J/A+A/713/A288ivo://CDS.VizieR/J/A+A/713/A288CDSSalgado C.Villanova S.Geisler D.Barrera N.Ardern-Arentsen A.2026-09-23T07:46:29Z2026-09-23T08:46:00ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyradial-velocitychemical-abundancesThe inner Milky Way hosts overlapping stellar populations (bar-bulge, inner thin and thick disks, and halo), thus complicating population assignments along the line of sight. A joint chemical-dynamical approach is required to isolate a clean field bulge sample. Metal-poor bulge stars are particularly valuable as they likely trace the earliest phases of chemical enrichment in the inner Galaxy. We characterize the alpha-element (Si, Mg) and selected Fe-peak abundances of a dynamically defined sample of bulge field stars, and contrast these trends with the inner-halo tail in the metal-poor regime. We analyzed metal-poor candidates from the Pristine Inner Galaxy Survey observed by the bulge Cluster APOGEE Survey. Using APOGEE/ASPCAP abundances (S/N>=50), we integrated full 6D orbits in a barred Milky Way potential. Bulge membership was defined via orbital confinement using an apocenter cut and the high-density locus in the (E_J_, L_z_) plane, with uncertainties estimated using Monte Carlo simulations. We identified 98 stars as genuine bulge members. The metallicity distribution spans -2.5<=[Fe/H]<=-0.4, with a median [Fe/H]=-1.71, offset to higher metallicity than the inner halo (median [Fe/H]=-1.96). The sample follows a high-alpha sequence with slopes d[Si/Fe]/d[Fe/H]=-0.020^+0.012^_-0.051_ and d[Mg/Fe]/d[Fe/H]=-0.097^+0.062^_-0.133_. Fe-peak tracers show [Ni/Fe]~0, while [Mn/Fe] declines with [Fe/H] with a mild upturn at higher metallicity. We detect no significant [Si/Fe] gradients with Rapo or Zmax (+0.010^+0.018^_0.000_ and +0.006^+0.022^_-0.011_dex/kpc, respectively). The results are insensitive to the assumed {OMEGA}p, yielding indistinguishable memberships. The chemo-orbital evidence favors an in situ origin within the inner Galaxy for the metal-poor bulge field, enriched at early times and later rearranged by secular bar evolution, with a minor contribution from halo stars at the most metal-poor end.2026A&A...713A.288Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/713/A288CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/703/A267 : CAPOS member stars in 18 globular clusters (Geisler+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/713/A288https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/713/A288http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/713/A288https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/713/A288https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/713/A288http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/713/A288GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/713/A288/table1 (Catalogue of CAPOS--PIGS stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/713/A288/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/713/A288/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/713/A288/table1?GETtext/xml+votable180.050000true255.80732889-26.314763890.0055555555555555565/7296 7304 6/28842-28843 29194-29195 29220https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/713/A288?format=asciidefaultJ/A+A/713/A288/table1Catalogue of CAPOS--PIGS starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClassAdopted dynamical classificationmeta.code.classcharSimbadSimbad column added by the CDSmeta.ref.urlcharPristinePristine identifier (Pristine_HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharGaiaDR3Gaia DR3 source identifiermeta.idAPOGEEAPOGEE identifier (2MHHMMSSss-DDMMSSs)meta.idcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latdoubleSNRAPOGEE signal-to-noise ratiostat.snrdoubleRVAPOGEE heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricdoublee_RVUncertainty in RVkm/sstat.errordoubleRVscatScatter in visit radial velocitieskm/sstat.stdev;phys.velocdoubleTeffASPCAP effective temperatureKphys.temperature.effectivedoublee_TeffUncertainty in TeffKstat.error;phys.temperature.effectivedoubleloggASPCAP surface gravityphys.gravitydoublee_loggUncertainty in loggstat.errordoubleVmicASPCAP microturbulent velocitykm/sphys.velocdouble[Fe/H]ASPCAP iron abundancephys.abund.Fedoublee_[Fe/H]ASPCAP uncertainty in [Fe/H]stat.error;phys.abund.Fedoubleec_[Fe/H]Cluster-calibrated uncertainty in [Fe/H] (1)stat.error;phys.abunddouble[C/Fe]ASPCAP carbon abundance ratiophys.abund;arith.ratiodoublee_[C/Fe]Uncertainty in [C/Fe]stat.error;phys.abunddouble[N/Fe]ASPCAP nitrogen abundance ratiophys.abund;arith.ratiodoublee_[N/Fe]Uncertainty in [N/Fe]stat.error;phys.abunddouble[O/Fe]ASPCAP oxygen abundance ratiophys.abund;arith.ratiodoublee_[O/Fe]Uncertainty in [O/Fe]stat.error;phys.abunddouble[Na/Fe]ASPCAP sodium abundance ratiophys.abund;arith.ratiodoublee_[Na/Fe]Uncertainty in [Na/Fe]stat.error;phys.abunddouble[Mg/Fe]ASPCAP magnesium abundance ratiophys.abund;arith.ratiodoublee_[Mg/Fe]Uncertainty in [Mg/Fe]stat.error;phys.abunddouble[Al/Fe]ASPCAP aluminium abundance ratiophys.abunddoublee_[Al/Fe]Uncertainty in [Al/Fe]stat.error;phys.abunddouble[Si/Fe]ASPCAP silicon abundance ratiophys.abund;arith.ratiodoublee_[Si/Fe]Uncertainty in [Si/Fe]stat.error;phys.abunddouble[Ca/Fe]ASPCAP calcium abundance ratiophys.abund;arith.ratiodoublee_[Ca/Fe]Uncertainty in [Ca/Fe]stat.error;phys.abunddouble[Mn/Fe]ASPCAP manganese abundance ratiophys.abunddoublee_[Mn/Fe]Uncertainty in [Mn/Fe]stat.error;phys.abunddouble[Ni/Fe]ASPCAP nickel abundance ratiophys.abund;arith.ratiodoublee_[Ni/Fe]Uncertainty in [Ni/Fe]stat.error;phys.abunddoubleRperiMedian orbital pericentre radiuskpcphys.size.radius;stat.mediandoubleRapoMedian orbital apocentre radiuskpcphys.size.radius;stat.mediandoubleZmaxMedian vertical orbital excursionkpcsrc.orbital.eccentricitydoubleeccMedian orbital eccentricitysrc.orbital.eccentricity;stat.mediandoubleEJMedian Jacobi energykm**2.s**-2src.orbitaldoubleLzMedian z-component of angular momentumkpc.km/sphys.angMomentum;stat.mediandoubleOmegapBar pattern speedkm.s**-1.kpc**-1phys.veloc.rotatfloat