J/AJ/126/1362ivo://CDS.VizieR/J/AJ/126/1362doi:10.26093/cds/vizier.51261362CDSBrown W.R.Allende Prieto C.Beers T.C.Wilhelm R.Geller M.J.,Kenyon S.J.Kurtz M.J.2023-04-06T16:50:56Z2004-02-19T21:03:27ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyphotometrymetallicityradial-velocityThe Century Survey Galactic Halo Project is a photometric and spectroscopic survey from which we select relatively blue stars (V-R<0.30mag) as probes of the Milky Way halo. The survey strip spans the range of Galactic latitude 35{deg}<b<88{deg}, allowing us to study the nature of populations of stars and their systematic motions as a function of Galactic latitude. One of our primary goals is to use blue horizontal-branch stars to trace potential star streams in the halo, and to test the hierarchical model for the formation of the Galaxy. In this paper we discuss spectroscopy and multipassband photometry for a sample of 764 blue stars in the Century Survey region. Our sample consists predominantly of A- and F-type stars. We describe our techniques for determination of radial velocities, effective temperatures, metallicities, and surface gravities. Based on these measurements, we derive distance estimates by comparison with a set of calibrated isochrones. We devote special attention to the classification of blue horizontal-branch stars, and compare the results obtained from the application of the techniques of Kinman et al. 1994, Cat. <J/AJ/108/1722>, Wilhelm et al. (1999, Cat. <J/AJ/117/2308>), and Clewley et al. (2002MNRAS.337...87C). We identify 55 blue horizontal-branch stars. Our large sample of stars also uncovers a number of unusual objects, including three carbon-enhanced stars, a late B-type star located 0.8kpc above the Galactic plane, and a DZ white dwarf.2003AJ....126.1362Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/126/1362CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/130/1097 : Century Survey Galactic Halo Project. II. (Brown+, 2005)J/AJ/108/1722 : Blue horizontal branch stars (Kinman+ 1994)J/AJ/117/2308 : Spectroscopy of hot stars in the halo (Wilhelm+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/126/1362https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/126/1362http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/126/1362https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/126/1362https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/126/1362http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/126/1362GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/126/1362/table6 (Unusual objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/126/1362/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/126/1362/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/126/1362/table6?GETtext/xml+votable180.050000true174.05833329.0250.005555555555555556Cone search capability for table J/AJ/126/1362/table7 (Photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/126/1362/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/126/1362/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/126/1362/table7?GETtext/xml+votable180.050000true157.55541729.3402780.0055555555555555565/1151 1231 1235-1236 1240 1251-1252 1300 1304 2602 6/4599 4603 4919 4921 4923 4935 4939 4948-4950 4952 4954 4964-4966 4968-4970 4999 5012-5014 5016-5017 5175 5177 5179 5181-5183 5191 5197-5199 5204 5206 5208-5210 5220-5222 5224-5226 5255 5259 5261-5264 5266-5268 5272 5281-5286 5288-5290 10302-10303 10346 10381-10383 10385-10390 10392-10394 10401 10403-10406 28157-28159 28409 28411 28413-28415 28477-28479 28493 28495 28497 28499-28502 28504-28506 28508 28513 28515-28516 28518 28520-28522 28524 28557-28559 28561 28563-28566 28568-28569 28572 28577-28582 28584-28586 28592 28608https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/126/1362?format=asciiOpticaldefaultJ/AJ/126/1362/table3Comparison with Kinman et al. (1994, Cat. <J/AJ/108/1722>)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStellar identification (G1)meta.id;meta.maincharprimaryBJA0This work's BJA_0_ spectrophotometric index (1)magphot.flux;arith.ratiofloatL0? This work's {lambda}_0_ parameter (2)0.1nmphot.flux;arith.ratiofloatnullableK-BJA0Kinman et al. (1994, <J/AJ/108/1722>) BJA_0_ spectrophotometric index (1)magphot.flux;arith.ratiofloatK-L0Kinman et al. (1994, <J/AJ/108/1722>) {lambda}_0_ parameter (2)0.1nmphot.flux;arith.ratiofloatJ/AJ/126/1362/table4The Blue Horizontal Branch (BHB) SelectionB-VThe (B-V)_0_ colormagphot.color;em.opt.B;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCHSSCHSS number (G2)meta.id;meta.mainintprimarySpTypeSpectral type from this worksrc.spTypefloate_SpTypeError in SpTypestat.errorfloatBJA0The BJA_0_ spectrophotometric indexmagphot.flux;arith.ratiofloate_BJA0Error in BJA0magstat.errorfloatBHB1Classified as BHB by the modified Kinman et al. (1994, Cat. <J/AJ/108/1722>) method (2)meta.codeintTeffEffective temperatureKphys.temperature.effectiveinte_TeffError in TeffKstat.errorintlog(g)Log of the surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)Error in log(g)log(cm.s**-2)stat.errorfloatBHB2Classified as BHB by the Wilhelm et al. (1999, Cat. <J/AJ/117/2308>) method (2)meta.codeinte_B-VError in