J/ApJ/852/49ivo://CDS.VizieR/J/ApJ/852/49doi:10.26093/cds/vizier.18520049CDSHayes C.R.Majewski S.R.Shetrone M.Fernandez-Alvar E.Prieto C.A.,Schuster W.J.Carigi L.Cunha K.Smith V.V.Sobeck J.Almeida A.,Beers T.C.Carrera R.Fernandez-Trincado J.G.Garcia-Hernandez D.A.,Geisler D.Lane R.R.Lucatello S.Matthews A.M.Minniti D.,Nitschelm C.Tang B.Tissera P.B.Zamora O.2019-05-08T14:59:48Z2018-01-25T08:27:32ZCDS support team

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

cds-question@unistra.frchemical-abundancesastrometryphotometryradial-velocitygiant-starspopulation-ii-starsWe find two chemically distinct populations separated relatively cleanly in the [Fe/H]-[Mg/Fe] plane, but also distinguished in other chemical planes, among metal-poor stars (primarily with metallicities [Fe/H]<-0.9) observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE) and analyzed for Data Release 13 (DR13) of the Sloan Digital Sky Survey. These two stellar populations show the most significant differences in their [X/Fe] ratios for the {alpha}-elements, C+N, Al, and Ni. In addition to these populations having differing chemistry, the low metallicity high-Mg population (which we denote "the HMg population") exhibits a significant net Galactic rotation, whereas the low-Mg population (or "the LMg population") has halo-like kinematics with little to no net rotation. Based on its properties, the origin of the LMg population is likely an accreted population of stars. The HMg population shows chemistry (and to an extent kinematics) similar to the thick disk, and is likely associated with in situ formation. The distinction between the LMg and HMg populations mimics the differences between the populations of low- and high-{alpha} halo stars found in previous studies, suggesting that these are samples of the same two populations.2018ApJ...852...49Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/852/49CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttp://www.sdss.org/dr13/irspec/spectro_data : APOGEE Data Access Homne Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/852/49https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/852/49http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/852/49https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/852/49https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/852/49http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/852/49GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/852/49/table1 (Properties, parameters, and population identification of APOGEE DR13 metal-poor stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/852/49/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/852/49/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/852/49/table1?GETtext/xml+votable180.050000true0.540703916.02758810.0055555555555555565/1306 1493 2338 2373 2416 2580 2824 3785 4449 4753 4943 6346 6462 6505 6528 6648 6676 6728 7329 7331 7337 7692 7849 6/76 79 133 144 147 153 382 523 549 550 551 556 1013 1015 1291 1323 1324 1390 1401 1418 1436 1488 1630 1696 1697 1752 1792 1981 2541 2664 2705 2781 2980 3229 3331 3369 3587 3631 3742 3753 3822 3857 4072 4073 4074 4088 4108 4111 4122 4129 4133 4296 4298 4299 4320 4321 4674 4675 4681 4783 4852 4854 4859 4860 4861 4862 4935 4941 5081 5084 5086 5087 5108 5148 5181 5218 5327 5337 5338 5373 5554 5562 5567 5677 5688 5916 5964 5965 5966 5982 6151 6363 6364 6367 6389 6401 6402 6403 6404 6406 6545 6547 6720 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11187 11189 11190 11203 11210 11274 11278 11300 11302 11393 11426 11427 11433 11434 11786 11986 11987 11992 11993 11996 12254 12272 12382 12404 12405 12576 12853 12862 12874 12896 12897 12900 12948 12949 12951 12954 12981 12988 13155 13162 13921 13924 13981 14175 14225 14244 14267 14356 14375 14498 14502 14504 14567 14587 14684 14756 14762 14763 14782 14794 14818 14825 14827 14918 14923 14931 14933 14936 14942 14955 14956 14959 14960 14963 14964 14967 14975 15057 15060 15105 15106 15113 15115 15116 15118 15122 15126 15132 15135 15136 15137 15139 15145 15146 15149 15151 15156 15158 15159 15168 15170 15338 15514 15651 15656 16115 17792 17793 17801 18089 18090 18091 18092 18094 18419 18424 18425 18426 18430 18671 18839 19024 19089 19091 19094 19096 19189 19219 19222 19223 19228 19231 19460 19627 19630 19687 19697 19698 19700 19705 19771 19796 19861 19969 19972 19975 19980 19981 20560 20812 21481 21483 22078 22087 22106 22227 22236 22249 22254 22380 22405 22516 23192 23225 23754 23770 23838 23977 23978 24061 24191 24285 24358 