J/A+A/683/A74ivo://CDS.VizieR/J/A+A/683/A74doi:10.26093/cds/vizier.36830074CDSGent M.R.Eitner P.Serenelli A.Friske J.K.S.Koposov S.E.,Laporte C.F.P.Buck T.Bergemann M.2024-11-29T20:01:23Z2024-03-08T12:26:58ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyf-starschemical-abundanceseffective-temperaturestellar-agesThe presence of [alpha/Fe]-[Fe/H] bi-modality in the Milky Way disc has animated the Galactic archaeology community since more than two decades. Our goal is to investigate the chemical, temporal, and kinematical structure of the Galactic discs using abundances, kinematics, and ages derived self-consistently with the new Bayesian framework SAPP. We employ the public Gaia-ESO spectra, as well as Gaia EDR3 astrometry and photometry. Stellar parameters and chemical abundances are determined for 13426 stars using NLTE models of synthetic spectra. Ages are derived for a sub-sample of 2898 stars, including subgiants and main-sequence stars. The sample probes a large range of Galactocentric radii, ~3 to 12kpc, and extends out of the disc plane to +/-2kpc. Our new data confirm the known bi-modality in the [Fe/H] - [alpha/Fe] space, which is often viewed as the manifestation of the chemical thin and thick discs. The over-densities significantly overlap in metallicity, age, and kinematics, and none of these is a sufficient criterion for distinguishing between the two disc populations. Different from previous studies, we find that the alpha-poor disc population has a very extended [Fe/H] distribution and contains ~ 20% old stars with ages of up to ~11Gyr. Our results suggest that the Galactic thin disc was in place early, at look-back times corresponding to redshifts z~2 or more. At ages ~9 to 11Gyr, the two disc structures shared a period of co-evolution. Our data can be understood within the clumpy disc formation scenario that does not require a pre-existing thick disc to initiate a formation of the thin disc. We anticipate that a similar evolution can be realised in cosmological simulations of galaxy formation.2024A&A...683A..74Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/683/A74CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/683/A74https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/683/A74http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/683/A74https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/683/A74https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/683/A74http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/683/A74GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/683/A74/catalog (Catalogue of parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/683/A74/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/683/A74/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/683/A74/catalog?GETtext/xml+votable180.050000true0.0222431-54.99736250.0055555555555555565/6147 9673 10342 11008 11011 11556 11918 11937 6/16397 16417 17021 17023 17112 17128-17129 17188 17192 17295 17300 17302 17317 17320 17322 17374-17375 17379 17382 17401 17403 17405 17649-17651 17688 17690 17693 17703 17714 17720 17725 17741 17748-17749 17768 17794 17810 17816 17826-17827 17966 17969 17972 17982 17985 18001 18017 18062 18068 18088 18451 18457 18467 18470 18579 18621 18639 18645 18677 18710 18724-18725 18743 18765 18834 18840 18848 18974 18996 19006 19025 19079 19092 19104 19109 21594-21595 21617 21746-21747 21778-21779 21784-21785 21800-21801 21816-21817 21819 21837 21839 21850 21864 21866 21912-21913 21923 21929 22097 22099-22100 22102 22824-22825 22945 22947 23123 23126 23188-23189 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38363-38364 38366 38379 38391 38396-38397 38490-38491 38494 38502-38503 38508-38509 38512 38656 38658 38678 38684 38709 38711 38721 38750 38752 38754 38767 38772 38795 38813 38815 38829 38840 38842 38867 38873 38946 38952 39074 39080 39091 39099 39102 39163 39332 39500-39501 39503 39525 39584 39592 39594 40212 40214 40234 40285 40287 40292 40294 40301 40312 40320 40349 40370 40392 40404 40406 40445 40497 40500 40561 40641 40644 40666-40667 40681 40683 40686 40741 40746-40747 40752 40818-40819 40832-40833 40872 40881 40883 40911 41287 41303 41307 41309-41310 41326 41330 41355 41358 41410 41983 41985-41986 42012 42021 42032 42048 42069 42072 42309 42320 42324-42325 42337 42340 42555 42601 42603-42604 42606 42638-42639 42642 42648-42649 42651 42654 42658-42659 42661 42663 42668 42670-42671 42674 42679 42686-42687 43245 43255-43256 43261 43311 43317 43319 43322 43354-43355 43360 43362 43371 43376-43377 43389 43397 43408 43411 43416-43417 43419 43422 43430-43431 43436-43437 43469 43474 43480 43485 43490 43502 43505-43506 43508 43512 43593 43611 43623 43675 43692 43710 43712 43726 43729-43731 43734-43735 43740-43741 43745 43748 43776 43778 43794-43795 43806-43807 43809 43811 43821 43823 43842 43870 43892-43893 43921 43923 43960 44003 44006 44036-44037 44048 44051 44057 44077 44079 44081-44083 44161 44287 44392 44394 44430-44431 44436 44440-44441 44451-44453 44457 44478 44494 44507 44514 44516 44520 44548 44621 44627 44630 44634 44644 44646 44648 44669 44671 44686 44692 44696-44697 44708 44734-44735 44756 44758 44760 44772 44776-44777 44815 44819 44835 44840 44842 44863 44888-44889 44906 44911 44966 44968 44970 44972 44997 45007 45011 45013 45017-45018 45034 45379 45384 45399 45403 45405-45407 45525 45527 45531 45534 45542-45543 45546 45556 45567 45739 45742 45745 45781 45785 45788 45846 45852 45865 45868 45872 45887 45897 45899 45912 45924-45926 45970-45971 45976-45977 45990 46037-46039 46059 46064-46065 46082 46088 46090 46101 46105 46108 46117 46121 46128 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Should Not be used for identification.meta.recordintCNameTarget ID [Gaia-ESO cname]meta.id;meta.mainchare_TeffUncertainty on TeffKstat.error;phys.temperature.effectivefloatloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggUncertainty on logglog(cm.s**-2)stat.errorfloat[Fe/H]Ratio [Fe/H] in NLTEphys.abund.Fe;arith.ratiofloate_[Fe/H]Uncertainty on NLTE [Fe/H] ratiostat.error;phys.abund.Fefloat[Mg/Fe]Ratio [Mg/Fe] in NLTEphys.abundfloate_[Mg/Fe]Uncertainty on NLTE [Mg/Fe]stat.error;phys.abundfloatVmicMicroturbulence in NLTEkm/sphys.veloc.microTurbfloate_VmicUncertainty on NLTE Vmickm/sstat.errorfloate_AgeUncertainty on AgeGyrstat.error;time.agefloat_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainindexed_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainindexed