J/ApJ/908/79ivo://CDS.VizieR/J/ApJ/908/79doi:10.26093/cds/vizier.19080079CDSGudin D.Shank D.Beers T.C.Yuan Z.Limberg G.Roederer I.U.,Placco V.Holmbeck E.M.Dietz S.Rasmussen K.C.Hansen T.T.,Sakari C.M.Ezzeddine R.Frebel A.2022-10-27T11:37:52Z2022-07-28T12:20:49ZCDS support team

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

cds-question@unistra.frmilky-way-galaxychemically-peculiar-starsvisible-astronomymetallicityproper-motionsradial-velocityWe derive dynamical parameters for a large sample of 446 r-process-enhanced (RPE) metal-poor stars in the halo and disk systems of the Milky Way, based on data releases from the R-Process Alliance, supplemented by additional literature samples. This sample represents more than a 10-fold increase in size relative to that previously considered by Roederer et al. and, by design, covers a larger range of r-process-element enrichment levels. We test a number of clustering analysis methods on the derived orbital energies and other dynamical parameters for this sample, ultimately deciding on application of the HDBSCAN algorithm, which obtains 30 individual chemodynamically tagged groups (CDTGs); 21 contain between 3 and 5 stars, and 9 contain between 6 and 12 stars. Even though the clustering was performed solely on the basis of their dynamical properties, the stars in these CDTGs exhibit statistically significant similarities in their metallicity ([Fe/H]), carbonicity ([C/Fe]), and neutron-capture element ratios ([Sr/Fe], [Ba/Fe], and [Eu/Fe]). These results demonstrate that the RPE stars in these CDTGs have likely experienced common chemical-evolution histories, presumably in their parent satellite galaxies or globular clusters, prior to being disrupted into the Milky Way's halo. We also confirm the previous claim that the orbits of the RPE stars preferentially exhibit pericentric distances that are substantially lower than the present distances of surviving ultrafaint dwarf and canonical dwarf spheroidal galaxies, consistent with the disruption hypothesis. The derived dynamical parameters for several of our CDTGs indicate their association with previously known substructures, dynamically tagged groups, and RPE groups.2021ApJ...908...79Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/908/79CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)III/279 : RAVE 5th data release (Kunder+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)I/349 : StarHorse, Gaia DR2 photo-astrometric distances (Anders+, 2019)J/AJ/90/2089 : Stars of very low metal abundance. I (Beers+, 1985)J/AJ/100/1191 : Giants DDO photometry (Morrison+, 1990)J/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992)J/ApJS/96/175 : Kinematics of Metal-Poor Stars. I. (Beers+ 1995)J/AJ/120/1841 : Abundances & Kinematics of Halo & Disk Stars (Fulbright 2000)J/ApJ/530/783 : The r-process enriched giant HD 115444 (Westin+, 2000)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/ApJ/652/1585 : Bright metal-poor stars from HES survey (Frebel+, 2006)J/ApJ/645/613 : Abundances of HD 221170 (Ivans+, 2006)J/AJ/132/1714 : Photometric and Spectroscopic study of TY Gru (Preston+, 2006)J/A+A/484/721 : HES survey. IV. Candidate metal-poor stars (Christlieb+, 2008)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/A+A/501/519 : Extremely metal-poor turnoff stars abund. (Bonifacio+, 2009)J/MNRAS/404/1529 : s-process in low-metallicity stars (Bisterzo+, 2010)J/ApJ/724/975 : Heavy elements abundances metal-poor stars (Roederer+, 2010)J/ApJ/742/54 : CASH project II. 14 extremely metal-poor stars (Hollek+, 2011)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/A+A/548/A34 : Abundances of carbon-enhanced