J/A+A/571/A43ivo://CDS.VizieR/J/A+A/571/A43doi:10.26093/cds/vizier.35710043CDSMessineo M.Zhu Q.F.Ivanov V.D.Figer D.F.Davies B.Menten K.M.,Kudritzki R.P.Chen C.-H.R.2015-03-23T19:38:11Z2015-02-27T15:20:44ZCDS support team

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

cds-question@unistra.frstellar-associationssupergiant-starsphotometryline-intensitiesClear identifications of Galactic young stellar clusters farther than a few kpc from the Sun are rare, despite the large number of candidate clusters. We aim to improve the selection of candidate clusters rich in massive stars with a multiwavelength analysis of photometric Galactic data that range from optical to mid-infrared wavelengths. We present a photometric and spectroscopic analysis of five candidate stellar clusters, which were selected as overdensities with bright stars (K_s_<7mag) in GLIMPSE and 2MASS images. A total of 48 infrared spectra were obtained. The combination of photometry and spectroscopy yielded six new red supergiant stars with masses from 10M_{sun}_ to 15M_{sun}_. Two red supergiants are located at Galactic coordinates (l,b)=(16.7{deg}, -0.63{deg}) and at a distance of about ~3.9kpc; four other red supergiants are members of a cluster at Galactic coordinates (l,b)=(49.3{deg}, +0.72{deg}) and at a distance of ~7.0kpc. Spectroscopic analysis of the brightest stars of detected overdensities and studies of interstellar extinction along their line of sights are fundamental to distinguish regions of low extinction from actual stellar clusters. The census of young star clusters containing red supergiants is incomplete; in the existing all-sky near-infrared surveys, they can be identified as overdensities of bright stars with infrared color-magnitude diagrams characterized by gaps.2014A&A...571A..43Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/571/A43CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/571/A43https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/571/A43http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/571/A43https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/571/A43https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/571/A43http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/571/A43GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/571/A43/stars (Observed targets: infrared counterparts (table3), spectral classifications (table4), and photometric properties (table6))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/571/A43/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/571/A43/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/571/A43/stars?GETtext/xml+votable180.050000true268.5-28.18060830.0055555555555555566/14353 28872 29088 29162 307007.947616174868663e-21 2.6706780932288093e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/571/A43?format=asciiOpticaldefaultJ/A+A/571/A43/starsObserved targets: infrared counterparts (table3), spectral classifications (table4), and photometric properties (table6)Seq[1/48] Sequential numbermeta.recordintprimaryn_Seq[c] JHK magnitudes from UKIDSS (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJ2mag? 2MASS J magnitude (1)magphot.mag;em.IR.JfloatnullableH2mag? 2MASS H magnitude (1)magphot.mag;em.IR.HfloatnullableKs2mag? 2MASS Ks magnitude (1)magphot.mag;em.IR.KfloatnullableImag? Denis I magnitudemagphot.mag;em.opt.IfloatnullableJmag? Denis J magnitudemagphot.mag;em.IR.JfloatnullableKdmag? Denis Ks magnitudemagphot.mag;em.IR.Kfloatnullable[3.6]? Glimpse 3.6um magnitudemagphot.mag;em.IR.3-4umfloatnullable[4.5]? Glimpse 4.5um magnitudemagphot.mag;em.IR.4-8umfloatnullable[5.8]? Glimpse 4.5um magnitudemagphot.flux.density;em.IR.4-8umfloatnullable[8.0]? Glimpse 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloatnullableAmag? MSX A (8.28um) magnitude (2)magphot.flux.density;em.IR.8-15umfloatnullableCmag? MSX C (12.13um) magnitude (2)magphot.flux.density;em.IR.8-15umfloatnullableDmag? MSX D (14.65um) magnitude (2)magphot.flux.density;em.IR.8-15umfloatnullableEmag? MSX E (21.34um) magnitude (2)magphot.flux.density;em.IR.15-30umfloatnullableW1mag? Wise W1 magnitude (3)magphot.mag;em.IR.3-4umfloatnullableW2mag? Wise W2 magnitude (3)magphot.mag;em.IR.4-8umfloatnullableW3mag? Wise W3 magnitude (3)magphot.flux.density;em.IR.8-15umfloatnullableW4mag? Wise W4 magnitude (3)magphot.flux.density;em.IR.15-30umfloatnullableBmag? Nomad B magnitudemagphot.mag;em.opt.BfloatnullableVmag? Nomad V magnitudemagphot.mag;em.opt.VfloatnullableRmag? Nomad R magnitudemagphot.mag;em.opt.RfloatnullableQ1mag? Q1 index (Q1=(J-H)-1.8x(H-Ks))phot.color.reddFreefloatnullablee_Q1mag? rms uncertainty on Q1stat.errorfloatnullableQ2mag? Q2 index (Q2=(J-Ks)-2.69x(Ks-[0.8])phot.color.reddFreefloatnullablee_Q2mag? rms uncertainty on Q2stat.errorfloatnullablevar[0/1] Variable flag (1 for variable)meta.code;src.varintEWCO1? UIST CO equivalent width (2.285-2.315{mu}m)0.1nmspect.line.eqWidth;em.line.COintnullableEWCO2? SofIl CO equivalent width (4)0.1nmspect.line.eqWidth;em.line.COintnullableEWCO3? SofIm CO equivalent width (2.285-2.307{mu}m)0.1nmspect.line.eqWidth;em.line.COintnullableSpc1UIST spectral type by assuming a supergiantsrc.spTypecharSpc2SofIl spectral type by assuming a supergiantsrc.spTypecharSpc3SofIm spectral type by assuming a supergiantsrc.spTypecharSpg1UIST spectral type by assuming a giant classsrc.spTypecharSpg2SofIl spectral type by assuming a giant classsrc.spTypecharSpg3SofIm spectral type by assuming a giant classsrc.spTypecharH2O[-4/39]? H_2_O index (2.0525-2.0825{mu}m)%meta.code;spect.index;arith.ratiointnullablen_H2OComment on H2O (Mira or AGB)meta.notecharInstInstrument and mode (5)instr.setupcharRadDistance to center of the stellar overdensityarcminpos.angDistancefloatFieldField designationmeta.id;meta.maincharKsmagKs magnitudemagphot.mag;em.IR.KfloatSpTypeSpectral type (6)src.spTypechar(J-Ks)0Deredenned J-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatAKsJKs? Extinction in Ks band from J-Ks colour indexmagphys.absorptionfloatnullableAKsHKsExtinction in Ks band from H-Ks colour indexmagphys.absorptionfloatAKsIJ? Extinction in Ks band from I-Js colour indexmagphys.absorptionfloatnullableKsMAG? Absolute Ks magnitudemagphys.magAbs;em.IR.Kfloatnullablee_KsMAG? rms uncertainty on KsMAGmagstat.errorfloatnullableMOD[5.9/14.6] Distance modulusmagphot.mag.distModfloate_MOD[0.1/1.4] rms uncertainty on MODmagstat.errorfloatBCKs? Bolometric correction in Ks bandmagphot.mag.bcfloatnullablee_BCKs? rms uncertainty on BCKsmagstat.errorfloatnullableMbol1[-8/0]? Absolute bolometric magnitude obtained via BCKsmagphys.magAbs.bolfloatnullablee_Mbol1? rms uncertainty on Mbol1magstat.errorfloatnullableMbol2[-8/-1]? Absolute bolometric magnitude obtained via direct integrationmagphys.magAbs.bolfloatnullablee_Mbol2? rms uncertainty on Mbol2magstat.errorfloatnullableNotesNotes (7)meta.notechar