J/ApJ/771/111ivo://CDS.VizieR/J/ApJ/771/111doi:10.26093/cds/vizier.17710111CDSSheets H.A.Bolatto A.D.van Loon J.TH.Sandstrom K.Simon J.D.,Oliveira J.M.Barba R.H.2017-06-21T08:21:49Z2015-02-18T14:04:01ZCDS support team

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

cds-question@unistra.frinfrared-photometryradial-velocitystellar-spectral-typesob-starsmagellanic-cloudsWe present the results of optical spectroscopic follow-up of 125 candidate main sequence OB stars in the Small Magellanic Cloud (SMC) that were originally identified in the S^3^MC infrared imaging survey as showing an excess of emission at 24{mu}m indicative of warm dust, such as that associated with a transitional or debris disks. We use these long-slit spectra to investigate the origin of the 24{mu}m emission and the nature of these stars. A possible explanation for the observed 24{mu}m excess, that these are emission line stars with dusty excretion disks, is disproven for the majority of our sources. We find that 88 of these objects are normal stars without line emission, with spectral types mostly ranging from late-O to early-B; luminosity classes from the literature for a sub-set of our sample indicate that most are main-sequence stars. We further identify 17 emission-line stars, 7 possible emission-line stars, and 5 other objects with forbidden-line emission in our sample. We discover a new O6 Iaf star; it exhibits strong HeII4686{AA} emission but relatively weak NIII4640{AA} emission which we attribute to the lower nitrogen abundance in the SMC. Two other objects are identified with planetary nebulae, one with a young stellar object, and two with X-ray binaries. To shed additional light on the nature of the observed 24{mu}m excess we use optical and infrared photometry to estimate the dust properties of the objects with normal O and B star spectra and compare these properties to those of a sample of hot spots in the Galactic interstellar medium (ISM).2013ApJ...771..111Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/771/111CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/274 : Galactic O-Star Spectroscopic Survey (Sota+, 2014)II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/A+A/550/A107 : RV catalogue of O stars in 30 Doradus (Sana+, 2013)J/ApJ/771/13 : UV-IR photometry of SMC stars (Lepo+, 2013)J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)J/AJ/140/416 : IR photometry of massive stars in the SMC (Bonanos+, 2010)J/ApJ/712/925 : Transition circumstellar disks in Ophiuchus (Cieza+, 2010)J/ApJS/187/228 : H{alpha} profiles of Be stars (Silaj+, 2010)J/PASJ/62/273 : AKARI SMC photometry (Ita+, 2010)J/ApJ/705/1646 : Debris disks in Upper Sco (Carpenter+, 2009)J/ApJ/700/1216 : Spectroscopy of Be stars in open clusters (McSwain+, 2009)J/MNRAS/386/826 : Radial velocities of SMC massive stars (Evans+, 2008)J/A+A/479/541 : VLT-FLAMES survey of massive stars (Hunter+, 2008)J/A+A/462/683 : Velocities in SMC field of NGC 330 (Martayan+, 2007)J/ApJ/655/212 : S3MC IRAC and MIPS photometry (Bolatto+, 2007)J/ApJ/653/675 : Spitzer 24{mu}m photometry of A dwarfs (Su+, 2006)J/A+A/456/623 : VLT-FLAMES survey of massive stars (Evans+, 2006)J/MNRAS/353/601 : 2dF survey of the Small Magellanic Cloud (Evans+, 2004)J/AJ/127/1632 : UBVR(UIT) photometry of O and OB stars in SMC (Oey+, 2004)J/AJ/123/855 : Magellanic Clouds Photometric Survey: SMC (Zaritsky+, 2002)J/AcA/48/147 : OGLE SMC BVI photometry (Udalski+ 1998)J/MNRAS/289/225 : SMC HI shells velocities (Staveley-Smith+ 1997)J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)J/A+AS/102/451 : Emission-line stars and PNe in the SMC (Meyssonnier+ 1993)J/PASP/105/1127 : Distribution of Dust in Solar Neighborhood (Gaustad+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/771/111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/771/111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/771/111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/771/111https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/771/111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/771/111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/771/111/dustyob (SMC dusty O and B stars: optical-IR photometry and spectral type and radial velocities)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/771/111/dustyob?