J/ApJ/757/164ivo://CDS.VizieR/J/ApJ/757/164doi:10.26093/cds/vizier.17570164CDSRamirez I.Melendez J.Chaname J.2017-12-07T07:27:44Z2014-07-16T11:20:24ZCDS support team

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

cds-question@unistra.frchemical-abundancesdwarf-starshalo-starseffective-temperatureOxygen abundances of 67 dwarf stars in the metallicity range -1.6<[Fe/H]<-0.4 are derived from a non-LTE analysis of the 777nm OI triplet lines. These stars have precise atmospheric parameters measured by Nissen and Schuster (Cat. J/A+A/511/L10), who find that they separate into three groups based on their kinematics and {alpha}-element (Mg, Si, Ca, Ti) abundances: thick disk, high-{alpha} halo, and low-{alpha} halo. We find the oxygen abundance trends of thick-disk and high-{alpha} halo stars very similar. The low-{alpha} stars show a larger star-to-star scatter in [O/Fe] at a given [Fe/H] and have systematically lower oxygen abundances compared to the other two groups. Thus, we find the behavior of oxygen abundances in these groups of stars similar to that of the {alpha} elements. We use previously published oxygen abundance data of disk and very metal-poor halo stars to present an overall view (-2.3<[Fe/H]<+0.3) of oxygen abundance trends of stars in the solar neighborhood. Two field halo dwarf stars stand out in their O and Na abundances. Both G53-41 and G150-40 have very low oxygen and very high sodium abundances, which are key signatures of the abundance anomalies observed in globular cluster (GC) stars. Therefore, they are likely field halo stars born in GCs. If true, we estimate that at least 3%+/-2% of the local field metal-poor star population was born in GCs.2012ApJ...757..164Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/757/164CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)J/ApJ/735/41 : Carbon and oxygen abundances in FGK stars (Petigura+, 2011)J/A+A/511/L10 : Abundances and space velocities of 94 stars (Nissen+, 2010)J/A+A/465/271 : Oxygen abundances in nearby stars (Ramirez+, 2007)J/A+A/402/343 : IR OI triplet, [O I] lines in F-K dwarfs/giants (Takeda, 2003)J/ApJ/595/1154 : Oxygen abundances in metal-poor stars (Fulbright+, 2003)J/A+A/390/235 : OI & FeII equivalent widths in metal-poor stars (Nissen+ 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/757/164https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/757/164http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/757/164https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/757/164https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/757/164http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/757/164GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/757/164/table1 (Stellar parameters and oxygen abundances of stars from the sample of Nissen and Schuster (2010, Cat. J/A+A/511/L10))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/757/164/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/757/164/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/757/164/table1?GETtext/xml+votable180.050000true51.749051723.77665030.0055555555555555566/200 208 373 436 488 1053 5413 5622 7334 8235 9537 9831 10313 12451 12793 17136 17245 17332 17726 17782 18053 19347 19385 21926 22118 22754 22909 23015 23096 23978 24775 24824 24827 24942 25444 27394 27975 28265 29490 29596 29765 30196 30233 30296 31470 31503 31874 32100 32335 33273 33508 37232 38072 38288 38986 39157 39647 39692 40716 41721 43310 43641 44281 44653 46053 48394 48736https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/757/164?format=asciiOpticaldefaultJ/ApJ/757/164/table1Stellar parameters and oxygen abundances of stars from the sample of Nissen and Schuster (2010, Cat. J/A+A/511/L10)NameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintm_NameMultiplicity index on Namemeta.code.multipcharTeffEffective temperature (1)Kphys.temperature.effectiveintlog(g)Log of the surface gravity (1)log(cm.s**-2)phys.gravityfloat[Fe/H]Metallicity (1)log(Sun)phys.abund.Zfloat[O/H]LTE derived log O/H abundancelog(Sun)phys.abundfloate_[O/H]Uncertainty in [O/H]log(Sun)stat.error;phys.abundfloat[O/Fe]LTE derived log O/Fe abundancelog(Sun)phys.abundfloate_[O/Fe]Uncertainty in [O/Fe]log(Sun)stat.error;phys.abundfloat[O/H]NNLTE derived log O/H abundancelog(Sun)phys.abundfloate_[O/H]NUncertainty in [O/H]Nlog(Sun)stat.error;phys.abundfloat[O/Fe]NNLTE derived log O/Fe abundancelog(Sun)phys.abundfloate_[O/Fe]NUncertainty in [O/Fe]Nlog(Sun)stat.error;phys.abundfloata/FeThe {alpha}/Fe abundance description (high, low, or tdk=thick disk star) (1)meta.note;phys.abundcharSourceSource of the data (reference and/or instrument) (2)meta.ref;pos.framecharOCatCross-match within 5" with Ramirez et al. 2007 (J/A+A/465/271) and Nissen et al. 2002 (J/A+A/390/235)meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main