J/ApJ/397/520ivo://CDS.VizieR/J/ApJ/397/520doi:10.26093/cds/vizier.13970520CDSWILKING B.A.THOMAS P.G.LADA C.J.MEYER M.R.YOUNG E.T.2013-03-05T06:34:03Z1997-12-09T20:47:41ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-sourcesinfrared-photometryWe present an analysis of IRAS data for a 57pc^2^ area of the nearby Corona Australis dark cloud complex. A total of 79 far-infrared sources are detected at 12{mu}m or in at least three IRAS bands. Combining these data with both newly obtained and previously published optical/infrared data, a total of 16 IRAS sources are identified with young stellar objects which are in close proximity to the R Coronae Australis cloud or Rossano Cloud B. Among these objects is a cold, heavily obscured young stellar object, IRAS 32, which radiates only in the 25-100{mu}m bands and is found to be associated with an extended near-infrared nebula. The majority of the remaining 63 IRAS sources in our sample appear to be related to field stars. A total of 24 young stellar objects are now known to be associated with the Cr A cloud and we investigate their collective properties through analysis of their spectral energy distributions. As observed for embedded populations in other dark clouds, the shapes of the spectral energy distributions constitute a nearly continuous sequence from cold, heavily obscured objects (extreme Class I) to T Tauri stars (Class II), with about equal numbers of Class I and Class II sources. There is a hint of a segregation of the shapes of the spectral energy distributions with source luminosity: eight of nine sources with L>1.8L_{sun}_ display Class I or flat energy distributions. We conclude that star formation in the Cr A cloud has proceeded in a manner similar to that in the rho Ophiuchi cloud in terms of duration and efficiency. We attribute the relatively low number of young stellar objects in Cr A to its lower mass of both low-density and high-density molecular gas. The luminosity function of the Cr A sources is unique only by the presence of six intermediate-luminosity (~100L_{sun}_) objects. Either the cloud has formed intermediate-mass stars more efficiently than lower mass objects relative to other dark clouds or several of these objects are interlopers.1992ApJ...397..520Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/397/520CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/397/520https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/397/520http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/397/520https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/397/520https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/397/520http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/397/520GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/397/520/table2 (*IRAS Sources with S(25)/S(12)<0.8.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/397/520/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/397/520/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/397/520/table2?GETtext/xml+votable180.050000true283.849219-37.3867410.005555555555555556Cone search capability for table J/ApJ/397/520/table3 (Near-infrared photometry of IRAS sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/397/520/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/397/520/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/397/520/table3?GETtext/xml+votable180.050000true284.696703-36.8099520.005555555555555556Cone search capability for table J/ApJ/397/520/table1 (*IRAS Sources with S(25)/S(12)>0.8.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/397/520/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/397/520/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/397/520/table1?GETtext/xml+votable180.050000true285.002123-36.6201770.0055555555555555565/11956 11976 6/47733 47734 47735 47737 47739 47740 47741 47742 47828 47908 479125.0692151230857684e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/397/520?format=asciiInfrareddefaultJ/ApJ/397/520/table2*IRAS Sources with S(25)/S(12)<0.8.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNo[]? Source numbermeta.idintnullableRA1950Right ascension 1950pos.eq.ra;meta.mainDE1950Declination 1950pos.eq.dec;meta.mainS12Flux density at 12 {mu}m (1)Jyphot.flux.density;em.IR.8-15umfloatu_S12Uncertainty flag on S12meta.code.errorcharl_S25[<] Limit flag on S25meta.code.errorcharS25Flux density at 25 {mu}m (1)Jyphot.flux.density;em.IR.15-30umfloatu_S25Uncertainty flag on S25meta.code.errorcharl_S60[<] Limit flag on S60meta.code.errorcharS60Flux density at 60 {mu}m (1)Jyphot.flux.density;em.IR.30-60umfloatl_S100[<] Limit flag on S100meta.code.errorcharS100[]? Flux density at 100 {mu}m (1)Jyphot.flux.density;em.IR.60-100umfloatnullablen_S100[c] c indicates source confusionmeta.notecharStarVisible stars? (2)meta.code;src.varcharNotesAssociations, notes (3)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJ/397/520/table3Near-infrared photometry of IRAS sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharRA1950Right ascension 1950pos.eq.ra;meta.mainDE1950Declination 1950pos.eq.dec;meta.mainVisVisibility (1)meta.codecharl_Jmag[>] limit flag on Jmagmeta.code.errorcharJmag[]? J magnitude (2)magphot.mag;em.IR.Jfloatnullablel_Hmag[>] limit flag on Hmagmeta.code.errorcharHmag[]? H magnitude (2)magphot.mag;em.IR.Hfloatnullablee_Hmag[]? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablel_Kmag[>] limit flag on Kmagmeta.code.errorcharKmag[]? K magnitude (2)magphot.mag;em.IR.Kfloatnullablee_Kmag[]? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullablel_Lmag[>] limit flag on Lmagmeta.code.errorcharLmag[]? L magnitude (2)magphot.mag;em.IR.3-4umfloatnullableu_LmagUncertainty flag on Lmagmeta.code.errorcharObsType of observations (CTIO or IRTF)meta.notecharNotesNotes (3)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexedJ/ApJ/397/520/table1*IRAS Sources with S(25)/S(12)>0.8.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNo[]? Source numbermeta.idintnullableRA1950Right ascension 1950pos.eq.ra;meta.mainDE1950Declination 1950pos.eq.dec;meta.mainl_S12[<] Limit flag on S12meta.code.errorcharS12Flux density at 12 {mu}m (1)Jyphot.flux.density;em.IR.8-15umfloatu_S12Uncertainty flag on S12meta.code.errorcharW12[]? Source size deconvolved with a Gaussian beam of 0.76' (12{mu}m)arcminphys.angSize;instr.beamfloatnullableu_W12Uncertainty flag on W12meta.code.errorcharn_W12[p] p indicates that source size is consistent with point sourcemeta.notecharS25Flux density at 25 {mu}m (1)Jyphot.flux.density;em.IR.15-30umfloatu_S25Uncertainty flag on S25meta.code.errorcharW25[]? Source size deconvolved with a Gaussian beam of 0.77' (25{mu}m)arcminphys.angSize;instr.beamfloatnullableu_W25Uncertainty flag on W25meta.code.errorcharn_W25[p] p indicates that source size is consistent with point sourcemeta.notecharl_S60[<] Limit flag on S60meta.code.errorcharS60Flux density at 60 {mu}m (1)Jyphot.flux.density;em.IR.30-60umfloatu_S60Uncertainty flag on S60meta.code.errorcharW60[]? Source size deconvolved with a Gaussian beam of 1.39' (60{mu}m)arcminphys.angSize;instr.beamfloatnullablen_W60[p] p indicates that source size is consistent with point sourcemeta.notecharl_S100[<] Limit flag on S100meta.code.errorcharS100[]? Flux density at 100 {mu}m (1)Jyphot.flux.density;em.IR.60-100umfloatnullableu_S100Uncertainty flag on S100meta.code.errorcharn_S100[c] c indicates source confusionmeta.notecharW100[]? Source size deconvolved with a Gaussian beam of 2.96' (100{mu}m)arcminphys.angSize;instr.beamfloatnullableu_W100Uncertainty flag on W100meta.code.errorcharn_W100[p] p indicates that source size is consistent with point sourcemeta.notecharStarVisible stars? (2)meta.codecharNotesAssociations, notes (3)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed