J/A+A/461/669ivo://CDS.VizieR/J/A+A/461/669doi:10.26093/cds/vizier.34610669CDSRobrade J.Schmitt J.H.M.M.2007-12-10T06:47:10Z2007-12-10T07:42:55ZCDS support team

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

cds-question@unistra.frx-ray-sourceslate-type-starspre-main-sequence-starsLow-mass stars are known to exhibit strong X-ray emission during the early stages of evolution. Nearby star forming regions are ideal targets to study the X-ray properties of pre-main sequence stars. Aims. A deep XMM-Newton exposure is used to investigate X-ray properties of the pre-main sequence population of the Chamaeleon I star forming region. The northern-eastern fringe of the Chameleon I dark cloud was observed with XMM-Newton, revisiting a region observed with ROSAT 15 years ago. Centered on the extended X-ray source CHXR 49 we are able to resolve it into three major contributing components and to analyse their spectral properties. Furthermore, the deep exposure allows not only the detection of numerous, previously unknown X-ray sources, but also the investigation of variability and the study of the X-ray properties for the brighter targets in the field. We use EPIC spectra, to determine X-ray brightness, coronal temperatures and emission measures for these sources, compare the properties of classical and weak-line T Tauri stars and make a comparison with results from the ROSAT observation.2007A&A...461..669Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/461/669CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)B/denis : The DENIS database (DENIS Consortium, 2005)IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/461/669https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/461/669http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/461/669https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/461/669https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/461/669http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/461/669GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/461/669/table4 (X-ray source list in Cha I dark cloud)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/461/669/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/461/669/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/461/669/table4?GETtext/xml+votable180.050000true166.992083-76.4120830.0055555555555555566/36957 37128https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/461/669?format=asciiX-raydefaultJ/A+A/461/669/table4X-ray source list in Cha I dark cloudNamesOther names (3)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCHXX[1/71]+ Sequential numbermeta.recordintprimaryindexedRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maine_PosPositional errorarcsecstat.errorintCRPN? PN count-rate in 0.5-7.5keV band (1)0.1ct/sphot.count;em.X-rayfloatnullablen_CRPN[P] P if source without useful data by the detector PNmeta.notecharCRPNs? PN count-rate in 0.5-1.0keV bandct/sphot.count;em.X-raydoublenullableCRPNm? PN count-rate in 1.0-2.0keV bandct/sphot.count;em.X-raydoublenullableCRPNh? PN count-rate in 2.0-7.5keV bandct/sphot.count;em.X-raydoublenullableCRMOS1? MOS1 count-rate in 0.5-7.5keV band (1)0.1ct/sphot.count;em.X-rayfloatnullablen_CRMOS1[M1 ] M1 if source without useful data by the detector M1meta.notecharCRMOS1s? MOS1 count-rate in 0.5-1.0keV bandct/sphot.count;em.X-raydoublenullableCRMOS1m? MOS1 count-rate in 1.0-2.0keV bandct/sphot.count;em.X-raydoublenullableCRMOS1h? MOS1 count-rate in 2.0-7.5keV bandct/sphot.count;em.X-raydoublenullableCRMOS2? MOS2 count-rate in 0.5-7.5keV band (1)0.1ct/sphot.count;em.X-rayfloatnullableCRMOS2s? MOS2 count-rate in 0.5-1.0keV bandct/sphot.count;em.X-raydoublenullableCRMOS2m? MOS2 count-rate in 1.0-2.0keV bandct/sphot.count;em.X-raydoublenullableCRMOS2h? MOS2 count-rate in 2.0-7.5keV bandct/sphot.count;em.X-raydoublenullable2M/D-ID2MASS (2M) or DENIS (D) identification (2)meta.idchar