metal-poor stars (Allen+, 2012)J/MNRAS/434/1681 : Extremely metal-poor stars CaII triplet (Carrera+, 2013)J/ApJ/778/56 : Hamburg/ESO Survey extremely metal-poor stars (Cohen+, 2013)J/ApJ/771/67 : Detailed abundances 97 metal-poor stars. II. (Ishigaki+, 2013)J/ApJ/775/L27 : Chemical abundances in a metal-poor RGB star (Johnson+, 2013)J/ApJ/779/102 : Metallicities of RGB stars in dwarf galaxies (Kirby+, 2013)J/A+A/569/A43 : HE 2252-4225 abundance analysis (Mashonkina+, 2014)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014)J/AJ/147/136 : Stars very low metal abundance VI Abundances (Roederer+, 2014)J/ApJ/807/171 : SkyMapper Survey metalpoor star spectroscopy (Jacobson+, 2015)J/MNRAS/460/884 : EMBLA survey. Galactic bulge metal-poor stars (Howes+, 2016)J/AJ/151/82 : 4 brightest red giants in UFD galaxy Ret 2 (Roederer+, 2016)J/ApJ/844/18 : RAVEJ203843.2-002333 high-resolution spectro. (Placco+, 2017)J/ApJ/864/43 : Abundances 3 bright extremely metal-poor giants (Cain+, 2018)J/A+A/618/A133 : Non standard s-process massive rotating stars (Choplin+, 2018)J/ApJ/858/92 : RPA Southern Pilot Search of 107 Stars (Hansen+, 2018)J/AJ/156/179 : Highly r-process-enhanced field stars kinema. (Roederer+,2018)J/ApJ/865/129 : Abundance analysis of HD 222925 (Roederer+, 2018)J/ApJ/868/110 : R-Process Alliance 1st release Galactic halo (Sakari+, 2018)J/ApJ/863/89 : Gaia DR2 PMs stars in ultra-faint MW satellites (Simon, 2018)J/ApJ/870/83 : Abundances in ultra-faint dwarf gal. GruI & TriII (Ji+, 2019)J/ApJ/875/89 : Metal-poor stars with APF I LAMOST CEMP stars (Mardini+, 2019)J/A+A/627/A173 : Abundances for 4 metal-poor stars (Valentini+, 2019)J/ApJ/898/40 : 2MASSJ15213995-3538094 abund. from high-res. sp. (Cain+, 2020)J/ApJ/898/150 : High-res. MIKE obs. of metal-poor stars (Ezzeddine+, 2020)J/ApJS/249/30 : R-Process Alliance metal-poor star spectro. (Holmbeck+, 2020)J/ApJ/897/78 : RAVEJ183013.5-455510 equivalent-width measure. (Placco+, 2020)J/A+A/638/A76 : StarHorse data for 5 surveys (Queiroz+, 2020)J/ApJ/905/20 : Metal-poor stars observed with SALT/HRS (Rasmussen+, 2020)J/ApJ/891/39 : LAMOSTDR3 very metal-poor stars of Galactic halo (Yuan+, 2020)J/ApJ/907/10 : Initial vs final sample of VMP HK/HES stars (Limberg+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/908/79https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/908/79http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/908/79https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/908/79https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/908/79http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/908/79GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/908/79/table2 (Positions, magnitudes, distances, radial velocities, proper motions for the initial sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/908/79/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/908/79/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/908/79/table2?GETtext/xml+votable180.050000true0.0941667-13.04097220.0055555555555555566/51 2398 5249 5580 5886 8266 8314 8340 8354 8367 8779 9065 9831 10272 10430 10453 10476 10720 11302 11543 13830 15872 16115 16399 16413 16451 16456 16462 16503 16514 16540 16566 16569 16582 16602 16609 16611 16666 16700 16812 16815 16893 16895 16901 17032 17062 17191 17197 17203 17212 17241 17326 17343 17370 17374 17406 17412 17420 17516 17570 17579 17642 17683 17938 17973 18452 18465 18543 18550 18580 18587 18710 18784 18959 18964 18972 19055 19061 19070 19076 19083 19094 19209 19484 20278 20390 20882 21034 21089 21920 22087 22600 22635 22662 22732 22755 22814 23056 23107 23207 23220 23304 24588 24594 24656-24657 24683 