J/A+A/357/219ivo://CDS.VizieR/J/A+A/357/219doi:10.26093/cds/vizier.33570219CDSPersi P.Marenzi A.M.Olofsson G.Kaas A.A.Nordh L.Huldtgren M.,Abergel A.Andre Philippe M.Bontemps S.Boulanger F.Burgdorf M.,Casali M.M.Cesarsky C.Copet E.Davies J.I.Falgarone E.Montmerle T.,Perault M.Prusti T.Puget J.L.Sibille F.2003-12-12T16:01:49Z2003-12-12T17:01:38ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinfrared-photometrypre-main-sequence-starsWe present the results of an ISOCAM survey of the Chamaeleon I dark cloud conducted in two broad-band filters at 6.7 and 14.3{mu}m. In an area of 0.59deg^2^. we have detected a total of 282 mid-IR sources with 103 sources observed in both filters. Combining the ISOCAM observations with the I, J, and K_s_ data obtained with DENIS, we have found 108 pre-main-sequence (PMS) stars in the region, of which 34 were previously unidentified. Several of these newly discovered young stellar objects are relatively faint suggesting a population in Cha I of very low mass objects that probably includes brown dwarfs in their early contraction phases. Finally, most of the PMS stars show the spectral index computed between 2.2 and 14.3{mu}m typical of Class II sources. The luminosity function (LF) derived for our detected PMS stars is discussed.2000A&A...357..219Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/357/219CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/350/883 : R CrA ISOCAM observations (Olofsson+, 1999)J/AJ/121/974 : JHK photometry in Cha I (Gomez+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/357/219https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/357/219http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/357/219https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/357/219https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/357/219http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/357/219GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/357/219/table1 (List of known members in Cha I with IR excess)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/357/219/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/357/219/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/357/219/table1?GETtext/xml+votable180.050000true165.604167-77.560.005555555555555556Cone search capability for table J/A+A/357/219/table2 (Positions and photometry of the new members in Cha I with IR excess)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/357/219/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/357/219/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/357/219/table2?GETtext/xml+votable180.050000true165.567917-77.7750.005555555555555556ISO6/36956-36957https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/357/219?format=asciiInfrareddefaultJ/A+A/357/219/table3Physical parameters of the identified ChaI cloud membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameISO Namemeta.id;meta.mainintprimaryA(J)? Absorption in J bandmagphys.absorptionfloatnullableLumStar luminositysolLumphys.luminosityfloatalpha(IR)? IR spectral indexspect.indexfloatnullableSpTypeSpectral type (table3 only)src.spTypecharIDIdentification (table3 only)meta.idcharIRclassIR classsrc.class.colorcharJ/A+A/357/219/table4Physical parameters of new Cha I cloud membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameISO Namemeta.id;meta.mainintprimaryA(J)? Absorption in J bandmagphys.absorptionfloatnullableLumStar luminositysolLumphys.luminosityfloatalpha(IR)? IR spectral indexspect.indexfloatnullableSpTypeSpectral type (table3 only)src.spTypecharIDIdentification (table3 only)meta.idcharIRclassIR classsrc.class.colorcharJ/A+A/357/219/table1List of known members in Cha I with IR excessrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameISO Namemeta.id;meta.mainintprimaryn_Name[*+] *: ISOCAM-DENIS identification uncertainty +: New YSOs candidates proposed by Cambresy et al. (1998A&A...338..977C)meta.notecharRA2000Right ascension (2000)pos.eq.ra;meta.mainDE2000Declination (2000)pos.eq.dec;meta.mainImag? I magnitudemagphot.mag;em.opt.IfloatnullableJmag? J magnitudemagphot.mag;em.IR.JfloatnullableKsmag? Ks magnitudemagphot.mag;em.IR.KfloatnullableF6.7umFlux at 6.7ummJyphot.flux.density;em.IR.4-8umfloate_F6.7umrms uncertainty on F6.7ummJystat.errorfloatF14.3um? Flux at 14.3ummJyphot.flux.density;em.IR.8-15umfloatnullablee_F14.3um? rms uncertainty on F14.3ummJystat.errorfloatnullableIDIdentification (only in table1)meta.idcharr_ID? Reference for ID (1)meta.refintnullableJ/A+A/357/219/table2Positions and photometry of the new members in Cha I with IR excessrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameISO Namemeta.id;meta.mainintprimaryn_Name[*+] *: ISOCAM-DENIS identification uncertainty +: New YSOs candidates proposed by Cambresy et al. (1998A&A...338..977C)meta.notecharRA2000Right ascension (2000)pos.eq.ra;meta.mainDE2000Declination (2000)pos.eq.dec;meta.mainImag? I magnitudemagphot.mag;em.opt.IfloatnullableJmag? J magnitudemagphot.mag;em.IR.JfloatnullableKsmag? Ks magnitudemagphot.mag;em.IR.KfloatnullableF6.7umFlux at 6.7ummJyphot.flux.density;em.IR.4-8umfloate_F6.7umrms uncertainty on F6.7ummJystat.errorfloatF14.3um? Flux at 14.3ummJyphot.flux.density;em.IR.8-15umfloatnullablee_F14.3um? rms uncertainty on F14.3ummJystat.errorfloatnullableIDIdentification (only in table1)meta.idcharr_ID? Reference for ID (1)meta.refintnullable