J/A+A/423/1029ivo://CDS.VizieR/J/A+A/423/1029doi:10.26093/cds/vizier.34231029CDSStelzer B.Micela G.Neuhaeuser R.2006-05-04T20:57:04Z2006-05-04T20:54:27ZCDS support team

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

cds-question@unistra.frx-ray-sourcespre-main-sequence-starsline-intensitiesWe report on a 30ks XMM-Newton observation of the central region of the Cha I star forming cloud. The field includes a substantial fraction of the known pre-main-sequence population of Cha I South, including all thirteen known very-low mass H{alpha} emitters. We detect two bona-fide brown dwarfs (spectral types M 7.5 and M 8) and seven H{alpha} emitting objects near the hydrogen burning mass limit, including six of seven earlier detections by ROSAT.2004A&A...423.1029Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/423/1029CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/357/219 : ISOCAM observations in Cha I. (Persi+, 2000)J/A+AS/114/109 : Cha X-ray sources + optical identifications (Alcala+ 1995)J/AJ/121/974 : JHK photometry in Cha I (Gomez+, 2001)J/AJ/124/1001 : JHKs photometry of Cha I variables (Carpenter, 2002)J/AJ/121/2673 : 3{mu}m survey of the Chamaeleon I dark cloud (Kenyon+, 2001)J/A+A/416/555 : Brown Dwarfs in ChaI Dark Cloud (Lopez-Marti+ 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/423/1029https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/423/1029http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/423/1029https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/423/1029https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/423/1029http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/423/1029GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/423/1029/table2 (X-ray sources detected in the EPIC observation of Cha I at ML>20.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/423/1029/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/423/1029/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/423/1029/table2?GETtext/xml+votable180.050000true166.13625-77.4802780.0055555555555555566/36956https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/423/1029?format=asciiX-raydefaultJ/A+A/423/1029/table2X-ray sources detected in the EPIC observation of Cha I at ML>20.InstrInstrument (1)meta.id;instrcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_XNameindicates that spectral data are detailed in table4meta.ref.urlcharXNameDesignation, XMM-Cha I-NNmeta.id;meta.maincharprimaryRAJ2000X-ray right ascension (J2000)pos.eq.ra;meta.mainDEJ2000X-ray declination (J2000)pos.eq.dec;meta.mainMLMaximum likelihood of source existencestat.likelihoodfloatCtsNumber of broad band source countsctphot.count;em.X-rayfloate_Ctsrms uncertainty on Ctsctstat.errorfloatExpTimeExposition timestime.epochfloatl_HR1Limit flag on HR1meta.code.errorcharHR1? Hardness ratio, HR1 (2)phot.flux;arith.ratiofloatnullablee_HR1? rms uncertainty on HR1stat.errorfloatnullablel_HR2Limit flag on HR2meta.code.errorcharHR2? Hardness ratio, HR2 (2)phot.flux;arith.ratiofloatnullablee_HR2? rms uncertainty on HR2stat.errorfloatnullableNameOptical/IR counterpart (3)meta.idOffOX? Distance between the X-ray source and the counterpartarcsecpos.angDistancefloatnullableOffOX2? Second offset between optical and X-ray positionsarcsecpos.angDistancefloatnullableJ/A+A/423/1029/table35Optical and IR properties for all Cha I members and candidate members in the XMM-Newton FOV, and X-ray luminosities in the 0.4-2.5keV band for d=160pc (tables 3 and 5 of the paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMemb[mc] Spectroscopically confirmed (m) Cha I member or Photometric Cha I candidates (c)meta.id.parent;phot.mag;em.opt.IcharNameOptical/IR designationmeta.idprimarySpTypeMK spectral typesrc.spTypecharr_SpType? Reference for spectral typemeta.bibintnullablel_EWHaLimit flag on EWHameta.code.errorcharEWHa? H{alpha} equivalent width (1)0.1nmspect.line.eqWidth;em.line.HalphafloatnullableEWHa2? Second value of H{alpha} equivalent width (1)0.1nmstat.variance;spect.line.eqWidth;em.line.Halphafloatnullabler_EWHa? Reference for EWHameta.bibintnullabler_EWHa2? Reference for EWHa2meta.bibintnullableVtype[WC-] TTS type (2)meta.notecharA(IJ)Extinction, in I or J band, used to derive Lbolmagphys.absorptionfloatu_A(IJ)Uncertainty flag on A(IJ)meta.code.errorcharn_A(IJ)[*] Note on A(IJ) (3)meta.notecharIJmagI or J magnitude used to derive Lbolmagphot.magfloatBand[IJ] Band in which is the extinction and the magnitudeinstr.bandpasscharr_IJmagReference for magnitudemeta.bibcharlogLbolBolometric luminosity (4)log(solLum)phys.luminosityfloatlogTeffEffective temperature (4)log(K)phys.temperature.effectivefloatl_Age[<= ] Limit flag on Agemeta.code.error;time.agecharAge? Age (4)Myrtime.agefloatnullableMass? Mass (4)solMassphys.massfloatnullablel_logLXLimit flag on logLXmeta.code.errorcharlogLX? X-ray luminosity in the 0.4-2.5keV band for d=160pclog(1e-07W)phys.luminosity;em.X-rayfloatnullablef_logLX[LSN] Method used to derive LX (5)meta.codecharl_log(LX/Lbol)Limit flag on log(LX/Lbol)meta.code.errorcharlog(LX/Lbol)? X-ray to bolometry flux ratiophys.luminosity;arith.ratiofloatnullableKSProb? Probability for variability of the source according to the KS-test%stat.valueintnullableJ/A+A/423/1029/refsReferencesComCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharJ/A+A/423/1029/table4Spectral parameters of bright X-ray sources in the Cha I XMM-Newton field.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXNameDesignation, XMM-Cha I-NNmeta.id;meta.maincharNameOptical/IR designationmeta.idcharCountsNumber of counts in the background-subtracted spectrumctmeta.numberintchi2Reduced {chi}^2^ of best fitstat.fit.chi2;meta.modelledfloatDOFDegree Of Freedomstat.fit.dofintNHAbsorbing hydrogen column density (1)1e+22cm**-2phys.columnDensityfloatkT1First X-ray temperature of 2-component thermal MEKAL modelkeVphys.temperature;meta.modelledfloatkT2Second X-ray temperature of 2-component thermal MEKAL modelkeVfloatlogEM1Emission measure of first temperature component (2)log(mW.m**-2)spect.line.intensityfloatlogEM2Emission measure of second temperature component (2)log(mW.m**-2)stat.variance;spect.line.intensityfloat