J/ApJ/753/64ivo://CDS.VizieR/J/ApJ/753/64doi:10.26093/cds/vizier.17530064CDSIshigaki M.N.Chiba M.Aoki W.2017-06-21T08:21:42Z2014-03-12T09:01:51ZCDS support team

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

cds-question@unistra.frchemical-abundanceshalo-starsmilky-way-galaxyline-intensitieswe present the abundance analysis of 97 nearby metal-poor (-3.3<[Fe/H]<-0.5) stars having kinematic characteristics of the Milky Way (MW) thick disk and inner and outer stellar halos. The high-resolution, high-signal-to-noise optical spectra for the sample stars have been obtained with the High Dispersion Spectrograph mounted on the Subaru Telescope. Abundances of Fe, Mg, Si, Ca, and Ti have been derived using a one-dimensional LTE abundance analysis code with Kurucz NEWODF model atmospheres. By assigning membership of the sample stars to the thick disk, inner halo, or outer halo components based on their orbital parameters, we examine abundance ratios as a function of [Fe/H] and kinematics for the three subsamples in wide metallicity and orbital parameter ranges. We show that, in the metallicity range of -1.5<[Fe/H]<=-0.5, the thick disk stars show constantly high mean [Mg/Fe] and [Si/Fe] ratios with small scatter. In contrast, the inner and the outer halo stars show lower mean values of these abundance ratios with larger scatter. The [Mg/Fe], [Si/Fe], and [Ca/Fe] for the inner and the outer halo stars also show weak decreasing trends with [Fe/H] in the range [Fe/H]>-2. These results favor the scenarios that the MW thick disk formed through rapid chemical enrichment primarily through Type II supernovae of massive stars, while the stellar halo has formed at least in part via accretion of progenitor stellar systems having been chemically enriched with different timescales.2012ApJ...753...64Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/753/64CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/749/77 : MW halo. III. Stat. chemical abundances (Schlaufman+, 2012)J/A+A/530/A15 : Abundances of 94 stars (Nissen+, 2011)J/ApJ/711/573 : Detailed abundances in a halo stellar stream (Roederer+, 2010)J/ApJ/706/1095 : Chemical compositions of 26 outer halo stars (Zhang+, 2009)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/753/64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/753/64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/753/64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/753/64https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/753/64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/753/64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/753/64/stars (Kinematics and atmospheric parameters and abundances of the sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/753/64/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/753/64/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/753/64/stars?GETtext/xml+votable180.050000true230.66691031.26485220.0055555555555555566/4184 4376 5621 5622 7186 7456 8195 8221 8460 8474 8917 9065 10359 10404 10757 11197 11920 12793 13132 13829 14576 14674 14679 15658 16115 16935 16955 17039 17099 17280 17412 18561 19076 19083 19342 20542 21926 24685 24733 24775 24942 25051 25835 25891 26025 26109 26176 26344 26347 26534 26552 26576 26589 27091 27330 27394 27763 27767 27915 28154 28421 28966 29175 29451 29596 29703 30179 30528 30577 30622 30687 30907 30939 31411 32639 34251 35551 36474 36755 40222 43445 43786 44208 44245 44771 44793 44816 44907 46510 46909 46923 47092 47094 48731 48736 48937 48946https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/753/64?format=asciiOpticaldefaultJ/ApJ/753/64/starsKinematics and atmospheric parameters and abundances of the samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharprimary[Fe/H][-3.3/-0.5] Metallicity (1)log(Sun)phys.abund.ZfloatRVel[-372/431] Radial velocity (2)km/sphys.veloc;pos.heliocentricfloate_RVel[0.1/0.8] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatVrVelocity of cylindrical radial componentkm/sphys.velocfloate_VrUncertainty in Vrkm/sstat.errorfloatVphiVelocity of cylindrical azimuthal componentkm/sphys.velocfloate_VphiUncertainty in Vphikm/sstat.errorfloatVzVelocity of cylindrical vertical componentkm/sphys.velocfloate_VzUncertainty in Vzkm/sstat.errorfloatPTD[0/1] Membership probability for thick disk (3)stat.fit.goodnessfloatPH[0/1] Membership probability for inner halo (3)stat.fit.goodnessfloatPOH[0/1] Membership probability for outer halo (3)stat.fit.goodnessfloatTeff[4048/6881] Effective temperatureKphys.temperature.effectiveintlog(g)[0.4/5] Log of surface gravitylog(cm.s**-2)phys.gravityfloatVt[0.04/2.5] Micro-turbulence velocitykm/sphys.veloc.microTurbfloat[FeI/H][-3.3/-0.5] Log of Fe I/H abundancelog(Sun)phys.abundfloate_[FeI/H][0.08/0.4] Uncertainty in [FeI/H]log(Sun)stat.error;phys.abundfloat[FeII/H][-3.3/-0.6] Log of Fe II/H abundancelog(Sun)phys.abundfloate_[FeII/H][0.1/0.8] Uncertainty in [FeII/H]log(Sun)stat.error;phys.abundfloat[Mg/Fe][-0.1/0.7]? Log of Mg/Fe abundancelog(Sun)phys.abundfloatnullablee_[Mg/Fe]? Uncertainty in [Mg/Fe]log(Sun)stat.error;phys.abundfloatnullable[Si/Fe][-0.2/0.7]? Log of Si/Fe abundancelog(Sun)phys.abundfloatnullablee_[Si/Fe]? Uncertainty in [Si/Fe]log(Sun)stat.error;phys.abundfloatnullable[Ca/Fe][-0.1/0.6]? Log of Ca/Fe abundancelog(Sun)phys.abundfloatnullablee_[Ca/Fe]? Uncertainty in [Ca/Fe]log(Sun)stat.error;phys.abundfloatnullable[TiI/Fe][-0.1/0.9]? Log of Ti I/H abundancelog(Sun)phys.abundfloatnullablee_[TiI/Fe]? Uncertainty in [TiI/Fe]log(Sun)stat.error;phys.abundfloatnullable[TiII/Fe][0.03/0.8]? Log of Ti II/H abundancelog(Sun)phys.abundfloatnullablee_[TiII/Fe]? Uncertainty in [TiII/Fe]log(Sun)stat.error;phys.abundfloatnullableZ09Cross-match with Zhang et al. results (Cat. J/ApJ/706/1095) within 3"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/753/64/table4Equivalent widthsZAtomic numbermeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharStage[1/2] Ionization stage (1=neutral)phys.atmol.ionStage;phys.atmol.ionizationintIonElement and ionization stagephys.atmol.ionStagecharlambda[4114/6751] Line wavelength {lambda} (in {AA})0.1nmem.wl;spect.linedoublelog(gf)[-5.7/0.7] log of the oscillator strengthphys.atmol.oscStrengthfloatr_log(gf)References for log(gf) (1)meta.ref;pos.framecharExPot[0/6] Excitation potentialeVphys.atmol.excitationfloatEW[-1.2/233] Equivalent width of line (in {AA})0.1nmspect.line.eqWidthfloatUsed[0/1]? 1=used in abundance analysis, 0=unusedmeta.noteintnullable