J/MNRAS/448/2717ivo://CDS.VizieR/J/MNRAS/448/2717doi:10.26093/cds/vizier.74482717CDSWalker M.G.Olszewski E.W.Mateo M.2024-08-14T20:20:19Z2016-03-09T10:54:31ZCDS support team

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

cds-question@unistra.frgalaxiesgiant-starshorizontal-branch-starsspectroscopyvisible-astronomysloan-photometryWe introduce a Bayesian method for fitting faint, resolved stellar spectra in order to obtain simultaneous estimates of redshift and stellar-atmospheric parameters. We apply the method to thousands of spectra - covering 5160-5280{AA} at resolution R~20000 - that we have acquired with the MMT/Hectochelle fibre spectrograph for red giant and horizontal branch candidates along the line of sight to the Milky Way's dwarf spheroidal satellite in Draco. The observed stars subtend an area of ~4deg^2^, extending ~3 times beyond Draco's nominal 'tidal' radius. For each spectrum, we tabulate the first four moments - central value, variance, skewness and kurtosis - of posterior probability distribution functions representing estimates of the following physical parameters: line-of-sight velocity (v_los_), effective temperature (T_eff_), surface gravity (logg) and metallicity ([Fe/H]). After rejecting low-quality measurements, we retain a new sample consisting of 2813 independent observations of 1565 unique stars, including 1879 observations for 631 stars with (as many as 13) repeat observations. Parameter estimates have median random errors of v_los_=0.88km/s, T_eff_=162K, {sigma}logg=0.37dex and {sigma}[Fe/H]=0.20dex. Our estimates of physical parameters distinguish ~470 likely Draco members from interlopers in the Galactic foreground.2015MNRAS.448.2717Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/448/2717CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/145/245 : SDSS stars in Draco dwarf spheroidal galaxy (Rave+, 2003)J/MNRAS/375/831 : Draco MegaCam, INT and HST photometry (Segall+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/448/2717https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/448/2717http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/448/2717https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/448/2717https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/448/2717http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/448/2717GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/448/2717/table4 (Hectochelle data from individual observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2717/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2717/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2717/table4?GETtext/xml+votable180.050000true260.011557.81588890.005555555555555556Cone search capability for table J/MNRAS/448/2717/table5 (Hectochelle data with weighted means for stars with multiple observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/2717/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/2717/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/2717/table5?GETtext/xml+votable180.050000true260.011557.81588890.0055555555555555565/2545 6/10075 10078 10095 10097 10099-10100 10106 10179 10187-10190 10192 10194https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/448/2717?format=asciiOpticaldefaultJ/MNRAS/448/2717/table4Hectochelle data from individual observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay individual observations and weighted meansmeta.ref.urlcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainHJDHeliocentric Julian datedtime.epochdoubleS/Nmedian signal-to-noise ratio per pixelem.wl.central;stat.medianfloatvlosModel line-of-sight velocity in the heliocentric rest frame (1)km/sphys.veloc;pos.heliocentricfloate_vlosrms uncertainty on vlos (2)km/sstat.errorfloatvlosskThird (skewness) moment for vlosstat.fit.paramfloatvloskuFourth (kurtosis) moment for vlosstat.fit.paramfloatTeffModel effective temperature (1)Kphys.temperature.effective;meta.modelledinte_Teffrms uncertainty on Teff (2)Kstat.error;phys.temperature.effectiveintTeffskThird (skewness) moment for Teffstat.fit.paramfloatTeffkuFourth (kurtosis) moment for Teffstat.fit.paramfloatloggModel surface gravity (1)log(cm.s**-2)phys.gravity;meta.modelledfloate_loggrms uncertainty on logg (2)log(cm.s**-2)stat.errorfloatloggskThird (skewness) moment for loggstat.fit.paramfloatloggkuFourth (kurtosis) moment for loggstat.fit.paramfloat[Fe/H]Model metallicity (1)phys.abund.Z;meta.modelledfloate_[Fe/H]rms uncertainty on [Fe/H] (2)stat.error;phys.abund.Fefloat[Fe/H]skThird (skewness) moment for [Fe/H]stat.fit.paramfloat[Fe/H]kuFourth (kurtosis) moment for [Fe/H]stat.fit.paramfloatJ/MNRAS/448/2717/table5Hectochelle data with weighted means for stars with multiple observationsSimbadNameSimbad column added by the CDSmeta.idchar[Fe/H]Estimates metallicityphys.abund.ZfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAllDisplay individual observations and weighted meansmeta.ref.urlcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maingmag? SDSS g magnitude, corrected for extinctionmagphot.mag;em.opt.Bfloatnullableimag? SDSS i magnitude, corrected for extinctionmagphot.mag;em.opt.IfloatnullablevlosEstimates line-of-sight velocity in the heliocentric rest framekm/sphys.veloc;pos.heliocentricfloate_vlosrms uncertainty on vloskm/sstat.errorfloatTeffEstimates effective temperatureKphys.temperature.effectiveinte_Teffrms uncertainty on TeffKstat.error;phys.temperature.effectiveintloggEstimates surface gravitylog(cm.s**-2)phys.gravityfloate_loggrms uncertainty on logglog(cm.s**-2)stat.errorfloate_[Fe/H]rms uncertainty on [Fe/H]stat.error;phys.abund.FefloatNobsNumber of observationsmeta.numberint