B-Vmagstat.errorfloatD0.15D_0.15_ value from the Sersic profile fit0.1nmstat.fit.paramfloate_D0.15Error in D0.150.1nmstat.errorfloatBHB3Classified as BHB by the Clewley et al. (2002MNRAS.337...87C) D_0.15_-color method (2)meta.codeintcThe power of the Sersic profile fitstat.fit.paramfloate_cError in cstat.errorfloatbScale length of the Sersic profile fit in Angstroms0.1nmstat.fit.paramfloate_bError in b0.1nmstat.errorfloatBHB4Classified as BHB by the Clewley et al. (2002MNRAS.337...87C) Scale width - Shape method (2)meta.codeintTotSum of the four BHB classification methods (3)meta.code.classintJ/AJ/126/1362/table5The BHB standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStellar identification (G1) (1)meta.id;meta.maincharprimarySpTypeSpectral type from this worksrc.spTypefloate_SpTypeError in SpTypestat.errorfloatBJA0The BJA_0_ spectrophotometric indexmagphot.flux;arith.ratiofloate_BJA0Error in BJA0magstat.errorfloatBHB1Classified as BHB by the modified Kinman et al. (1994, Cat. <J/AJ/108/1722>) method (2)meta.codeintTeffEffective temperatureKphys.temperature.effectiveinte_TeffError in TeffKstat.errorintlog(g)Log of the surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)Error in log(g)log(cm.s**-2)stat.errorfloatBHB2Classified as BHB by the Wilhelm et al. (1999, Cat. <J/AJ/117/2308>) method (2)meta.codeintB-VThe (B-V)_0_ colormagphot.color;em.opt.B;em.opt.Vfloate_B-VError in B-Vmagstat.errorfloatD0.15D_0.15_ value from the Sersic profile fit0.1nmstat.fit.paramfloate_D0.15Error in D0.150.1nmstat.errorfloatBHB3Classified as BHB by the Clewley et al. (2002MNRAS.337...87C) D_0.15_-color method (2)meta.codeintcThe power of the Sersic profile fitstat.fit.paramfloate_cError in cstat.errorfloatbScale length of the Sersic profile fit in Angstroms0.1nmstat.fit.paramfloate_bError in b0.1nmstat.errorfloatBHB4Classified as BHB by the Clewley et al. (2002MNRAS.337...87C) Scale width - Shape method (2)meta.codeintTotSum of the four BHB classification methods (3)meta.code.classintClassClassificationsrc.classcharJ/AJ/126/1362/table6Unusual objectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCHSSCHSS number (G2)meta.id;meta.mainintprimaryClassClassificiationsrc.classcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainVmag? V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? rms uncertainty on Vmagmagstat.errorfloatnullableV-R? V-R colour indexmagphot.color;em.opt.V;em.opt.Rfloatnullablee_V-R? rms uncertainty on V-Rmagstat.errorfloatnullableJmag? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.errorfloatnullableJ-H? J-H colour indexmagphot.color;em.IR.J;em.IR.Hfloatnullablee_J-H? rms uncertainty on J-Hmagstat.errorfloatnullableH-K? H-K colour indexmagphot.color;em.IR.H;em.IR.Kfloatnullablee_H-K? rms uncertainty on H-Kmagstat.errorfloatnullableJ/AJ/126/1362/table7PhotometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCHSSCHSS number (G2)meta.id;meta.mainintprimaryRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVmag? The V band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? The error in Vmagmagstat.errorfloatnullableV-R? The (V-R) colormagphot.color;em.opt.V;em.opt.Rfloatnullablee_V-R? The error in V-Rmagstat.errorfloatnullableB-VThe (B-V)_0_ color (2)magphot.color;em.opt.B;em.opt.VfloatE(B-V)The E(B-V) reddening value (3)magphot.color.excessfloatJmag? The J band magnitude (4)magphot.mag;em.IR.Jfloatnullablee_Jmag? The error in Jmag (4)magstat.errorfloatnullableJ-H? The (J-H) band color (4)magphot.color;em.IR.J;em.IR.Hfloatnullablee_J-H? The error in J-H (4)magstat.errorfloatnullableH-K? The (H-K) band color (4)magphot.color;em.IR.H;em.IR.Kfloatnullablee_H-K? The error in H-K (4)magstat.errorfloatnullableJ/AJ/126/1362/table8Spectroscopic MeasurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCHSSCHSS number (G2)meta.id;meta.mainintprimaryKPKP (Ca II) index (pseudo-equivalent width)spect.line.eqWidthfloatHP2HP2 (H{delta}) index (pseudo-equivalent width)spect.line.eqWidthfloatHG2? HG2 (H{gamma}) index (pseudo-equivalent width)spect.line.eqWidthfloatnullableGP? The GP (G-band) index (pseudo-equivalent width)spect.line.eqWidthfloatnullableSpTypeEstimated spectral Type (coded B0=10, A0=20, ...)src.spTypefloate_SpTypeError in SpTypestat.errorfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricfloate_RVThe error in RVkm/sstat.errorfloatJ/AJ/126/1362/table9Stellar ParametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCHSSCHSS number (G2)meta.id;meta.mainintprimaryf_CHSS[b] Flag on CHSS (2)meta.code.errorcharTeffEffective temperatureKphys.temperature.effectiveintlog(g)Log of the surface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]GA? [Fe/H] metallicity from the genetic algorithm (3)log(Sun)phys.abund.Fefloatnullable[Fe/H]KP? [Fe/H] metallicity from the KP index (3)log(Sun)phys.abund.Fefloatnullable[Fe/H]EC? [Fe/H] metallicity from the equivalent widths/chi-square spectral match procedure (3)log(Sun)phys.abund.Fefloatnullable[Fe/H]? Final average log [Fe/H] metallicity (3)log(Sun)phys.abund.Fefloatnullableu_[Fe/H]Uncertainty flag on [Fe/H]meta.code.errorcharDist? Estimated distancekpcpos.distancefloatnullableVMAA? Absolute V band magnitude (4)magphys.magAbs;em.optfloatnullable