J/A+AS/117/317ivo://CDS.VizieR/J/A+AS/117/317CDSSchuster W.J.Nissen P.E.Parrao L.Beers T.C.Overgaard L.P.1998-06-08T10:25:57Z1998-06-08T10:25:53ZCDS support team

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

cds-question@unistra.frhigh-velocity-starschemically-peculiar-starsvisible-astronomymedium-band-photometrymetallicityA catalogue of uvby-{beta} photometry for 87 of the turn-off and subgiant stars from the HK survey of Beers et al. (1992AJ....103.1987B, BPSII) is given. Most of these stars have [Fe/H]<=2.5. These photometric data have been taken and reduced using the same techniques as in our previous two uvby-{beta} catalogues (Schuster et al., 1989, Cat. <II/180> and Schuster et al., 1993, Cat. <J/A+AS/97/951>). An error analysis has been made; typical mean observational errors for a star with V=14.2m are 0.008, 0.007, 0.011, 0.010 and 0.012 in V, (b-y), m_1_, c_1_ and {beta}, respectively. Our photometric data are also compared to the UBV photometry and spectral indices from the HK survey; satisfactory agreement is found indicating good quality for the two data sets. The stars are classified in reddening-free diagrams of the uvby-{beta} system; several of the stars are found to have been mis-classified in the HK survey. Two metal-poor supergiants, three (possibly four) horizontal branch stars, one blue subluminous star and two stars with ambiguous photometry have been identified. Stellar parameters, such as E(b-y), M_V_, {delta}M_V_, and T_eff_, plus error estimates for these parameters, are provided using our photometric calibrations. Although all stars have galactic latitudes |b|>=30{deg} many of them are significantly reddened with E(b-y) ranging from 0.02 to 0.15. The average reddening towards the South Galactic Pole region, b<-60{deg}, is E(b-y)=0.027+/-0.004 corresponding to E(B-V)=0.036+/-0.005 in contrast to the low value of E(B-V)~0.01 derived from the Burstein & Heiles (1982AJ.....87.1165B) maps. The stars are analyzed in the (b-y)_0_, [Fe/H] diagram, and individual ages estimated using the isochrones of VandenBerg & Bell (1985ApJS...58..561V) and of Bergbusch & VandenBerg (1992ApJS...81..163B). These very metal-poor stars are found to be coeval, within 1-2Gyr, with the halo and thick-disk stars studied previously, with a mean age in excess of 18Gyr. Several blue "thick-disk" stars, which are perhaps analogous to the "blue metal-poor" stars of Preston et al. (1994, Cat. <J/AJ/108/538>), have been identified.1996A&AS..117..317Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/117/317CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/180 : uvby-beta photometry of metal-poor stars. III. (Schuster+ 1989)J/A+AS/97/951 : uvby-beta photometry of metal-poor stars. VI. (Schuster+ 1993)J/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992)J/A+A/422/527 : Metal-poor stars uvby-beta photometry. X. (Schuster+, 2004)J/A+A/445/939 : Metal-poor stars uvby-beta photometry. XI. (Schuster+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/117/317https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/117/317http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/117/317https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/117/317https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/117/317http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/117/317GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+AS/117/317/table1The standard uvby-{beta} catalogue for the 87 BPSII (Beers et al., 1992AJ....103.1987B) starsNoteNotemeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar designation according to BPSII (Beers et al., 1992AJ....103.1987B)meta.id;meta.maincharprimaryVmagV magnitudemagphot.mag;em.opt.Bfloatb-yb-y colour indexmagphot.color;em.opt.B;em.opt.Vfloatm1m1 colour indexmagphot.colorfloatc1c1 colour indexmagphot.colorfloato_b-yNumber of independent uvby observationsmeta.numberintbetabeta colour indexmagspect.indexfloato_betaNumber of independent beta observationsmeta.numberintJ/A+AS/117/317/table2Stellar parameters for the 86 VMP stars.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar designation according to BPSII (Beers et al., 1992AJ....103.1987B)meta.id;meta.maincharprimaryE(b-y)? Reddeningmagphot.color.excessfloatnullablee_E(b-y)? rms uncertainty on E(b-y)magstat.errorfloatnullable[Fe/H]c? Spectroscopic metallicitylog(Sun)phys.abund.Fefloatnullable[Fe/H]p? Photometric metallicitylog(Sun)phys.abund.Fefloatnullableu_[Fe/H]pUncertainty flag on [Fe/H]pmeta.code.errorchare_[Fe/H]p? rms uncertainty on [Fe/H]plog(Sun)stat.errorfloatnullableMV? Absolute V magnitudemagphys.magAbs;em.optfloatnullablee_MV? rms uncertainty on MVmagstat.errorfloatnullabledMV? Evolutionnary correction {delta}MV (See Nissen et al., 1991A&A...251..457N)magstat.fit.omc;phot.magfloatnullablee_dMV? rms uncertainty on dMVmagstat.errorfloatnullableTeff? Effective temperatureKphys.temperature.effectiveintnullablee_Teff? rms uncertainty on TeffKstat.errorintnullable