24685 24875 24887 24999 25207 25228 25234 25302 25369 25413 25479 25482 25521 25540 25571 25577 25579 25595 25607-25608 25614 25639 25641 25710 25722 25737 25749 25755 25772 25853 25865 25879 25906 25943 25959 25963 26012 26153 26164 26186 26242 26251 26300 26347 26457 26492 26589 26679 26697 26994 27002 27131 27148 27383 27456 27668 27682 27734 27763 27767 28314 28459 28664 28744 28938 28998 29004 29029 29451 29954 30019 30031 30184 30296 30783 30858 30874-30875 30931 30935 30939 30958 31119 31203 31233 31404 31592 31608 32352 32914 32949 32964 33019 33030 33034 33109 33150 33200 33216 33249 33261 33286 33363 33391 33461 33470 33526 33633 33653 33696 33738 33753 33821 33823 34019 34058 34078 34122 34141 34232 34246 34249 34254 34391 34483 34498 34574 34595 34600 34637 34708 34747 34798 34827 34865 34882 34918 34935 34995 35084 35105 35201 35343 35390 35395 35479 35513 35585 35647 35649 35794 35809 35873 35989 36002 36098 36135 36193 36228 36365 36587 36642 36690 36693 36705 36783 36788 36806 36824-36825 36843 36980 37144 37188 37252 37390 37428 37504 37540 37598 37620 37979 38079 38118 38286 38316 38368 38497 38511 38635 38663 38701 38791 38841 38868 38919 38957 38994 39084 39108 39171 39208 39328-39329 39333 39653 39660 39725 39810 40257 40278 40322 40337 40381 40406 40498 40502 40524 40752 40820 40898 41148 41150 41223 41244 41246-41247 41312 41335 41522 41979 42009 42022 42073 42076 42079 42104 42244 42263 42308 42323 42676 42878 42917 43228 43265 43367 43374 43516 43555 43595 43604 43635 43671 43674 43728 43905 43957-43958 44023 44035 44053 44206 44276 44304 44331 44412 44445 44449 44467 44500 44545 44570 44573 44615 44714 44771 44816 44825 44829 44890 44897 44926 44940 44971 44992 44997 45004 45131 45149 45208 45309 45397 45408 45418 45504 45583 45612 45679 45717 45743 45768 45797 45802 45804 45807-45808 45818 45825 45838 45881 45976 46023 46026 46040 46059 46080 46083 46090 46098 46115 46151 46155-46156 46253 46333 46399 46413 46490 46493 46506 46580 46646 46659 46676 46722 46851 46880 46902 46958 47021 47084 47103 47169 47172 47181 47190 47201 47216 47279 47299 47306 47331 47353 47356 47406 47431 47458 47515 47533 47544 47589 47607-47608 47634 47649-47650 47666 47672 47698 47776 47802 47840 47851 47854-47855 47885 47926 47941 47955 48145 48160 48162 48173 48187 48363 48388 48451 48501 48518 48591 48603 48648 48660 48674 48824 48837 48926 48937 48946 48982 49001 49010 49081 49103 49136https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/908/79?format=asciiOpticaldefaultJ/ApJ/908/79/table2Positions, magnitudes, distances, radial velocities, proper motions for the initial sampleSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharprimaryRAJ2000[0/23] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainVmag[5.67/16.5]? V band magnitude (1)magphot.mag;em.opt.VfloatnullableDist-g[0.01/18.5]? Distance based on Gaia DR2 parallax (2)kpcpos.distancefloatnullablee_Dist-g[0/20]? Uncertainty in Dist-gkpcstat.errorfloatnullablef_Dist-gFlag on Dist-g (3)meta.codecharDist-sh[0.01/15.9]? Distance derived StarHorse (4)kpcpos.distancefloatnullablee_Dist-sh[0/7]? Uncertainty on Dist-shkpcstat.errorfloatnullablef_Dist-shFlag on Dist-sh (3)meta.codecharRVel[-380/476]? Radial Velocity (5)km/sphys.veloc;pos.heliocentricfloatnullabler_RVelSource for RVel (5)meta.ref;pos.framecharpmRA[-1001/4003] proper motion, Right Ascension (6)mas/yrpos.pm;pos.eq.radoublepmDE[-5817.86/79.78] proper motion, Declination (6)mas/yrpos.pm;pos.eq.decdoubleJ/ApJ/908/79/table3RPA classes, temperatures, and elemental abundances for the initial sampleNameObject namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClassDominant