J/A+A/477/593ivo://CDS.VizieR/J/A+A/477/593doi:10.26093/cds/vizier.34770593CDSAntokhin I.I.Rauw G.Vreux J.-M.van der Hucht K.A.Brown J.C.2008-04-13T14:52:25Z2008-04-13T14:50:52ZCDS support team

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

cds-question@unistra.frearly-type-starspre-main-sequence-starsx-ray-sourcesX-ray properties of the stellar population in the Carina OB1 association are examined with special emphasis on early-type stars. Their spectral characteristics provide some clues to understanding the nature of X-ray formation mechanisms in the winds of single and binary early-type stars. A timing and spectral analysis of five observations with XMM-Newton is performed using various statistical tests and thermal spectral models. 235 point sources have been detected within the field of view. Several of these sources are probably pre-main sequence stars with characteristic short-term variability. Seven sources are possible background AGNs. Spectral analysis of twenty three sources of type OB and WR 25 was performed. We derived spectral parameters of the sources and their fluxes in three energy bands. Estimating the interstellar absorption for every source and the distance to the nebula, we derived X-ray luminosities of these stars and compared them to their bolometric luminosities. We discuss possible reasons for the fact that, on average, the observed X-ray properties of binary and single early type stars are not very different, and give several possible explanations.2008A&A...477..593Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/477/593CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+AS/128/309 : ubvy-beta photometry of CarOB1 & CarOB2 stars (Kaltcheva 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/477/593https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/477/593http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/477/593https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/477/593https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/477/593http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/477/593GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/477/593/table3 (Cross identification table of X-ray sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/477/593/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/477/593/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/477/593/table3?GETtext/xml+votable180.050000true160.6534583-59.732750.0055555555555555566/380168.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/477/593?format=asciiX-raydefaultJ/A+A/477/593/table2X-ray detectionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/235] Source numbermeta.id;meta.mainintVarVariability status of the source (1)meta.code;src.varcharDataSetData set number(s)meta.number;phys.atmol.numbercharL2PN? Logarithmic likelihood of the detection for the EPIC PN instrumentstat.likelihooddoublenullablecrPN? Total count rate in the whole PN energy band (0.4-10.0 keV), in units of 0.001 counts/smct/sphot.count;em.X-raydoublenullablee_crPN? rms uncertainty on crPNmct/sstat.errorfloatnullablecrPNS? Count rate in the soft PN energy band (0.4-1.0keV)mct/sphot.count;em.X-raydoublenullablee_crPNS? rms uncertainty on crPNSmct/sstat.errorfloatnullablecrPNM? Count rate in the medium PN energy band (1.0-2.5keV)mct/sphot.count;em.X-raydoublenullablee_crPNM? rms uncertainty on crPNMmct/sstat.errorfloatnullablecrPNH? Count rate in the hard PN energy band (2.5-10.0keV)mct/sphot.count;em.X-raydoublenullablee_crPNH? rms uncertainty on crPNHmct/sstat.errorfloatnullableL2MOS1? Logarithmic likelihood of the detection for the EPIC MOS1 instrumentstat.likelihooddoublenullablecrMOS1? Total count rate in the whole MOS1 energy band (0.4-10.0keV)ct/sphot.count;em.X-raydoublenullablee_crMOS1? rms uncertainty on crMOS1ct/sstat.errorfloatnullablecrMOS1S? Count rate in the soft MOS1 energy band (0.4-1.0keV)ct/sphot.count;em.X-raydoublenullablee_crMOS1S? rms uncertainty on crMOS1Sct/sstat.errorfloatnullablecrMOS1M? Count rate in the medium MOS1 energy band (1.0-2.5keV)ct/sphot.count;em.X-raydoublenullablee_crMOS1M? rms uncertainty on crMOS1Mct/sstat.errorfloatnullablecrMOS1H? Count rate in the hard MOS1 energy band (2.5-10.0keV)ct/sphot.count;em.X-raydoublenullablee_crMOS1H? rms uncertainty on crMOS1Hct/sstat.errorfloatnullableL2MOS2? Logarithmic likelihood of the detection for the EPIC MOS2 instrumentstat.likelihooddoublenullablecrMOS2? Total count rate in the whole MOS2 energy band (0.4-10.0keV)ct/sphot.count;em.X-raydoublenullablee_crMOS2? rms uncertainty on crMOS2ct/sstat.errorfloatnullablecrMOS2S? Count rate in the soft MOS2 energy band (0.4-1.0keV)ct/sphot.count;em.X-raydoublenullablee_crMOS2S? rms uncertainty on crMOS2Sct/sstat.errorfloatnullablecrMOS2M? Count rate in the medium MOS2 energy band (1.0-2.5keV)ct/sphot.count;em.X-raydoublenullablee_crMOS2M? rms uncertainty on crMOS2Mct/sstat.errorfloatnullablecrMOS2H? Count rate in the hard MOS2 energy band (2.5-10.0keV)ct/sphot.count;em.X-raydoublenullablee_crMOS2H? rms uncertainty on crMOS2Hct/sstat.errorfloatnullableJ/A+A/477/593/table3Cross identification table of X-ray sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/235] Source numbermeta.id;meta.mainintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.main[AMM2003]? Source number from Albacete-Colombo et al. (2003MNRAS.346..704A)meta.idchar[ESK2003]? Source number from Evans et al. (2003, Cat. <J/ApJ/589/509>)meta.idintnullableN2MASSNumber of 2MASS counterparts within 4.0" radiusmeta.numberintDist? Angular separation between the X-ray source and the infrared counterpartarcsecpos.angDistancefloatnullableJmag? J band magnitude from the 2MASS cataloguemagphot.mag;em.IR.JfloatnullableHmag? H band magnitude from the 2MASS cataloguemagphot.mag;em.IR.HfloatnullableKsmag? K_S_ band magnitude from the 2MASS cataloguemagphot.mag;em.IR.KfloatnullableVmag? V magnitude of the optical counterpartmagphot.mag;em.opt.VfloatnullableB-V? B-V colour of the optical counterpartmagphot.color;em.opt.B;em.opt.VfloatnullableU-B? U-B colour of the optical counterpartmagphot.color;em.opt.U;em.opt.BfloatnullableOptNameName of the optical counterpart (1)meta.idcharSpTypeMK Spectral typesrc.spTypecharRefReference to various optical photometric catalogues (2)meta.refcharMmb? Membership probability from the proper motion study of Cudworth et al. (1993, Cat. <J/AJ/105/1822>)%meta.code.memberintnullableXMMUJSource name according to the naming conventions for serendipitous XMM-Newton sourcesmeta.idchar