247014 subgiant stars data J/other/Nat/603. ivo://CDS.VizieR/J/other/Nat/603.599 CDS Xiang M. Rix H.-W. 2024-05-07T07:17:58Z 2023-07-07T13:47:18Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr milky-way-galaxy giant-stars visible-astronomy stellar-ages The formation of our Milky Way can be split up qualitatively into different phases that resulted in its structurally different stellar populations: the halo and the disk components. Revealing a quantitative overall picture of our Galaxy's assembly requires a large sample of stars with very precise ages. Here we report an analysis of such a sample using subgiant stars. We find that the stellar age-metallicity distribution p({tau}, [Fe/H]) splits into two almost disjoint parts, separated at age {tau}~=8Gyr. The younger part reflects a late phase of dynamically quiescent Galactic disk formation with manifest evidence for stellar radial orbit migration4; the other part reflects the earlier phase, when the stellar halo and the old {alpha}-process-enhanced (thick) disk formed. Our results indicate that the formation of the Galaxy's old (thick) disk started approximately 13Gyr ago, only 0.8Gyr after the Big Bang, and 2Gyr earlier than the final assembly of the inner Galactic halo. Most of these stars formed around 11Gyr ago, when the Gaia-Sausage-Enceladus satellite merged with our Galaxy. Over the next 5-6Gyr, the Galaxy experienced continuous chemical element enrichment, ultimately by a factor of 10, while the star-forming gas managed to stay well mixed. 2022Natur.603..599X https://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/Nat/603.599 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/350 : Gaia EDR3 (Gaia Collaboration, 2020) http://dr7.lamost.org/catalogue : LAMOST DR7 Home Page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/Nat/603.599 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/Nat/603.599 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/Nat/603.599 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/Nat/603.599 https://vizier.iucaa.in/viz-bin/votable?-source=J/other/Nat/603.599 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/Nat/603.599 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/other/Nat/603.599/table1 (Stellar age, abundance, and orbit action for 247014 subgiant stars from LAMOST DR7 and Gaia eDR3) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/Nat/603.599/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/other/Nat/603.599/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/Nat/603.599/table1? GET text/xml+votable 180.0 50000 true 331.58157694 -1.51210611 0.005555555555555556 2/1 3 9-10 18-19 24 26 34-36 85 93 95 3/0 16 18 21 23-24 26-27 29 33 35 48 66-68 71 80-81 83-84 86 88-89 92 94 101-103 108-110 112 129-130 151 153 161-162 164 166 168 171 234-235 286 297 299 317-319 347 350-351 363-364 367 370-371 377-378 406 413 415 422-423 425-426 428 430 435 437-438 445-446 485 496 498 4/4 11 13-15 38 41-42 44-45 47 68-69 71 78-81 83 89-91 100-101 103 112 120-121 124 128-129 131 137-139 176-177 179 182-183 185-186 196 198-202 256-258 260-262 276-277 279-280 282-283 328-330 340 343 348-349 351 361-364 366-367 373-375 400-402 444 452-454 456-458 480 512-513 524 527 529-531 533-535 537-540 542-543 592 594-595 597 599 602-603 610-611 616-618 620-621 623-625 628-630 633-634 640 643 652-653 655 660 662-663 668-669 671 676-677 680-681 689 691 693-696 699-700 705-710 713-714 736 773 786 791-792 798-799 802 821 825 830 833 837-839 841 844-845 848-849 851 853 855-857 859-862 866-867 872-873 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30684-30685 30843 30893 30906-30907 30910-30911 30918-30919 30949 30951 30955 30957-30959 30968-30970 30972 30975 30999 31001-31003 31016-31018 31021-31025 31027 31137-31139 31152 31154 31196-31197 31199 31217-31219 31248-31249 31251 31257 31260 31262-31263 31281 31283 31289 31291 31344 31346 31350 31363 31369-31371 31376 31378-31379 31418-31419 31452-31453 31455 31520-31521 31525-31527 31584 31586-31590 31610-31611 31645 31647 31660-31661 31663 31724-31726 31816 31818-31819 31821-31824 31826 31828 31832 31834 31836 31839 31848-31849 31851 31936 31938-31939 32032 32034-32035 32046 32059 32098 32108 32110-32111 32132 32134-32135 32147 32156 32178 32192-32193 32195-32196 32198 32200-32201 32204-32205 32221-32223 32232 32234-32235 32241 32243 32249-32251 32260 32262-32263 32380-32381 32383 32396 32416 32418 32423-32424 32426-32427 32432-32433 32435 32446-32447 32468 32470-32471 32480 32482-32483 32489 32491 32540-32542 32566-32567 32581 32583-32584 32587 32589-32591 32640-32641 32643 32676-32677 32679 32696-32697 32699 32708-32709 32711 32717-32719 32744-32745 32747 36710-36711 36714-36715 36722-36723 36726 36732 36734-36735 36759 36765 36777 36781 36783 36794 36812-36813 36815 36836-36837 36839 36845-36847 40797 40859 40862 40871 40880-40881 40883 40889-40891 40903 40906-40907 40914-40915 40929-40931 44985 44987 44989-44991 45017 45019 45033-45035 48983 48988-48989 48997-48999 49020 49022-49023 49093 49095 49141 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/Nat/603.599?format=ascii Optical default J/other/Nat/603.599/table1 Stellar age, abundance, and orbit action for 247014 subgiant stars from LAMOST DR7 and Gaia eDR3 Id Sequential number meta.record int recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int RAJ2000 Right ascension (J2000) deg pos.eq.ra;meta.main indexed DEJ2000 Declination (J2000) deg pos.eq.dec;meta.main indexed Age Age estimate Gyr time.age float e_Age Uncertainty in age estimate Gyr stat.error;time.age float [Fe/H] LAMOST metallicity phys.abund.Z float e_[Fe/H] Uncertainty in [Fe/H] stat.error;phys.abund.Fe float JR Orbital radial action kpc.km/s arith.grad;phys.veloc double JPHI Orbital azimuthal action kpc.km/s phys.angMomentum double JZ Orbital vertical action kpc.km/s arith.grad;phys.veloc double X X value in Galactic rectangular coordinate, positive to anti-center kpc pos.cartesian.x;pos.galactic float Y Y value in Galactic rectangular coordinate kpc pos.cartesian.y;pos.galactic float Z Z value in Galactic rectangular coordinate, positive to north pole kpc pos.cartesian.z;pos.galactic float GaiaeDR3 Display the Gaia eDR3 data (Gaia Coll., 2020, Cat. I/350) meta.ref.url char LAMOST LAMOST spectral id, in format of obsdate-planid-spectrograph-fiber meta.id;instr.bandwidth char S/Ng LAMOST spectral S/N in SDSS g band phot.mag;em.opt.B float Teff LAMOST effective temperature K phys.temperature.effective float e_Teff Uncertainty in Teff K stat.error;phys.temperature.effective float logg LAMOST surface gravity derived log(cm.s**-2) phys.gravity float e_logg Uncertainty in logg log(cm.s**-2) stat.error float MKspec Spectroscopic absolute magnitude in 2MASS Ks band mag phys.magAbs float e_MKspec Uncertainty in MKspec mag stat.error float MKcomb Spectroscopic & geometric combined absolute magnitude in 2MASS Ks band mag phys.magAbs float e_MKcomb Uncertainty in MKcomb mag stat.error float [alpha/Fe] ? LAMOST alpha-to-iron abundance ratio phys.abund float nullable e_[alpha/Fe] ? Uncertainty in [alpha/Fe] stat.error;phys.abund float nullable