J/A+A/300/751ivo://CDS.VizieR/J/A+A/300/751doi:10.26093/cds/vizier.33000751CDSAXER M.FUHRMANN K.GEHREN T.1999-02-26T14:03:00Z1999-02-26T15:02:49ZCDS support team

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

cds-question@unistra.frchemically-peculiar-starsstellar-massesstellar-distanceModels of post-main sequence stellar evolution of VandenBerg & Bell have been applied to determine spectroscopic masses and distances for metal-poor stars. Careful consideration of the most important error sources published in more recent papers such as VandenBerg for the first time allow us to draw firm statistical conclusions. It is shown that the evolutionary calculations qualitatively fit to the observed stellar parameters whereas quantitatively they predict too high ages for metal-poor stars. As an important result we confirm that evolutionary sequences need to be calibrated with respect to their metal abundance in order to use their absolute predictions of temperature and luminosity. In our spectroscopic analyses the strong dependence between surface gravity and abundances determined from Fe I lines restricts the accuracy of Fe abundances in subgiants to 0.1 dex at best. The most remarkable result of our evolutionary and kinematic investigations of halo stars refers to the large fraction of slightly evolved subgiants among the so-called subdwarfs. Since conventional photometric approaches often assume that the great majority of metal-poor stars are dwarfs this results in distances that are systematically too low for their samples.1995A&A...300..751Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/300/751CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/300/751https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/300/751http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/300/751https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/300/751https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/300/751http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/300/751GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/300/751/table1Fundamental stellar parameters of the program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD numbermeta.idcharGGiclas numbermeta.idcharNameOther namemeta.idcharTeffEffective temperature for LTE assumptionKphys.temperature.effectiveintlogg1Surface gravity for LTE assumptionlog(cm.s**-2)phys.gravityfloat[Fe/H]1Metallicity for LTE assumptionlog(Sun)phys.abund.FefloatClassSubdivision in three classes of LTE assumptionsrc.classcharDloggNon-LTE correction in logglog(cm.s**-2)stat.paramfloatD[Fe/H]non-LTE correction in [Fe/H]log(Sun)stat.paramfloatlogg2Surface gravity for non-LTE assumptionlog(cm.s**-2)phys.gravityfloate_logg1rms uncertainty on log g1 (LTE value)log(cm.s**-2)stat.errorfloat[Fe/H]2Metallicity for non-LTE assumptionlog(Sun)phys.abund.Fefloate_[Fe/H]1rms uncertainty on [Fe/H]1 (LTE value)log(Sun)stat.errorfloatJ/A+A/300/751/table3Stellar parameters derived from spectroscopy assuming LTENameOther namemeta.idcharHDHd numbermeta.idcharGGiclas numbermeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintD(log(Teff))Temperature corrections necessary for individual adjustment to the metal abundancelog(K)arith.factor;phys.temperature.effectivefloatBCBolometric correctionmagphot.mag.bcfloatMassMasssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.errorfloatplxSpectroscopic parallaxarcsecpos.parallax.spectfloate_plxrms uncertainty on plxarcsecstat.errorfloatDistDistancepcpos.distanceinte_Distrms uncertainty on distancepcstat.errorintMVAbsolute visual magnitudemagphys.magAbs;em.optfloate_MVrms uncertainty on MVmagstat.errorfloatMbolBolometric magnitudemagphot.mag.bolfloate_Mbolrms uncertainty on Mbolmagstat.errorfloatJ/A+A/300/751/table4Stellar parameters derived from spectroscopy including non-LTE correctionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHd numbermeta.idcharGGiclas numbermeta.idcharNameOther namemeta.idcharD(log(Teff))Temperature corrections necessary for individual adjustment to the metal abundancelog(K)arith.factor;phys.temperature.effectivefloatBCBolometric correctionmagphot.mag.bcfloatMassMasssolMassphys.massfloate_Massrms uncertainty on MasssolMassstat.errorfloatplxSpectroscopic parallaxarcsecpos.parallax.spectfloate_plxrms uncertainty on plxarcsecstat.errorfloatDistDistancepcpos.distanceinte_Distrms uncertainty on distancepcstat.errorintMVAbsolute visual magnitudemagphys.magAbs;em.optfloate_MVrms uncertainty on MVmagstat.errorfloatMbolBolometric magnitudemagphot.mag.bolfloate_Mbolrms uncertainty on Mbolmagstat.errorfloatJ/A+A/300/751/table5Galactic velocitiesHDHD numbermeta.idcharGGiclas numbermeta.idcharNameOther namemeta.idcharRVRadial velocitykm/sphys.veloc;pos.heliocentricintW2W velocity for non-LTE assumptionkm/sphys.velocintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintpmRAproper motion in right ascensions/yrpos.pm;pos.eq.rafloatpmDEProper motion in declinationarcsec/yrpos.pm;pos.eq.decfloatU1U velocity for LTE assumptionkm/sphys.velocintV1V velocity for LTE assumptionkm/sphys.velocintW1W velocity for LTE assumptionkm/sphys.velocintVgal1Galactic velocity for LTE assumptionkm/sphys.velocinte_Vgal1rms uncertainty on Vgal1km/sstat.errorintU2U velocity for non-LTE assumptionkm/sphys.velocintV2V velocity for non-LTE assumptionkm/sphys.velocintVgal2Galactic velocity for non-LTE assumptionkm/sphys.velocinte_Vgal2rms uncertainty on Vgal2km/sstat.errorint