J/A+A/555/A12ivo://CDS.VizieR/J/A+A/555/A12doi:10.26093/cds/vizier.35550012CDSKordopatis G.Hill V.Irwin M.Gilmore G.Wyse R.F.G.Tolstoy E.,de Laverny P.Recio-Blanco A.Battaglia G.Starkenburg E.2017-06-01T08:52:49Z2013-06-19T08:59:00ZCDS support team

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

cds-question@unistra.frmilky-way-galaxystellar-distanceeffective-temperaturemetallicityradial-velocityWe study the chemical and kinematic properties of roughly a thousand FLAMES-GIRAFFE LR8 spectra of faint magnitude foreground Galactic stars observed serendipitously during extra-galactic surveys in four lines-of-sight: three in the southern Galactic hemisphere (surveys of the Carina, Fornax and Sculptor dwarf spheroidal galaxies) and one in the northern Galactic hemisphere (a survey of the Sextans dwarf spheroidal galaxy). The foreground stars span distances up to ~3kpc from the Galactic plane and Galactocentric radii up to 11kpc. The stellar atmospheric parameters (effective temperature, surface gravity, metallicity) are obtained by an automated parameterisation pipeline and the distances of the stars are then derived by a projection of the atmospheric parameters on a set of theoretical isochrones using a Bayesian approach. The metallicity gradients are estimated for each line-of-sight and compared with predictions from the Besancon model of the Galaxy, in order to test the chemical structure of the thick disc. Finally, we use the radial velocities in each line-of-sight to derive a proxy for either the azimuthal or the vertical component of the orbital velocity of the stars. Only three lines-of-sight have a sufficient number of foreground stars for a robust analysis. Towards Sextans in the Northern Galactic hemisphere and Sculptor in the South, we measure a consistent decrease in mean metallicity with height from the Galactic plane, suggesting a chemically symmetric thick disc. This decrease can either be due to an intrinsic thick disc metallicity gradient, or simply due to a change in the thin disc/thick disc population ratio and no intrinsic metallicity gradients for the thick disc. We favour the latter explanation. In contrast, we find evidence of an unpredicted metal-poor population in the direction of Carina. This population was earlier detected by Wyse et al. (2006ApJ...639L..13W), but our more detailed analysis provides robust estimates of its location (|Z|<1kpc), metallicity (-2<[M/H]<-1dex) and azimuthal orbital velocity (V_phi_~120km/s).2013A&A...555A..12Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/555/A12CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/131/895 : Stars in the Carina dwarf spheroidal galaxy (Koch+, 2006)J/MNRAS/383/183 : CaII triplet of RGB from VLT/FLAMES obs. (Battaglia+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/555/A12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/555/A12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/555/A12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/555/A12https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/555/A12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/555/A12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/555/A12/stars (Atmospheric parameters, positions, radial velocities, magnitudes and distances of the selected faint foreground galactic stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/555/A12/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/555/A12/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/555/A12/stars?GETtext/xml+votable180.050000true14.3761-33.79090.0055555555555555565/8992 6/27203 27205-27207 27212-27213 27215 27218-27219 27222 27224 35543 35549-35551 35714-35715 35720-35722 35882-35883 35972 39091 39094 39097 391003.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/555/A12?format=asciiOpticaldefaultJ/A+A/555/A12/starsAtmospheric parameters, positions, radial velocities, magnitudes and distances of the selected faint foreground galactic starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification of the star according to its line-of-sight (G1)meta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVmagV apparent magnitudemagphot.mag;em.opt.Vfloat(V-I)V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatHRVHeliocentric Radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRVError on the heliocentric radial velocitykm/sstat.errorfloatDistLine-of-sight distancepcpos.distance;pos.heliocentricinte_DistError on the line-of-sight distancepcstat.errorintTeff1Effective temperature (2)Kphys.temperature.effectiveintTeff2Effective temperature once projected on the Yonsei-Yale isochronesKphys.temperature.effectiveinte_Teff2Error on the effective temperatureKstat.errorintlogg1Logarithmic surface gravity (2)log(cm.s**-2)phys.gravityfloatlogg2Logarithmic surface gravity from isochroneslog(cm.s**-2)phys.gravityfloate_logg2Error on the logarithmic surface gravitylog(cm.s**-2)stat.errorfloat[M/H]1[-3.4/0.5] Overall metallicity (2)log(Sun)phys.abund.Fefloat[M/H]2[-4.0/0.3] Overall calibrated metallicity after applying the calibration of Kordopatis et al. 2013 (in preparation)log(Sun)phys.abund.Fefloate_[M/H]2Error on metallicitylog(Sun)stat.error;phys.abundfloatSimbadSimbad column added by the CDSmeta.ref.urlchar