J/MNRAS/494/396ivo://CDS.VizieR/J/MNRAS/494/396doi:10.26093/cds/vizier.74940396CDSFeldmeier-Krause A.Kerzendorf W.Do T.Nogueras-Lara F.Neumayer N.,Walcher C.J.Seth A.Schodel R.De Zeeuw P.T.Hilker M.,Lutzgendorf N.Kuntschner H.Kissler-Patig M.2025-04-02T20:13:02Z2020-06-29T08:00:18ZCDS support team

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

cds-question@unistra.frmilky-way-galaxygalactic-centerlate-type-starsradial-velocityinfrared-photometryWe present stellar metallicity measurements of more than 600 late-type stars in the central 10pc of the Galactic Centre. Together with our previously published KMOS data, this data set allows us to investigate, for the first time, spatial variations of the nuclear star cluster's metallicity distribution. Using the integral-field spectrograph KMOS (VLT), we observed almost half of the area enclosed by the nuclear star cluster's effective radius. We extract spectra at medium spectral resolution and apply full spectral fitting utilizing the PHOENIX library of synthetic stellar spectra. The stellar metallicities range from [M/H]=-1.25dex to [M/H]>+0.3dex, with most of the stars having supersolar metallicity. We are able to measure an anisotropy of the stellar metallicity distribution. In the Galactic north, the portion of subsolar metallicity stars with [M/H]<0.0dex is more than twice as high as in the Galactic south. One possible explanation for different fractions of subsolar metallicity stars in different parts of the cluster is a recent merger event. We propose to test this hypothesis with high- resolution spectroscopy and by combining the metallicity information with kinematic data.2020MNRAS.494..396Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/494/396CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/494/396https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/494/396http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/494/396https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/494/396https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/494/396http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/494/396GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/494/396/tablea1 (Table of stellar parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/494/396/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/494/396/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/494/396/tablea1?GETtext/xml+votable180.050000true266.41144-29.00352110.0055555555555555566/288307.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/494/396?format=asciiInfrareddefaultJ/MNRAS/494/396/tablea1Table of stellar parametersIdIdentifation numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTeffEffective temperatureKphys.temperature.effectiveinte_TeffLower uncertainty of effective temperatureKstat.error;phys.temperature.effectiveintE_TeffUpper uncertainty of effective temperatureKstat.error;stat.maxint[M/H]Metallicityphys.abund.Zfloate_[M/H]Lower uncertainty of metallicitystat.error;phys.abundfloatE_[M/H]Upper uncertainty of metallicitystat.error;stat.maxfloatloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggLower uncertainty of surface gravitylog(cm.s**-2)stat.errorfloatE_loggUpper uncertainty of surface gravitylog(cm.s**-2)stat.error;stat.maxfloatRVRadial velocity in local standard of restkm/sspect.dopplerVeloc;pos.lsrfloate_RVLower uncertainty of radial velocitykm/sstat.errorfloatE_RVUpper uncertainty of radial velocitykm/sstat.error;stat.maxfloatKmagKs-band magnitude (1)magphot.mag;em.IR.Kfloat