J/A+A/653/A143ivo://CDS.VizieR/J/A+A/653/A143doi:10.26093/cds/vizier.36530143CDSWylie S.M.Gerhard O.E.Ness M.K.Clarke J.P.Freeman K.C.,Bland-Hawthorn J.2024-11-06T20:00:57Z2024-05-15T14:31:34ZCDS support team

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

cds-question@unistra.frgiant-starsspectroscopyradial-velocitychemical-abundancesAims. Spectroscopic surveys have by now collectively observed tens of thousands of stars in the bulge of our Galaxy. However, each of these surveys had unique observing and data processing strategies that led to distinct stellar parameter and abundance scales. Because of this, stellar samples from different surveys cannot be directly combined. Methods. Here we use the data-driven method, The Cannon, to bring 21000 stars from theARGOS bulge survey, including 10000 red clump stars, onto the parameter and abundance scales of the cross-Galactic survey,APOGEE, obtaining rms precisions of 0.10dex, 0.07dex, 74K, and 0.18dex for [Fe/H], [Mg/Fe], T_eff_, and log(g), respectively. The re-calibratedARGOS survey - which we refer to as the A2A survey - is combined with theAPOGEE survey to investigate the abundance structure of the Galactic bulge. Results. We find X-shaped [Fe/H] and [Mg/Fe] distributions in the bulge that are more pinched than the bulge density, a signature of its disk origin. The mean abundance along the major axis of the bar varies such that the stars are more [Fe/H]-poor and [Mg/Fe]-rich near the Galactic centre than in the outer bulge and the long bar region. The vertical [Fe/H] and [Mg/Fe] gradients vary between the inner bulge and the long bar, with the inner bulge showing a flattening near the plane that is absent in the long bar. The [Fe/H] - [Mg/Fe] distribution shows two main maxima, an '[Fe/H]-poor [Mg/Fe]- rich' maximum and an '[Fe/H]-rich [Mg/Fe]-poor' maximum, that vary in strength with position in the bulge. In particular, the outer long bar close to the Galactic plane is dominated by super-solar [Fe/H], [Mg/Fe]-normal stars. Stars composing the [Fe/H]-rich maximum show little kinematic dependence on [Fe/H], but for lower [Fe/H] the rotation and dispersion of the bulge increase slowly. Stars with [Fe/H]<-1dex have a very different kinematic structure than stars with higher [Fe/H]. Conclusions. Comparing with recent models for the Galactic boxy-peanut bulge, the abundance gradients and distribution, and the relation between [Fe/H] and kinematics suggests that the stars comprising each maximum have separate disk origins with the '[Fe/H]-poor [Mg/Fe]-rich' stars originating from a thicker disk than the '[Fe/H]-rich [Mg/Fe]-poor' stars.2021A&A...653A.143Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/653/A143CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/154 : SDSS Release 16 (DR16) (Ahumada+, 2020)J/ApJ/808/16 : The Cannon: a new approach to determine abundances (Ness+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/653/A143https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/653/A143http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/653/A143https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/653/A143https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/653/A143http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/653/A143GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/653/A143/catalog (Final catalog of all A2A stars with position, magnitude and radial velocity data, spectroscopic parameters, and red clump weights)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/653/A143/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/653/A143/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/653/A143/catalog?GETtext/xml+votable180.050000true277.346-33.770.0055555555555555565/7177 7186 7189 7191 7198 7243 7256 7263 7265 7271 7284 7286 7292 7348 7467 10527 10562 10568 10570 10576 10581 10588 10712 10717 11944 11946 11950 6/28674 28686-28689 28703 28705 28707 28716-28717 28725-28727 28732-28733 28735 28737 28739-28742 28750 28755 28761 28768-28770 28776-28778 28796 28798 28880-28881 28930 28936 28941-28943 28952 28954-28955 28965-28967 28971 28976 28978 28984 29028 29030 29032-29033 29049 29051 29057 29059 29078-29079 29122 29128 29130 29135 29140-29142 29148 29157 29295 29304 29306-29307 29381 29867 30209 30212-30213 41439 41461 42079 42101-42103 42122-42123 42126 42144-42146 42148 42196-42197 42252 42254 42261-42263 42268-42269 42291 42293-42295 42297 42300-42301 42312 42323 42329 42331-42334 42336 42338 42344 42356 42358 42368 42852 42854 42856-42857 42865 42867 42873 42876-42877 47804 47806 47851 47854-478557.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/653/A143?format=asciidefaultJ/A+A/653/A143/catalogFinal catalog of all A2A stars with position, magnitude and radial velocity data, spectroscopic parameters, and red clump weightsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintimbinI-mag bin of star (1)meta.codeintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedGLON[] Galactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatAkExtinctionmagphys.absorptionfloatKmagK-magnitudemagphot.mag;em.IR.Kfloat(J-K)0Extinction corrected color (J-K)_0_magphot.color;em.IR.J;em.IR.KfloatloggLog10 of surface gravitylog(cm.s**-2)phys.gravityfloate_loggError in logglog(cm.s**-2)stat.errorfloatTeffEffective temperatureKphys.temperature.effectivedoublee_TeffError in TeffKstat.error;phys.temperature.effectivefloat[Fe/H]Iron-to-Hydrogen ratiophys.abund.Fefloate_[Fe/H]Error in [Fe/H]stat.error;phys.abund.Fefloat[Mg/Fe]Magnesium-to-Iron ratiophys.abundfloate_[Mg/Fe]Error in [Mg/Fe]stat.error;phys.abundfloatVHelioLine-of-sight velocitykm/sphys.veloc;pos.heliocentricdoubleRCWeight[0/1] Weight of star for being red clump (2)stat.weightfloat