24440 24450 25051 25327 25339 25345 25347 25350 25353 25356 25358 25378 25379 25391 25400 25402 25403 25429 25488 25489 25492 25589 25595 25605 25607 25616 25618 25625 25854 25855 25872 25875 25880 25881 25884 26014 26019 26028 26036 26037 26039 26058 26063 26072 26074 26075 26080 26096 26097 26100 26118 26120 26121 26124 26161 26169 26172 26173 26178 26179 26182 26184 26185 26187 26193 26243 26244 26245 26249 26252 26253 26255 26258 26277 26281 26282 26283 26557 26596 26598 26600 26602 26603 26604 26653 26655 26699 26702 26721 26722 26723 26890 26891 26894 26916 26918 26921 26963 26966 26968 26969 26972 26975 26987 26996 26997 27006 27007 27032 27056 27072 27073 27088 27089 27092 27093 27122 27123 27132 27134 27168 27255 27484 27509 27605 27640 27643 27668 27670 27675 27676 27677 27678 27774 27775 27862 27863 27891 27893 27895 27900 27911 27913 27916 27917 27944 27946 27947 27969 27972 27973 27975 27980 27981 27984 27986 28066 28067 28072 28073 28075 28139 28148 28150 28151 28168 28202 28245 28247 28252 28253 28289 28290 28291 28296 28297 28299 28323 28326 28329 28332 28334 28462 28480 28481 28483 28484 28486 28548 28549 28551 28622 28643 28644 28646 28648 28664 28727 28733 28757 28758 28759 28770 28777 28779 28780 28782 28783 28821 28823 28845 28846 28847 28851 28854 28858 28859 28861 28865 28872 28880 28882 28888 28892 28899 28900 28910 28911 28920 28924 28928 28929 28932 29067 29093 29161 29164 29184 29188 29190 29191 29199 29206 29207 29210 29213 29221 29230 29231 29242 29260 29298 29304 29305 29307 29328 29441 29459 29468 29565 29877 29889 29897 29900 29920 29922 29929 30184 30230 30231 30236 30342 30373 30381 30385 30386 30392 30529 30563 30681 30685 30746 30747 30774 30776 30777 30780 30857 30858 30860 30862 30863 30881 30884 30972 30973 30975 31138 31144 31146 31147 31369 31371 31374 31375 31393 31395 31405 31407 31416 31417 31418 31488 31577 31578 31579 31580 31582 31600 31601 31603 31604 31605 31606 31748 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Uncertainty in [CNO/Fe]stat.error;phys.abunddoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPOGEEAPOGEE Identifier, 2MHHMMSSss+DDMMSSsmeta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latdoubleJmag2MASS J magnitudemagphot.mag;em.IR.JfloatHmag2MASS H magnitudemagphot.mag;em.IR.HfloatKmag2MASS Ks magnitudemagphot.mag;em.IR.KfloatHRVHeliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricdoublee_HRVUncertainty in HRVkm/sstat.errordoubleTeffEffective surface temperature (1)Kphys.temperature.effectivefloatloggSurface gravity (1)log(cm.s**-2)phys.gravitydoubleVturbMicroturbulent velocitykm/sphys.velocdoubleVmacroMacroturbulent velocitykm/sphys.velocdouble[Fe/H]? Log abundance, [Fe/H]phys.abund.Fedoublenullablee_[Fe/H]? Uncertainty in [Fe_H]stat.error;phys.abund.Fedoublenullable[a/Fe]? Log abundance, [a/Fe]phys.abunddoublenullablee_[a/Fe]? Uncertainty in [a/Fe]stat.error;phys.abunddoublenullable[C/Fe]? Log abundance, [C/Fe]phys.abunddoublenullablee_[C/Fe]? Uncertainty in [C/Fe]stat.error;phys.abunddoublenullable[N/Fe]? Log abundance, [N/Fe]phys.abunddoublenullablee_[N/Fe]? Uncertainty in [N/Fe]stat.error;phys.abunddoublenullable[O/Fe]? Log abundance, [O/Fe]phys.abunddoublenullablee_[O/Fe]? Uncertainty in [O/Fe]stat.error;phys.abunddoublenullable[Mg/Fe]? Log abundance, [Mg/Fe]phys.abunddoublenullablee_[Mg/Fe]? Uncertainty in [Mg/Fe]stat.error;phys.abunddoublenullable[Al/Fe]? Log abundance, [Al/Fe]phys.abunddoublenullablee_[Al/Fe]? Uncertainty in [Al/Fe]stat.error;phys.abunddoublenullable[Si/Fe]? Log abundance, [Si/Fe]phys.abunddoublenullablee_[Si/Fe]? Uncertainty in [Si/Fe]stat.error;phys.abunddoublenullable[K/Fe]? Log abundance, [K/Fe]phys.abunddoublenullablee_[K/Fe]? Uncertainty in [K/Fe]stat.error;phys.abunddoublenullable[CA/Fe]? Log abundance, [Ca/Fe]phys.abunddoublenullablee_[CA/Fe]? Uncertainty in [Ca/Fe]stat.error;phys.abunddoublenullable[CR/Fe]? Log abundance, [Cr/Fe]phys.abunddoublenullablee_[CR/Fe]? Uncertainty in [Cr/Fe]stat.error;phys.abunddoublenullable[Mn/Fe]? Log abundance, [Mn/Fe]phys.abunddoublenullablee_[Mn/Fe]? Uncertainty in [Mn/Fe]stat.error;phys.abunddoublenullable[Ni/Fe]? Log abundance, [Ni/Fe]phys.abunddoublenullablee_[Ni/Fe]? Uncertainty in [Ni/Fe]stat.error;phys.abunddoublenullable[CN/Fe]? Log abundance, [CN/Fe]phys.abunddoublenullablee_[CN/Fe]? Uncertainty in [CN/Fe]stat.error;phys.abunddoublenullable[CNO/Fe]? Log abundance, [CNO/Fe]phys.abunddoublenullablePop[LMg HMg] Assigned Population (2)meta.codechar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar