J/ApJ/719/996ivo://CDS.VizieR/J/ApJ/719/996doi:10.26093/cds/vizier.17190996CDSSchlesinger K.J.Johnson J.A.Lee Y.S.Masseron T.Yanny B.,Rockosi C.M.Gaudi B.S.Beers T.C.2017-06-22T14:28:24Z2012-07-09T08:08:46ZCDS support team

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

cds-question@unistra.frmultiple-starschemical-abundancesvisible-astronomysloan-photometrystellar-massessurveysastronomical-modelsWe examine the effects that unresolved binaries have on the determination of various stellar atmospheric parameters for targets from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) using numerical modeling, a grid of synthetic spectra, and the SEGUE Stellar Parameter Pipeline (SSPP). The SEGUE survey, a component of the Sloan Digital Sky Survey-II (SDSS-II) project focusing on Galactic structure, provides medium resolution spectroscopy for over 200000 stars of various spectral types over a large area on the sky. To model undetected binaries that may be in this sample, we use a variety of mass distributions for the primary and secondary stars in conjunction with empirically determined relationships for orbital parameters to determine the fraction of G-K dwarf stars, defined by SDSS color cuts as having 0.48<=(g-r)_0_<=0.75, that will be blended with a secondary companion. We focus on the G-K dwarf sample in SEGUE as it records the history of chemical enrichment in our galaxy. To determine the effect of the secondary on the spectroscopic parameters, specifically effective temperature, surface gravity, metallicity, and [{alpha}/Fe], we synthesize a grid of model spectra from 3275 to 7850K and [Fe/H]=-0.5 to -2.5 from MARCS model atmospheres using TurboSpectrum. These temperature and metallicity ranges roughly correspond to a stellar mass range of 0.1-1.0M_{sun}_. We assume that both stars in the pair have the same metallicity. We analyze both "infinite" signal-to-noise ratio (S/N) models and degraded versions of the spectra, at median S/N of 50, 25, and 10.2010ApJ...719..996Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/719/996CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/AJ/136/2070 : SEGUE stellar parameter pipeline. III. (Allende Prieto+, 2008)J/AJ/136/2050 : SEGUE stellar parameter pipeline. II. (Lee+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/719/996https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/719/996http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/719/996https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/719/996https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/719/996http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/719/996GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/719/996/blendProperties of the blended binaries analyzed by the SEGUE Stellar Parameter Pipeline (SSPP), and differences between the blended binaries and control group primariesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintM1[0.5/1.0] Model primary masssolMassphys.massfloatM2[0.1/1.0] Model secondary masssolMassphys.massfloat[Fe/H]m[-2.5/-0.5] Model [Fe/H] metallicityphys.abund.Z;meta.modelledfloatTeff[4166/8176]? SSPP effective temperature (1)Kphys.temperature.effectiveintnullablee_Teff? Uncertainty in Teff (1)Kstat.error;phys.temperature.effectiveintnullable[Fe/H]? SSPP [Fe/H] metallicity (1)phys.abund.Zfloatnullablee_[Fe/H]? Uncertainty in [Fe/H] (1)stat.error;phys.abund.Fefloatnullablelog(g)? SSPP log surface gravity (1)log(cm.s**-2)phys.gravityfloatnullablee_log(g)? Uncertainty in log(g) (1)log(cm.s**-2)stat.errorfloatnullable[a/Fe]? SSPP [{alpha}/Fe] metallicity (1)phys.abund.Zfloatnullablee_[a/Fe]? Uncertainty in [a/Fe] (1)stat.error;phys.abundfloatnullableumagThe u band magnitudemagphot.mag;em.opt.UfloatgmagThe g band magnitudemagphot.mag;em.opt.BfloatrmagThe r band magnitudemagphot.mag;em.opt.RfloatimagThe i band magnitudemagphot.mag;em.opt.IfloatzmagThe z band magnitudemagphot.mag;em.opt.Ifloatg-rThe (g-r) color indexmagphot.color;em.opt.B;em.opt.RfloatDTeff? Differential effective temperature (1)Kphys.temperature.effective;arith.diffintnullablee_DTeff? Uncertainty in DTeffKstat.errorintnullableD[Fe/H]? Differential [Fe/H] metallicity (1)phys.abund.Z;arith.difffloatnullablee_D[Fe/H]? Uncertainty in D[Fe/H]stat.error;phys.abund.FefloatnullableDlog(g)? Differential log surface gravity (1)log(cm.s**-2)phys.gravity;arith.difffloatnullablee_Dlog(g)? Uncertainty in Dlog(g)log(cm.s**-2)stat.errorfloatnullableD[a/Fe]? Differential [{alpha}/Fe] metallicity (1)phys.abund.Z;arith.difffloatnullablee_D[a/Fe]? Uncertainty in D[a/Fe]stat.error;phys.abundfloatnullableDumagDifferential u band magnitude (1)magphot.mag;em.opt.U;arith.difffloatDgmagDifferential g band magnitude (1)magphot.mag;arith.difffloatDrmagDifferential r band magnitude (1)magphot.mag;arith.difffloatDimagDifferential i band magnitude (1)magphot.mag;arith.difffloatDzmagDifferential z band magnitude (1)magphot.mag;arith.difffloatDg-rDifferential (g-r) color index (1)magphot.color;arith.difffloat