J/A+A/649/A83ivo://CDS.VizieR/J/A+A/649/A83doi:10.26093/cds/vizier.36490083CDSFritz T.K.Patrick L.R.Feldmeier-Krause A.Schoedel R.Schultheis M.,Gerhard O.Nandakumar G.Neumayer N.Nogueras-Lara F.Prieto M.A.2023-05-09T08:34:06Z2021-05-18T07:15:00ZCDS support team

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

cds-question@unistra.frmilky-way-galaxysurveysgiant-starsmetallicityeffective-temperatureradial-velocityinfrared-astronomyspectroscopyinfrared-photometryIn the central few degrees of the bulge of the Milky Way there is a flattened structure of gas, dust, and stars, known as the central molecular zone, that is similar to nuclear disks in other galaxies. As a result of extreme foreground extinction, we possess only sparse information about the (mostly old) stellar population of the nuclear disk. In this work we present our KMOS spectroscopic survey of the stars in the nuclear disk reaching the old populations. To obtain an unbiased data set, we sampled stars in the full extinction range along each line of sight. We also observed reference fields in neighboring regions of the Galactic bulge. We describe the design and execution of the survey and present first results. We obtain spectra and five spectral indices of 3113 stars with a median S/N of 67 and measure radial velocities for 3051 stars. Of those, 2735 sources have sufficient S/N to estimate temperatures and metallicities from indices. We derive metallicities using the CO 2-0 and Na I K-band spectral features, where we derive our own empirical calibration using metallicities obtained with higher-resolution observations.We use 183 giant stars for calibration spanning in metallicity from -2.5 to 0.6dex and covering temperatures of up to 5500K. The derived index based metallicities deviate from the calibration values with a scatter of 0.32dex. The internal uncertainty of our metallicities is likely smaller. We use these metallicity measurements, together with the CO index, to derive effective temperatures using literature relations. We publish the catalog in this paper. Our data set complements Galactic surveys such as Gaia and APOGEE for the inner 200pc radius of the Milky Way, which is not readily accessible by those surveys owing to extinction. We will use the derived properties in future papers for further analysis of the nuclear disk.2021A&A...649A..83Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/649/A83CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/295 : Spitzer IRAC survey of the galactic center (Ramirez+, 2008)J/A+A/549/A57 : Young, massive star candidates in Sgr A* (Nishiyama+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/649/A83https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/649/A83http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/649/A83https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/649/A83https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/649/A83http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/649/A83GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/649/A83/tabled1 (Properties of calibrator stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/649/A83/tabled1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/649/A83/tabled1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/649/A83/tabled1?GETtext/xml+votable180.050000true15.8257153-27.88054280.005555555555555556Cone search capability for table J/A+A/649/A83/tablee1 (Properties of stars successfully observed by the survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/649/A83/tablee1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/649/A83/tablee1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/649/A83/tablee1?GETtext/xml+votable180.050000true266.3018-29.013220.0055555555555555565/7206 6/1111 4298 4594 5226 8779 8967 9065 9121 9344 12405 12626 12943 13087 16463 16513 16821 16912 16924 17234 18028 18425 18553 18561 18945 18990 19086 19924 20532 21017 21209 21269 21389 21515 21666 22127 22130 22137 22181 22187 22213 22220 22251 22331-22332 22334 22423-22424 23421 23428 23568 23616 23632 23922 24396 24683 25278 25607 25963 26228 26312 26316 26366 26952 27641 27858 28006 28067 28350 28584 28770 28778 28823 28828 28830-28831 28849 28874 28966 29066 29084 29548 29769 29875 30132 30435 30439 30450 30452 30459 30504 30616 30709 31658 31757 32558 33018 33048 33052 33054 33090 33095 33097 33099 33113 33295 33323 34171 35151 35742 35768 35813 36221 37664 37843 37994 39258 39745 40222 40337 40795 41810 42076 42955 43227 44644 44771 45837 47852-47853 48824 489467.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/649/A83?format=asciiInfrareddefaultJ/A+A/649/A83/tabled1Properties of calibrator starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget Namemeta.id;meta.mainchar[Fe/H]litLiterature metallicityphys.abund.FefloatSimbadNameSimbad column added by the CDSmeta.idcharnullabler_[Fe/H]Source of metallicity (1)meta.refintInstInstrument used for the spectruminstr.setupcharr_Inst[3]? Source of spectrum (2)meta.ref;pos.frameintnullableEWNaNa equivalent width0.1nmspect.line.eqWidthdoubleEWCOCO equivalent width0.1nmspect.line.eqWidthdouble[Fe/H]Metallicity estimatephys.abund.Zdouble_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/649/A83/tablee1Properties of stars successfully observed by the surveyID2Identification number 2meta.id.part;meta.mainintID3Identification number 3meta.id.part;meta.mainint(H-K)0Intrinsic H-K color indexmagphot.color;em.IR.H;em.IR.KfloatExt-orderExtinction ordering parameterphys.absorptionfloatRipples[0/1] Spectral ripples flagmeta.codeintSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID1Identification number 1meta.id.part;meta.mainintRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainGLON[] Galactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latdoubleJmag? J-band magnitude, from Nishiyama et al., 2013ApJ...769L..28N)magphot.mag;em.IR.JdoublenullableHmagH-band magnitude, from Nishiyama et al., 2013ApJ...769L..28N)magphot.mag;em.IR.HfloatKmagK-band magnitude, from Nishiyama et al., 2013ApJ...769L..28N)magphot.mag;em.IR.Kfloat3.6mag? IRAC [3.6]-band magnitude, from Churchwell et al., 2009PASP..121..213Cmagphot.mag;em.IR.3-4umdoublenullable4.5mag? IRAC [4.5]-band magnitude from Churchwell et al., 2009PASP..121..213Cmagphot.mag;em.IR.4-8umdoublenullable5.8mag? IRAC [5.8]-band magnitude from Churchwell et al., 2009PASP..121..213Cmagphot.flux.density;em.IR.4-8umdoublenullable8.0mag? IRAC [8.0]-band magnitude from Churchwell et al., 2009PASP..121..213Cmagphot.flux.density;em.IR.8-15umdoublenullableS/NSignal to noise ratiostat.snrfloatvlosBarycentric line of sight velocitykm/sphys.velocdoublee_vlos? Error of barycentric line of sight velocitykm/sstat.errordoublenullableH20? H20 indexspect.indexfloatnullablee_H20Error of H20 indexstat.errorfloatEWBrgBrackett gamma equivalent width0.1nmspect.line.eqWidthfloate_EWBrgError of Brackett gamma equivalent width0.1nmstat.errorfloatEWNaNa equivalent width0.1nmspect.line.eqWidthfloate_EWNaError of Na equivalent width0.1nmstat.errorfloatEWCaCa equivalent width0.1nmspect.line.eqWidthfloate_EWCaError of Ca equivalent width0.1nmstat.errorfloatEWCOCO equivalent width0.1nmspect.line.eqWidthfloate_EWCOError of CO equivalent width0.1nmstat.errorfloat[Fe/H]? Metallicityphys.abund.Zdoublenullablee_[Fe/H]? Metallicity errorstat.error;phys.abund.Fedoublenullable[Fe/H]a? Alternative metallicity without using Thorsbro samplephys.abund.Fedoublenullable[Fe/H]b? Alternative metallicity without using KMOS/APOGEE samplephys.abund.FedoublenullableTeffEffective temperatureKphys.temperature.effectiveinte_TeffError of effective temperatureKstat.error;phys.temperature.effectiveint