J/ApJ/889/63ivo://CDS.VizieR/J/ApJ/889/63doi:10.26093/cds/vizier.18890063CDSHayes C.R.Majewski S.R.Hasselquist S.Anguiano B.Shetrone M.,Law D.R.Schiavon R.P.Cunha K.Smith V.V.Beaton R.L.,Price-whelan A.M.Allende Prieto C.Battaglia G.Bizyaev D.,Brownstein J.R.Cohen R.E.Frinchaboy P.M.Garcia-hernandez D.A.,Lacerna I.Lane R.R.Meszaros S.Moni Bidin C.Munoz R.R.,Nidever D.L.Oravetz A.Oravetz D.Pan K.Roman-lopes A.Sobeck J.,Stringfellow G.2023-06-14T14:22:25Z2020-07-03T07:52:51ZCDS support team

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

cds-question@unistra.frgiant-starspopulation-ii-starschemical-abundancesphotometryradial-velocityUsing 3D positions and kinematics of stars relative to the Sagittarius (Sgr) orbital plane and angular momentum, we identify 166 Sgr stream members observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) that also have Gaia DR2 astrometry. This sample of 63/103 stars in the Sgr trailing/leading arm is combined with an APOGEE sample of 710 members of the Sgr dwarf spheroidal core (385 of them newly presented here) to establish differences of 0.6dex in median metallicity and 0.1dex in [{alpha}/Fe] between our Sgr core and dynamically older stream samples. Mild chemical gradients are found internally along each arm, but these steepen when anchored by core stars. With a model of Sgr tidal disruption providing estimated dynamical ages (i.e., stripping times) for each stream star, we find a mean metallicity gradient of 0.12+/-0.03dex/Gyr for stars stripped from Sgr over time. For the first time, an [{alpha}/Fe] gradient is also measured within the stream, at 0.02_/-0.01dex/Gyr using magnesium abundances and at 0.04+/-0.01dex/Gyr^ using silicon, which imply that the Sgr progenitor had significant radial abundance gradients. We discuss the magnitude of those inferred gradients and their implication for the nature of the Sgr progenitor within the context of the current family of Milky Way satellite galaxies, and we suggest that more sophisticated Sgr models are needed to properly interpret the growing chemodynamical detail we have on the Sgr system.2020ApJ...889...63Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/889/63CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/889/63https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/889/63http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/889/63https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/889/63https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/889/63http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/889/63GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/889/63/table (Properties of Sgr Stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/63/table?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/63/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/63/table?GETtext/xml+votable180.050000true3.80518306-14.507826110.0055555555555555565/4448 12008 12010-12011 6/77 79 88 90 101 133 145-146 176 178 455 845 4435 4440 4442 4446 4468 4536-4537 4567 4663 4719 4731 4734 4769 4789 4820 4852 4859 4865 4869 4881 4900 4940 5024 5139 5145 5226 5249 5894 6145 6225 6402-6403 7033 8358 8870 16883 16886 16889 16981 17173-17174 17218 17711 17757 17798-17799 17809 18068 18176 18179 18435 18448 23192 23207 23226 23325 23371 23383 23483 23912 24269 24271 24274 24282-24283 24305 25848 25850 25875 25880-25881 26015 26023 26078 26169 26178 26196 26253 26596 27486-27487 27508 27632 27634 27640-27641 27667 27861 27888 27891 27901 27903 27905 27908 27910-27911 27913 27917 27947 27975 28033 28066-28067 28072 28075 28289 28297 28299 28333 28417 28735 28758-28759 28928-28929 28932 28944 29348 30757 30780 31411 31416-31417 36860 44377 44389 44981 45024 47852 47868-47869 47871 47970-47971 47976-47977 48010-48011 48014 48036 48038 485038.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/889/63?format=asciidefaultJ/ApJ/889/63/tableProperties of Sgr StarsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latdoublelambdaSunHeliocentric Sagitarius longitudedegpos.framedoublebetaSunHeliocentric Sagitarius latitudedegpos.framedoublelambdaGCGalactocentric Sagitarius longitudedegpos.framedoublebetaGCGalactocentric Sagitarius latitudedegpos.framedoubleJmag2MASS J band magnitudemagphot.mag;em.IR.JfloatHmag2MASS H band magnitudemagphot.mag;em.IR.HfloatKsmag2MASS Ks band magnitudemagphot.mag;em.IR.KfloatDistHeliocentric distancekpcpos.distancefloate_DistUncertainty in Distkpcstat.errorfloatHRVDR16 Heliocentric radial velocity (1)km/sspect.dopplerVeloc;pos.heliocentricdoublee_HRVUncertainty in HRV (1)km/sstat.errordoublepmRAProper motion in RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRAUncertainty in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in DEmas/yrpos.pm;pos.eq.decfloate_pmDEUncertainty in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatXsSgr galactocentric cartesian X_s_ positionkpcphys.veloc;pos.cartesian.x;pos.galactocentricfloatYsSgr galactocentric cartesian Y_s_ positionkpcphys.veloc;pos.cartesian.y;pos.galactocentricfloatZsSgr galactocentric cartesian Z_s_ positionkpcphys.veloc;pos.cartesian.z;pos.galactocentricfloatRcysGsr galactocentric cylindrical radiuskpcphys.size.radius;pos.galactocentricfloatVxsSgr galactocentric cartesian X_s_ velocitykm/sphys.veloc;pos.galactocentric;pos.cartesianfloatVysSgr galactocentric cartesian Y_s_ velocitykm/sphys.veloc;pos.cartesian;pos.galactocentricdoubleVzsSgr galactocentric cartesian Z_s_ velocitykm/sphys.veloc;pos.cartesian;pos.galactocentricfloatVrsSgr galactocentric cylindrical radial velocitykm/sspect.dopplerVeloc;pos.galactocentricfloatVphisSgr galactocentric cylindrical rotational velocitykm/sphys.velocfloatSNRSignal-to-Noise Ratio (2)stat.snrdoubleTeffDR16 effective surface temperature (1)Kphys.temperature.effectivedoublee_TeffUncertainty in Teff (1)Kstat.error;phys.temperature.effectivedoublelog(g)DR16 surface gravity (1)log(cm.s**-2)phys.gravitydoublee_log(g)Uncertainty in log(g) (1)log(cm.s**-2)stat.errordoubleVturbDR16 microturbulent velocity (1)km/sphys.velocdoubleVmacroDR16 macroturbulent velocity (1)km/sphys.veloc.microTurbdouble[Fe/H]DR16 Metallicity (1)log(Sun)phys.abund.Zdoublee_[Fe/H]Uncertainty in [Fe/H] (1)log(Sun)stat.error;phys.abund.Fedouble[Mg/Fe]log Mg/Fe abundance (1)log(Sun)phys.abunddoublee_[Mg/Fe]Uncertainty in [Mg/Fe] (1)log(Sun)stat.error;phys.abunddouble[Si/Fe]log Si/Fe abundance (1)log(Sun)phys.abunddoublee_[Si/Fe]Uncertainty in [Si/Fe] (1)log(Sun)stat.error;phys.abunddoubleAgeDynamical age; -9999 = Null (3)Gyrpos.parallax.dyndoubleMemStream or core membership identifier (4)meta.notecharStudySource of membership with Sgr system (5)meta.bibcharAPOGEEAPOGEE identifiermeta.id;meta.mainchar