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/771/111/dustyob?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/771/111/dustyob?GETtext/xml+votable180.050000true10.90234-73.040780.0055555555555555566/33294 33295 33298 33304 33306 33316 33317 333282.4016587514425055e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/771/111?format=asciiInfraredOpticaldefaultJ/ApJ/771/111/dustyobSMC dusty O and B stars: optical-IR photometry and spectral type and radial velocitiesCommCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.idcharRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainF(B)[644/12398]? OGLE-II B-band fluxuJyphot.flux.density;em.opt.BfloatnullableF(V)[945/8529] OGLE-II V-band fluxuJyphot.flux.density;em.opt.VfloatF(I)[525/5186] OGLE-II I-band fluxuJyphot.flux.density;em.opt.IfloatF(J)[353/5376]? 2MASS J-band fluxuJyphot.flux.density;em.IR.Jfloatnullabler_F(J)[a] a: Original S^3^MC data pointmeta.ref;pos.framecharF(H)[253/5601]? 2MASS H-band fluxuJyphot.flux.density;em.IR.Hfloatnullabler_F(H)[a] a: Original S^3^MC data pointmeta.ref;pos.framecharF(K)[168/7522]? 2MASS Ks-band fluxuJyphot.mag;em.IR.Kfloatnullabler_F(K)[a] a: Original S^3^MC data pointmeta.ref;pos.framecharSCatCross-match within 1" with SMC catalogs (OGLE SMC, J/AcA/48/147; SAGE SMC, II/305; Oey et al. 2004, J/AJ/127/1632 and Zaritsky et al. 2002, J/AJ/123/855meta.ref.urlintnullableSEDSimbad column added by the CDSmeta.ref.urlchar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246) within 1"meta.ref.urlcharF3.6[47/9138]? Spitzer/IRAC 3.6um fluxuJyphot.mag;em.IR.3-4umfloatnullabler_F3.6[b] b: Original S^3^MC data pointmeta.ref;pos.framechare_F3.6[1/467]? F3.6 uncertaintyuJystat.errorfloatnullableF4.5[32/14030] Spitzer/IRAC 4.5um fluxuJyphot.mag;em.IR.4-8umfloatr_F4.5[b] b: Original S^3^MC data pointmeta.ref;pos.framechare_F4.5[1/514] F4.5 uncertaintyuJystat.errorfloatF5.8[58/37120]? Spitzer/IRAC 5.8um fluxuJyphot.flux.density;em.IR.4-8umfloatnullabler_F5.8[b] b: Original S^3^MC data pointmeta.ref;pos.framechare_F5.8[5/1022]? F5.8 uncertaintyuJystat.errorfloatnullableF8.0[45/100300]? Spitzer/IRAC 8.0um fluxuJyphot.flux.density;em.IR.8-15umdoublenullabler_F8.0[b] b: Original S^3^MC data pointmeta.ref;pos.framechare_F8.0[8/8321]? F8.0 uncertaintyuJystat.errorfloatnullableF24[430/1632290] Spitzer/MIPS 24um flux (1)uJyphot.flux.density;em.IR.15-30umdoubler_F24[b] b: Original S^3^MC data pointmeta.ref;pos.framechare_F24[22/1265] F24 uncertainty (1)uJystat.errorfloatF70[41055/11107800]? Spitzer/MIPS 70um flux (1)uJyphot.flux.density;em.IR.30-60umdoublenullabler_F70[b] b: Original S^3^MC data pointmeta.ref;pos.framechare_F70[2123/36591]? F70 uncertainty (1)uJystat.errordoublenullableSeq[1/193] Identifier numbermeta.id;meta.mainintE4.5[-101/13516] 4.5um excessuJyphot.flux;arith.ratiointe_E4.5[3/517] E4.5 uncertaintyuJystat.errorintR4.5[-0.4/36.3] 4.5um excess to expected photosphere ratiophot.flux;arith.ratiofloate_R4.5[0.05/4] R4.5 uncertaintystat.errorfloatE8.0[9/100122]? 8.0um excessuJyphot.flux;arith.ratiointnullablee_E8.0[9/8321]? E8.0 uncertaintyuJystat.errorintnullableR8.0[0.2/562]? 8.0um excess to expected photosphere ratiophot.flux;arith.ratiofloatnullablee_R8.0[0.2/78]? R8.0 uncertaintystat.errorfloatnullableE24[425/1632264] 24um excessuJyphot.flux;arith.ratiointe_E24[23/1265] E24 uncertaintyuJystat.errorintR24[30/69138] 24um excess to expected photosphere ratiophot.flux;arith.ratiointe_R24[3/7623] R24 uncertaintystat.errorintK-24[3.3/11]? K-[24] color indexmagphot.color;em.IR;em.IRfloatnullableSpTThis work MK spectral type (2)src.spTypecharSpTlMK spectral type(s) from literaturesrc.spTypecharRVl[103/250]? Radial velocity from literaturekm/sphys.veloc;pos.heliocentricintnullablee_RVl[3/17]? RVl uncertaintykm/sstat.errorintnullableRVl2? Second radial velocity from literaturekm/sphys.veloc;pos.heliocentricintnullablee_RVl2? RVl2 uncertaintykm/sstat.errorintnullableRefReference(s) (3)meta.ref;pos.framecharRV[119/180]? HI radial velocitykm/sphys.veloc;pos.heliocentricintnullableRV2? Second value of HI radial velocitykm/sphys.veloc;pos.heliocentricintnullableRV2r? Upper range of HI radial velocity (implies RV2 is a lower range)km/sphys.veloc;pos.heliocentricintnullableRV3? Third value of HI radial velocitykm/sphys.veloc;pos.heliocentricintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar