J/A+A/334/609ivo://CDS.VizieR/J/A+A/334/609doi:10.26093/cds/vizier.33340609CDSGuglielmo F.Le Bertre T.Epchtein N.1998-06-22T05:37:35Z1998-06-22T05:36:13ZCDS support team

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

cds-question@unistra.frcarbon-starsinfrared-photometryastronomical-object-identificationWe present JHKL photometry of a sample of 150 IRAS stars in the third and fourth galactic quadrant with |b|<2{deg} selected according to their IRAS colour (0.160<=[12-25]<=1.156). We identify 27 carbon star candidates using the [12-25] vs. K-L two-colour diagram method. Among them, 10 are listed in the Stephenson's catalogue of carbon stars and 17 are new infrared carbon stars (IRCS) candidates. Their distances are found to be larger than 3kpc. These data are combined with previous data to study the space distribution of IRCS. The number density seems to be independent of the galactocentric distance (R) toward the Galactic Center and to decrease exponentially toward the anticenter. At the present stage, it is not possible to disentangle effects such as incompleteness of the sample, different space distribution law and dependence of the luminosity on metallicity. In particular, we suggest that the apparent scarcity of IRCS in the central direction of the Galaxy (R<5kpc) might be due to a selection effect. From the available data, we have found no IRCS within 1kpc of the Galactic Center.1998A&A...334..609Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/334/609CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)III/197 : IRAS Low Resolution Spectra (IRAS team, 1987)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/334/609https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/334/609http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/334/609https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/334/609https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/334/609http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/334/609GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/A+A/334/609/table3ObservationsKmagK magnitudemagphot.mag;em.IR.KfloatIRASIRAS Namemeta.id;meta.maincharprimaryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ-K? J-K colour indexmagphot.color;em.IR.J;em.IR.KfloatnullableH-K? H-K colour indexmagphot.color;em.IR.H;em.IR.KfloatnullableK-LK-L colour indexmagphot.color;em.IR.K;em.IR.3-4umfloat[12-25]Infrared [12-25] colour indexmagphot.color;em.IR;em.IRfloat[25-60]? Infrared [25-60] colour indexmagphot.color;em.IR;em.IRfloatnullableIRASClass? IRAS Low Resolution Spectrometer class (Olnon et al., 1986A&AS...65..607O)src.spTypeintnullableValClassValinhos class (Epchtein et al. 1987A&AS...71...39E)src.classcharVeenClassvan der Veen & Habing class (1988A&A...194..125V)src.classcharIdent[CSI] Identifications indicated in table4.dat (1)meta.notecharJ/A+A/334/609/table4IdentificationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIRASIRAS namemeta.id;meta.maincharprimaryGCVSGeneral Catalogue of Variable Stars (Kholopov et al., 1985, Cat. <II/139>)meta.idcharTMSS? Two Micron Sky Survey (Cat. <II/2>)meta.idintnullableRAFGLRevised Air Force Geophysics Laboratory Infrared Sky Survey (Cat. <II/94>)meta.idcharCGCSStephenson 1989, General Catalog of Cool Galactic Carbon Stars (Cat. <III/156>) or Stephenson 1976, Cat. <III/60> for number preceded by an Smeta.idcharOtherOther names (1)meta.idchar