neutron capture class (1)src.classcharTeff[4150/6650] Stellar effective temperatureKphys.temperature.effectiveint[Fe/H][-4.04/-1] Log, Fe/H number abundance ratiophys.abundfloat[C/Fe][-1.75/2.38]? Log, C/Fe number abundance ratiometa.id;phys.abund;arith.ratiofloatnullable[C/Fe]c[-1.75/2.38]? Log, C/Fe number abundance ratio, corrected (2)meta.id;phys.abund;arith.ratiofloatnullablel_[Sr/Fe]Limit flag for [Sr/Fe]meta.id;phys.abund;arith.ratiochar[Sr/Fe][-2.87/1.44]? Log, Sr/Fe number abundance ratiometa.id;phys.abund;arith.ratiofloatnullable[Ba/Fe][-1.99/2.42] Log, Ba/Fe number abundance ratiometa.id;phys.abund;arith.ratiofloat[Eu/Fe][-0.84/2.83] Log, Eu/Fe number abundance ratiometa.id;phys.abund;arith.ratiofloatRefSources for chemical-abundance information (3)meta.ref;pos.framecharr_Class[0/1] Source for Class (4)meta.ref;pos.frameintJ/ApJ/908/79/table4Derived dynamical parameters for the RPE sampleNameObject namemeta.id;meta.maincharJz[0/3.9] Action due to oscillations along the axis perpendicular to the Galactic plane (1)1000kpc.km.s**-1phys.angMomentumfloatrperi[0.08/18.1] pericentric distancekpcpos.distancefloatrapo[1.63/2057] apocentric distancekpcpos.distancefloatZmax[0.17/157] Maximum distance from the Galactic planekpcpos.distancefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFlagrelative distance errors in the range 20%<e<30%meta.code.errorcharEnergy[-2.42/-0.08] Specific orbital energy (1)100000km**2.s**-2phys.energyfloatEcc[0.04/0.99] Orbit eccentricity (1)src.orbital.eccentricityfloatJr[0/84.85] Actions due to oscillations along the orbital radius (1)1000kpc.km.s**-1phys.angMomentumfloatJp[-6.1/3.92] Action due to orbital motions (1)1000kpc.km.s**-1phys.angMomentumfloatJ/ApJ/908/79/table5CDTGs identified from the HDBSCAN algorithmNstar[3/12] Number of stars in CDTG (1)meta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCDTGChemo-Dynamically Tagged Group number (1)meta.idcharCL[12.4/99.8] Confidence level, CDTG (1)stat.fit.paramfloatNameObject Name (1)meta.id;meta.maincharFlagrelative distance errors in the range 20%<e<30%meta.code.errorcharClassDominant neutron capture class (2)src.classchar[Fe/H][-3.2/0.95] Log, Fe/H number abundance ratiophys.abundfloate_[Fe/H][0.08/0.7]? Standard deviation CDTG mean [Fe/H]meta.id;phys.abund;arith.ratiofloatnullablel_[C/Fe]Limit flag for [C/Fe]meta.id;phys.abund;arith.ratiochar[C/Fe][-0.95/1.78]? Log, C/Fe number abundance ratiometa.id;phys.abund;arith.ratiofloatnullablee_[C/Fe][0.05/0.6]? Standard deviation CDTG mean [C/Fe]meta.id;phys.abund;arith.ratiofloatnullablel_[C/Fe]cLimit flag for [C/Fe]cmeta.id;phys.abund;arith.ratiochar[C/Fe]c[-0.57/1.78]? Log, C/Fe (corrected) number abundance ratio (3)meta.id;phys.abund;arith.ratiofloatnullablee_[C/Fe]c[0.02/0.6]? Standard deviation CDTG mean [C/Fe]c (3)meta.id;phys.abund;arith.ratiofloatnullablel_[Sr/Fe]Limit flag for [Sr/Fe]meta.id;phys.abund;arith.ratiochar[Sr/Fe][-2.87/1.11]? Log, Sr/Fe number abundance ratiometa.id;phys.abund;arith.ratiofloatnullablee_[Sr/Fe][0.09/0.6]? Standard deviation CDTG mean [Sr/Fe]meta.id;phys.abund;arith.ratiofloatnullable[Ba/Fe][-0.85/0.98] Log, Ba/Fe number abundance ratiometa.id;phys.abund;arith.ratiofloate_[Ba/Fe][0.01/0.6]? Standard deviation CDTG mean [Ba/Fe]meta.id;phys.abund;arith.ratiofloatnullable[Eu/Fe][0.02/1.7] Log, Eu/Fe number abundance ratiometa.id;phys.abund;arith.ratiofloate_[Eu/Fe][0.02/0.6]? Standard deviation CDTG mean [Eu/Fe]meta.id;phys.abund;arith.ratiofloatnullable[Eu/H][-2.46/-0.29]? Log, Eu/H number abundance ratiometa.id;phys.abund;arith.ratiofloatnullablee_[Eu/H][0.13/0.8]? Standard deviation CDTG mean [Eu/H]stat.error;phys.abundfloatnullable