J/MNRAS/503/2539ivo://CDS.VizieR/J/MNRAS/503/2539doi:10.26093/cds/vizier.75032539CDSCordoni G.Da Costa G.S.Yong D.Mackey A.D.Marino A.F.Monty S.,Nordlander T.Norris J.E.Asplund M.Bessell M.S.Casey A.R.,Frebel A.Lind K.Murphy S.J.Schmidt B.P.Gao X.D.,Xylakis-Dornbusch T.Amarsi A.M.Milone A.P.2024-11-06T20:33:17Z2024-03-04T15:50:00ZCDS support team

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

cds-question@unistra.frmilky-way-galaxychemically-peculiar-starsstellar-distanceIn this work, we combine spectroscopic information from the SkyMapper survey for Extremely Metal-Poor stars and astrometry from Gaia DR2 to investigate the kinematics of a sample of 475 stars with a metallicity range of -6.5<=[Fe/H]<=-2.05dex. Exploiting the action map, we identify 16 and 40 stars dynamically consistent with the Gaia Sausage and Gaia Sequoia accretion events, respectively. The most metal poor of these candidates have metallicities of [Fe/H]=-3.31 and -3.74, respectively, helping to define the low-metallicity tail of the progenitors involved in the accretion events. We also find, consistent with other studies, that ~21 per cent of the sample have orbits that remain confined to within 3kpc of the Galactic plane, that is, |Z_max_|<=3kpc. Of particular interest is a subsample (~11 per cent of the total) of low |Z_max_| stars with low eccentricities and prograde motions. The lowest metallicity of these stars has [Fe/H]=-4.30 and the subsample is best interpreted as the very low-metallicity tail of the metal-weak thick disc population. The low |Z_max_|, low eccentricity stars with retrograde orbits are likely accreted, while the low |Z_max_|, high eccentricity pro- and retrograde stars are plausibly associated with the Gaia Sausage system. We find that a small fraction of our sample (~4 per cent of the total) is likely escaping from the Galaxy, and postulate that these stars have gained energy from gravitational interactions that occur when infalling dwarf galaxies are tidally disrupted.2021MNRAS.503.2539Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/503/2539CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)II/358 : SkyMapper Southern Sky Survey. DR1.1 (Wolf+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/503/2539https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/503/2539http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/503/2539https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/503/2539https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/503/2539http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/503/2539GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/503/2539/table1 (Observed properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/503/2539/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/503/2539/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/503/2539/table1?GETtext/xml+votable180.050000true346.3555462025884-21.63530885245510.0055555555555555566/2426 8345 16399 16646 16700 16784 16819 17033 17040 17095 17203 17325 17353 17364 17432 18000 18027 18056 18439 18447 18491 18503 18545 18604 18612 18640 18719 18732 18741 18945 19022-19023 19083 19087 19109 20523 20576 20671 20674 21018 21105 21434 21773-21774 22625 22632 23202 24577 24682-24683 24696 24703 24780 25012 25019 25021 25056 25103 25145 25222 25530 25719 25761 25832 25887 25973 26200 26530 26651 26673 26720 26775 26795 26860 26879 26888 27001 27131 27146 27150 27169 27235 27237 27281 27283 27846 28737 28993 29004 29010 29311 29760-29761 29776 29778 29979 29983 30031 30051 30858 30933 31140 31233 31316 31361 31377 32797 32809 32890 32892-32893 32904 32914 32921 32923-32924 32966 32980 32995 33012 33014 33019 33139 33150 33185 33192 33351 33391 33401 33415 33417 33473 33556 33560 33641 33662 33670 33673 33703 33715 33750 33771 33803 33811 33815 33841 33861 33889 33983 34023 34069 34077 34111 34115 34225 34254 34278 34491 34495 34690 34799 34826 34844 34990 34995 35001 35008-35009 35022 35079 35109 35117 35122 35197 35234 35313 35329 35338 35343 35347 35352 35367 35471 35487 35508 35532 35607 35665 35733 35760 35794 35881 35889 35974 36033 36098 36409 36430 36837 36905 37055 37058 37078 37086 37089 37159 37390 37504 37537 37554 37581 37583 37641 37645 38137 38152 38337 38485 38497 38593 38721 38744 38766 38794 38805 38807 38919 38924 38929 38935 38953 38957 39002 39064 39464 39629 40027 40029 40119 40144 40167 40235 40299-40300 40333 40348 40416 40445 40693 40723 40747 40752 40758 40761 40912 40980 40987 40990 41021 41038 41073 41172 41244 41249 41253 41260 