J/ApJS/173/104ivo://CDS.VizieR/J/ApJS/173/104doi:10.26093/cds/vizier.21730104CDSLuhman K.L.2017-07-11T13:09:29Z2009-07-03T08:34:16ZCDS support team

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

cds-question@unistra.freffective-temperatureinfrared-photometryvisible-astronomyphotometryextinctionpre-main-sequence-starsyoung-stellar-objectsI present a new census of the stellar population in the ChamaeleonI star-forming region. Using optical and near-IR photometry and follow-up spectroscopy, I have discovered 50 new members of ChamaeleonI, expanding the census of known members to 226 objects. Fourteen of these new members have spectral types later than M6, which doubles the number of known members that are likely to be substellar. I have estimated extinctions, luminosities, and effective temperatures for the known members, used these data to construct an H-R diagram for the cluster, and inferred individual masses and ages with the theoretical evolutionary models of Baraffe and Chabrier. The low-mass stars are more widely distributed than members at other masses in the northern subcluster, but this is not the case in the southern subcluster. Meanwhile, the brown dwarfs have the same spatial distribution as the stars out to a radius of 3{deg} (8.5pc) from the center of ChamaeleonI.2007ApJS..173..104Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/173/104CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/416/555 : Brown Dwarfs in ChaI Dark Cloud (Lopez-Marti+ 2004)J/AJ/124/1001 : JHKs photometry of Cha I variables (Carpenter, 2002)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/ApJS/173/104https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/173/104http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/173/104https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/173/104https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/173/104http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/173/104GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/173/104/table1 (Photometry for Candidate Members in Spectroscopic Sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/173/104/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/173/104/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/173/104/table1?GETtext/xml+votable180.050000true157.948625-79.28833330.005555555555555556Cone search capability for table J/ApJS/173/104/memb (Combined table from original tables)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/173/104/memb?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/173/104/memb?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/173/104/memb?GETtext/xml+votable180.050000true163.1539167-74.67463890.005555555555555556Cone search capability for table J/ApJS/173/104/table6 (Derived Properties for Members of Chamaeleon I)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/173/104/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/173/104/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/173/104/table6?GETtext/xml+votable180.050000true161.658125-77.60097220.0055555555555555565/9239 6/36943 36945 36946 36949 36950 36951 36953 36955 37121 37122 37123 37124 37127 37128 37130 37131 37132 371347.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/173/104?format=asciiOpticalInfrareddefaultJ/ApJS/173/104/table1Photometry for Candidate Members in Spectroscopic SamplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSimbad column added by the CDSmeta.ref.urlcharNameName (G1)meta.id;meta.maincharRmag? R band Magnitudemagphot.mag;em.opt.RfloatnullableImag? I band Magnitudemagphot.mag;em.opt.Ifloatnullableimag? DENIS i band Magnitude from 2d releasemagphot.mag;em.opt.IfloatnullableF775W? F775W magnitude from ACS-HST (~i' from SDSS)magphot.mag;em.opt.IfloatnullableF850LP? F850LP magnitude from ACS-HST (~z' from SDSS)magphot.mag;em.opt.IfloatnullableJmag2? 2MASS J band Magnitudemagphot.mag;em.IR.JfloatnullableHmag2? 2MASS H band Magnitudemagphot.mag;em.IR.HfloatnullableKsmag2? 2MASS K_s_ band Magnitudemagphot.mag;em.IR.KfloatnullableJmag? measured J band Magnitude with ISPI (2)magphot.mag;em.IR.JfloatnullableHmag? measured H band Magnitude with ISPI (2)magphot.mag;em.IR.HfloatnullableKsmag? measured K_s_ band Magnitude with ISPI (2)magphot.mag;em.IR.Kfloatnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJS/173/104/membCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSimbad column added by the CDSmeta.ref.urlcharMmSimbad column added by the CDSmeta.code.membercharNameName (G1)meta.id;meta.maincharn_Name[df] Note on the object (1)meta.notecharONameOther designation (2)meta.idcharn_OName[e] Separation of 1.1" and position angle of 19{deg} relative to T39Ameta.notecharl_SpType[<>= ] Limit flag on Spectral Typemeta.code.error;src.spTypecharSpTypeSpectral Type (3)src.spTypecharn_SpType[efgh] Note on Spectral Type (4)meta.notecharMembMembership evidence (5)meta.code.membercharSelBasis of selection (6)meta.codecharNightNight(s) numbermeta.id;obscharRefsReferences (detailed in refs.dat)meta.ref;pos.framechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJS/173/104/table6Derived Properties for Members of Chamaeleon IONameOther designationmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMSimbad column added by the CDSmeta.ref.urlcharNameName (G1)meta.id;meta.maincharl_SpType[>= ] Limit flag on spectral typemeta.code.error;src.spTypecharSpTypeAdopted spectral typesrc.spTypecharl_Teff[<= ] Limit flag on Teffmeta.code.error;phys.temperature.effectivecharTeffEffective temperature, scale from Luhman et al. (2003, Cat. J/ApJ/593/1093)Kphys.temperature.effective;instr.scaleintAJExtinction in J bandmagphys.absorption;em.IR.JfloatLbolBolometric luminositiessolLumphys.luminositydoubleIMF[1,2 ] Initial Mass Functions (1)meta.codechar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJS/173/104/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefNumber of referencemeta.id;meta.mainintBibCodeBibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorchar