J/A+A/490/1055ivo://CDS.VizieR/J/A+A/490/1055doi:10.26093/cds/vizier.34901055CDSAlbacete-Colombo J.F.Damiani F.Micela G.Sciortino S.Harnden F.R.Jr2017-07-12T15:16:50Z2009-02-21T08:24:30ZCDS support team

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

cds-question@unistra.fropen-star-clustersearly-type-starsx-ray-sourcesWe identify and characterize low-mass stars in the ~3Myr old Trumpler 16 region by means of a deep Chandra X-ray observation, and study their optical and near-IR properties. We compare the X-ray activity of Trumpler 16 stars with the known characteristics of Orion and Cygnus OB2 stars. We analyzed a 88.4ks Chandra ACIS-I observation pointed at the center of Trumpler 16. Because of diffuse X-ray emission, source detection was performed using the PWDetect code for two different energy ranges: 0.5-8.0keV and 0.9-8.0keV. Results were merged into a single final list. We positionally correlated X-ray sources with optical and 2MASS catalogs. Source events were extracted with the IDL-based routine ACIS-Extract. X-ray variability was characterized using the Kolmogorov-Smirnov test and spectra were fitted by using XSPEC. The X-ray spectra of early-type, massive stars were analyzed individually. Our list of X-ray sources consists of 1035 entries, 660 of which have near-IR counterparts and are probably associated with Trumpler 16 members.2008A&A...490.1055Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/490/1055CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/AJ/105/980 : Stellar content of Tr 14 and Tr 16 (Massey+ 1993)J/ApJ/549/578 : BV photometry of Trumpler 14 and 16 (Degioia-Eastwood+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/490/1055https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/490/1055http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/490/1055https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/490/1055https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/490/1055http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/490/1055GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/490/1055/Tr16 (Trumpler 16 source catalog: X-ray sources and fits, near-IR counterparts (tables 1, 2 and 3 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/490/1055/Tr16?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/490/1055/Tr16?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/490/1055/Tr16?GETtext/xml+votable180.050000true160.9114167-59.64242780.0055555555555555566/380168.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/490/1055?format=asciiX-raydefaultJ/A+A/490/1055/Tr16Trumpler 16 source catalog: X-ray sources and fits, near-IR counterparts (tables 1, 2 and 3 of paper)l_JmagLimit lfag on Jmagmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[ADM2008]Sequential numbermeta.recordintCXOTr16Source designation (HHMMSS.ss+DDMMSS.s), CXOTr16 JHHMMSS.ss+DDMMSS.s in Simbadmeta.idcharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.maine_PosError in positionarcsecstat.errorfloatthetaOff-axis angle from the aim point of the observationarcmininstr.offsetfloatsigniSignificance of the source in number of sigma over backgroundstat.fit.goodnessfloatAreaSource extraction areapixphys.angSizeintPSFPSF fraction within the extraction area, assuming E=1.49keV%instr.det.psffloatCtBackground-corrected extracted source counts in the 0.5-8.0keV band (NetCounts)ctphot.count;em.X-rayintCRTTotal count rate in the 0.5-8.0keV bandct/ksphot.count;em.X-rayfloatCRSSoft count rate in the 0.5-2.0keV bandct/ksphot.count;em.X-rayfloatCRHHard count rate in the 2.0-8.0keV bandct/ksphot.count;em.X-rayfloatQ25? Source photon quantile at 25%phot.count;arith.ratiofloatnullableQ50Source photon quantile at 50%phot.count;arith.ratiofloatQ75? Source photon quantile at 75%phot.count;arith.ratiofloatnullableExMedian photon energykeVem.energyfloatlogPks? Kolmogorov-Smirnov probability of non-variabilitystat.fit.goodnessfloatnullableFlagFlag from PWDetect detection code (1)meta.code.errorint2MASS2MASS name (HHMMSSss+DDMMSSs), 2MASS JHHMMSSss+DDMMSSs in Simbadmeta.id.assoccharOffset? Offset X-ray to 2MASS sourcearcsecpos.angDistancefloatnullableJmag? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablel_HmagLimit flag on Hmagmeta.code.errorcharHmag? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablel_KsmagLimit flag on Ksmagmeta.code.errorcharKsmag? 2MASS Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? rms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.KfloatnullableQual? 2MASS JHKs quality flag (1)meta.code.qualcharCflgArtifact contamination, confusion (2)meta.codecharAV? Absorption in V bandmagphot.mag;em.opt.VfloatnullableMass? Estimated source MasssolMassphys.massfloatnullablen_MassNotes (3)meta.notecharCt3Net countsphot.count;em.X-rayintchi2? Best-fit {chi}^2^ valuestat.fit.chi2floatnullablelogNH? Best-fit hydrogen column densitylog(cm**-2)phys.columnDensity;meta.modelledfloatnullablee_logNH? rms uncertainty on logNHlog(cm**-2)stat.errorfloatnullablekT? Best-fit plasma temperaturekeVphys.temperature;meta.modelledfloatnullablee_kT? rms uncertainty on kTkeVstat.error;phys.energyfloatnullablen_kT[*] * for upper limitmeta.notecharlogLXBest-fit X-ray luminositylog(1e-07W)phys.luminosity;em.X-rayfloatNotesOther name or commentsmeta.notechar