J/ApJ/822/L5ivo://CDS.VizieR/J/ApJ/822/L5doi:10.26093/cds/vizier.18229005CDSMessineo M.Zhu Q.Menten K.M.Ivanov V.D.Figer D.F.Kudritzki R.-P.,Rosie Chen C.-H.2018-10-08T11:54:53Z2018-02-20T07:00:39ZCDS support team

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

cds-question@unistra.frmilky-way-galaxysupergiant-starsinfrared-astronomyspectroscopyline-intensitiesstellar-spectral-typesIn this Letter, we present a search for Galactic red supergiant stars (RSGs) in the direction of the inner Galaxy. A total of 94 targets selected from the 2MASS (Cat. VII/233) and GLIMPSE I North (Benjamin et al. 2003, Cat. II/293; Churchwell et al. 2009PASP..121..213C) catalogs - via their blue extinction-free Q1 and Q2 colors - were spectroscopically observed at infrared wavelengths (in the H- and K-bands at R~1000), and an extraordinary high detection rate of RSGs (>61%) was found. We identified spectroscopically 58 RSGs, based on their flat continua and large equivalent widths of the CO-band at 2.293 {mu}m (EW>45 {AA}). This increase corresponds to about 25% of previously known RSGs in the Galactic region 10{deg}<l<60{deg}, -1.1{deg}<b<1.1{deg}. In order to confirm the location of the new RSGs in the inner Galaxy, distances were estimated for a subsample of 47 stars with the clump method and found to range from 3.6+/-0.4 to 8.6+/-0.7 kpc. The large new sample will allow us to investigate Galactic metallicity gradients as a function of galactocentric distances and azimuthal angles. Such information is currently an highly disputed issue to constrain models of Galaxy formation and evolution.2016ApJ...822L...5Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/822/L5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)J/MNRAS/427/3209 : Galactic and MC O-AGBs and RSGs stars (Jones+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/822/L5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/822/L5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/822/L5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/822/L5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/822/L5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/822/L5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/822/L5/table1 (List of Observed Selected Stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/822/L5/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/822/L5/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/822/L5/table1?GETtext/xml+votable180.050000true272.1174583-18.05207780.0055555555555555565/7275 7278 6/14352 29091 29094 29097 29116 29118 29119 29162 29460 29461 29463 29504 29506 29507 29508 29510 29511 29517 29520 29522 29528 29530 29532 29535 30218 30240 30245 30257 30258 30259 30262 30263 30319 30330 30331 30417 30418 30422 30594 30600 30601 30605 30606 30616 30617 30619 30689 30691 30716 30717https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/822/L5?format=asciiInfrareddefaultJ/ApJ/822/L5/table1List of Observed Selected StarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[1/94] Star identification numbermeta.id;meta.mainintn_Star[a] Note on Star (1)meta.notecharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainH20Water index percentage (H_2_0)%spect.indexfloate_H20Uncertainty in H20%stat.errorfloatEW(CO)Equivalent width of the CO-band at 2.293{mu}m ({AA})0.1nmspect.line.eqWidth;em.line.COfloate_EW(CO)Uncertainty in EW(CO)0.1nmstat.errorfloatSpType1Spectral type derived using the relations between spectral types and EWs(CO) for red supergiantssrc.spTypecharSpType2Spectral type derived using the relations between spectral types and EWs(CO) for giantssrc.spTypecharSimbadSimbad column added by the CDSmeta.ref.urlchar