41268 41281 41315-41316 41324-41326 41330 41340 41396 41410 41416 41964 41979 42005 42011 42021 42034 42037 42054 42062 42084 42097 42243 42248 42308 42641 42669 42671 42741 42876 42920 42924 42943 43224 43228 43261 43328 43357 43365 43391 43398 43407 43419 43447 43479 43619 43625 43649 43674 43699 43717 43742-43743 43757 43764 43830 43905 43941 43980 43996 44009 44016 44039 44079 44082 44090 44117 44143 44238 44272 44277 44281 44350 44419 44421 44460-44461 44501 44543 44562 44627 44727 44735 44776 44846 44934 44992 45028 45091 45148 45365 45418 45425 45470 45474 45502 45591 45608 45655 45679 45741 45747 45779 45796 45826 45843-45844 45894 45913 45935 45973 45980 45997 46010 46083 46102 46104 46216 46227 46230 46283 46312 46339 46444 46483 46544 46552 46659 46759 46845 46880 46886 46893 46901 46940 46966-46967 47102 47125 47135 47159 47166 47202 47209 47252 47285 47298 47314 47360 47460 47469 47544 47556 47610 47627 47636 47640 47670 47684 47715 47729 47745-47746 47773 47849 47852 47861 47892 47896-47897 47943 47963 47988 47993 48024 48066 48098 48121 48147 48194 48209 48240 48286 48293 48335 48481 48488 48559 48747 48816 48862 48885 48887 48942 49051 49070 49121 49136https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/503/2539?format=asciidefaultJ/MNRAS/503/2539/table1Observed propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadNameSimbad column added by the CDSmeta.idcharnullableIndexIndexmeta.idintGaiaDR2GaiaDR2 source_idmeta.id;meta.mainSMSSJSkyMapper SMSS identifier (HHMMSS.ss+DDMMSS.s)meta.idcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainplxParallaxmaspos.parallax.trigdoublee_plxParallax errormasstat.error;pos.parallaxdoubleDistDistancekpcpos.distancedoublee_DistDistance errorkpcstat.errordoubleflag[0/1]meta.code.errorintpmRAProper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublepmDEProper motion along DEmas/yrpos.pm;pos.eq.decdoublee_pmRAProper motion along RA errormas/yrstat.error;pos.pm;pos.eq.radoublee_pmDEProper motion along DE errormas/yrstat.error;pos.pm;pos.eq.decdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorkm/sstat.errordoublelogTeffEffective temperaturelog(K)phys.temperature.effectivedoublee_logTeffEffective temperature errorlog(K)stat.error;phys.temperature.effectivedouble[Fe/H]Metallicityphys.abund.ZfloatE(B-V)B-V colour excessmagphot.color.excessdoubleDatasetIdDatasetmeta.id;meta.datasetcharJ/MNRAS/503/2539/table2Derived orbital propertiesE_JpOrbital action Jp (upper value)kpc.km/sstat.error;stat.maxdoubleJzOrbital action Jzkpc.km/sarith.grad;phys.velocdoubleE_eccEccentricity error (upper value)stat.error;stat.maxdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIndexIndexmeta.idinteccEccentricitysrc.orbital.eccentricitydoublee_eccEccentricity error (lower value)stat.errordoubleapoApo-galacticon distancekpcpos.distance;src.orbitaldoublee_apoApo-galacticon distance (lower value)kpcstat.errordoubleE_apoApo-galacticon distance (upper value)kpcstat.error;stat.maxdoubleperiPeri-galacticon distancekpcpos.distance;src.orbitaldoublee_periPeri-galacticon distance (lower value)kpcstat.errordoubleE_periPeri-galacticon distance (upper value)kpcstat.error;stat.maxdoublezmaxMaximun height above the planekpcpos.cartesian.z;pos.galacticdoublee_zmaxMaximun height above the plane (lower value)kpcstat.errordoubleE_zmaxMaximun height above the plane (upper value)kpcstat.error;stat.maxdoubleJrOrbital action Jrkpc.km/sarith.grad;phys.velocdoublee_JrOrbital action Jr (lower value)kpc.km/sstat.errordoubleE_JrOrbital action Jr (upper value)kpc.km/sstat.error;stat.maxdoubleJpOrbital action Jpkpc.km/sarith.grad;phys.velocdoublee_JpOrbital action Jp (lower value)kpc.km/sstat.errordoublee_JzOrbital action Jz (lower value)kpc.km/sstat.errordoubleE_JzOrbital action Jz (upper value)kpc.km/sstat.error;stat.maxdoubleEnergyOrbital energykpc.km**2.s**-2phys.energydoublee_EnergyOrbital energy (lower value)kpc.km**2.s**-2stat.error;phys.energydoubleE_EnergyOrbital energy (upper value)kpc.km**2.s**-2stat.error;stat.maxdoubleUU velocitykm/sphys.veloc;pos.cartesian.xdoublee_UU velocity (lower value)km/sstat.error;pos.cartesian.xdoubleE_UU velocity (upper value)km/sstat.error;stat.maxdoubleVV velocitykm/sphys.veloc;pos.cartesian.ydoublee_VV velocity (lower value)km/sstat.error;pos.cartesian.ydoubleE_VV velocity (upper value)km/sstat.error;stat.maxdoubleWW velocitykm/sphys.veloc;pos.cartesian.zdoublee_WW velocity (lower value)km/sstat.error;pos.cartesian.zdoubleE_WW velocity (upper value)km/sstat.error;stat.maxdoubleOrbitTypeOrbit typesrc.classchar