J/ApJ/602/L117ivo://CDS.VizieR/J/ApJ/602/L117doi:10.26093/cds/vizier.16029117CDSSchuler S.C.King J.R.Hobbs L.M.Pinsonneault M.H.2004-12-19T15:32:30Z2004-12-19T16:32:22ZCDS support team

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

cds-question@unistra.fropen-star-clusterslate-type-starspopulation-ii-starschemical-abundancesWe analyze the high-excitation O I {lambda}7774 triplet in high-resolution, moderate signal-to-noise ratio spectra of 15 Pleiades and eight M34 open cluster dwarfs over the effective temperature range of 5048-6172K. Relative O abundances have been derived using model atmospheres interpolated from four different sets of ATLAS9 grids. In contrast to existing non-LTE (NLTE) predictions, a dramatic increase in the O I triplet abundance with decreasing temperature is seen for both clusters, regardless of the atmospheric model. S I abundances of three Pleiades stars derived from the high-excitation {lambda}6053 feature mimic the O I abundance behavior. O abundances have also been derived from the [O I] {lambda}6300 feature in three Pleiades stars; the abundances exhibit a much lower mean value than do the cool dwarf triplet results. Inasmuch as the [O I] abundances are presumed to be free from NLTE effects, their mean values ([O/H]_6300_=+0.14) provide the current best estimate of the Pleiades O abundance. Spreads in [O/H]_Trip_ at a given temperature are also seen in both clusters; no correlation is found between the spreads and the chromospheric emission measures.2004ApJ...602L.117Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/602/L117CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/193 : Chemical Abundances in Late-Type Stars (Thevenin, 1998)J/AJ/106/1059 : Lithium in the Pleiades (Soderblom+, 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/602/L117https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/602/L117http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/602/L117https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/602/L117https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/602/L117http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/602/L117GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/602/L117/table1 (Parameters and Abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/602/L117/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/602/L117/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/602/L117/table1?GETtext/xml+votable180.050000true55.96558324.2378060.0055555555555555566/461 463 472 474 496 2395https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/602/L117?format=asciiOpticaldefaultJ/ApJ/602/L117/table1Parameters and AbundancesCNameCluster namecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intNameObject namecharB-V? The (B-V)_0_ colormagfloatnullableTeffEffective temperatureKintxiMicroturbulant velocitykm/sfloatlog(g)Log of the surface gravitylog(cm.s**-2)floatEW7771? The 7771 triplet equivalent width (1)0.1pmfloatnullableEW7774? The 7774 triplet equivalent width (1)0.1pmfloatnullableEW7775? The 7775 triplet equivalent width (1)0.1pmfloatnullableOVERThe OVER [O/H] abundance (2)log(Sun)floatf_OVER[b] Indicates all abundances are log(N(O))charNOVERThe NOVER [O/H] abundance (2)log(Sun)floatMLT5The MLT5 [O/H] abundance (2)log(Sun)floatCGM72The CGM72 [O/H] abundance (2)log(Sun)floatLinkAsk the Simbad data-base about this objectchar_RAPosition (from SIMBAD) (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition (from SIMBAD) (declination part)degpos.eq.dec;meta.mainnullable