.cartesian.xfloatVlsrSpace velocity in tangential direction(5)km/sphys.veloc;pos.cartesian.yfloatWlsrSpace velocity in vertical direction (5)km/sphys.veloc;pos.cartesian.zfloatv(LSR)Speed relative to LSR (6)km/sphys.velocfloatObsUT year of observationtime.epoch;obsInstObervation site/instrument (7)meta.notechar