J/AJ/109/1095ivo://CDS.VizieR/J/AJ/109/1095doi:10.26093/cds/vizier.51091095CDSGilmore G.Wyse R.F.G.Jones J.B.2023-04-06T16:50:09Z2000-04-14T21:02:19ZCDS support team

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

cds-question@unistra.frvisible-astronomyphotographic-photometrystellar-distanceeffective-temperatureWe present a determination of the thick disk iron abundance distribution obtained from an in situ sample of F/G stars. These stars are faint, 15<=V=<18, selected on the basis of color, being a subset of the larger survey of Gilmore and Wyse designed to determine the properties of the stellar populations several kiloparsecs from the Sun. The fields studied in the present paper probe the iron abundance distribution of the stellar populations of the galaxy at 500-3000pc above the plane, at the solar Galactocentric distance. The derived chemical abundance distributions are consistent with no metallicity gradients in the thick disk over this range of vertical distance, and with an iron abundance distribution for the thick disk that has a peak at -0.7dex. The lack of a vertical gradient argues against slow, dissipational settling as a mechanism for the formation of the thick disk. The photometric and metallicity data support a turn-off of the thick disk that is comparable in age to the metal-rich globular clusters, or >=12Gyr, and are consistent with a spread to older ages.1995AJ....109.1095Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/109/1095CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/109/1095https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/109/1095http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/109/1095https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/109/1095https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/109/1095http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/109/1095GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/109/1095/table2 (Observed and derived data for South Galactic Pole stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/109/1095/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/109/1095/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/109/1095/table2?GETtext/xml+votable180.050000true12.5220512-28.95315380.005555555555555556Cone search capability for table J/AJ/109/1095/table4 (Observed and derived data for UK Schmidt Field 117 stars (l, b)=(270, -45))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/109/1095/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/109/1095/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/109/1095/table4?GETtext/xml+votable180.050000true55.2779453-59.13092840.0055555555555555565/8939 6/33251 33254-33255 33257-33260 33262 33601 35750-35751 35753 35755 35768-357703.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/109/1095?format=asciiOpticaldefaultJ/AJ/109/1095/table2Observed and derived data for South Galactic Pole starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right ascension 1950.0pos.eq.ra;meta.mainDE1950Declination 1950.0pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatB-VB-V color indexmagphot.color;em.opt.B;em.opt.VfloatV-IV-I color indexmagphot.color;em.opt.V;em.opt.Ifloat[Fe/H]MetallicitySunphys.abund.ZfloatDistDistance from photometric parallaxpcpos.distanceintTeffEffective temperature from V-IKphys.temperature.effectiveint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/AJ/109/1095/table4Observed and derived data for UK Schmidt Field 117 stars (l, b)=(270, -45)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right ascension 1950.0pos.eq.ra;meta.mainDE1950Declination 1950.0pos.eq.dec;meta.mainVmagV magnitudemagphot.mag;em.opt.VfloatB-VB-V color indexmagphot.color;em.opt.B;em.opt.VfloatV-IV-I color indexmagphot.color;em.opt.V;em.opt.Ifloat[Fe/H]MetallicitySunphys.abund.ZfloatDistDistance from photometric parallaxpcpos.distanceintTeffEffective temperature from V-IKphys.temperature.effectiveint_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed