J/A+A/455/903ivo://CDS.VizieR/J/A+A/455/903doi:10.26093/cds/vizier.34550903CDSFlaccomio E.Micela G.Sciortino S.2017-06-30T05:47:50Z2007-04-20T13:39:00ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsx-ray-sourcesinfrared-photometryThis paper's goal is to improve the member census of the NGC 2264 star-forming region and study the origin of X-ray activity in young PMS stars. We analyze a deep, 100ks long, Chandra ACIS observation covering a 17'x17' field in NGC 2264. The preferential detection in X-rays of low-mass PMS stars gives strong indications of their membership. We study X-ray activity as a function of stellar and circumstellar characteristics by correlating the X-ray luminosities, temperatures, and absorptions with optical and near-infrared data from the literature.2006A&A...455..903Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/455/903CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/345/521 : BVRI photometry of NGC 2264 (Flaccomio+, 1999)J/A+A/355/651 : HRI observations of PMS stars in NGC 2264 (Flaccomio+, 2000)J/AJ/123/1528 : UBV(RI)_C_ and JHK photometry in NGC 2264 (Rebull+, 2002)J/A+A/417/557 : Rotation + variability of PMS Stars in NGC 2264 (Lamm, 2004)J/AJ/127/1117 : Halpha emission-line stars in NGC2264 (Reipurth+, 2004)J/AJ/127/2659 : CHANDRA observations of NGC 2264 (Ramirez+, 2004)J/A+A/430/1005 : VRIH{alpha} photometry of NGC 2264 variables (Lamm+, 2005)J/AJ/129/829 : H{alpha} emission stars in NGC 2264 (Dahm+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/455/903https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/455/903http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/455/903https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/455/903https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/455/903http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/455/903GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/455/903/sources (Catalog of X-ray ACIS detections and optical/NIR properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/455/903/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/455/903/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/455/903/sources?GETtext/xml+votable180.050000true100.10759.490.005555555555555556Cone search capability for table J/A+A/455/903/table3 (Master catalog of objects in the ACIS FOV)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/455/903/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/455/903/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/455/903/table3?GETtext/xml+votable180.050000true100.0933339.4675560.0055555555555555566/23637https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/455/903?format=asciiX-rayInfrareddefaultJ/A+A/455/903/sourcesCatalog of X-ray ACIS detections and optical/NIR propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintACIS[1/420] Sequential source number (G2)meta.id;meta.mainintprimaryRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainRadSource radiusarcsecphys.angSize;srcfloatOffAxisDistance from the Chandra optical axisarcminphys.veloc.angfloatCtSource net counts in the 0.2-7keV bandctphot.count;em.X-rayfloatExpTimeEffective exposure timestime.duration;obs.exposureintSigniSignificance of the detectionstat.likelihood;obsfloatVarKS variability test probabilitystat.fit.goodness;src.varfloatnH? Hydrogen column density1e+22cm**-2phys.columnDensityfloatnullablen_nHSource for nH (Av, JHK or X)meta.notecharModModel used (G1)instr.setup;meta.modelledcharFX(u)? Observed X-ray fluxmW.m**-2phot.flux;em.X-rayfloatnullableIcmag? Cousins I magnitudemagphot.mag;em.opt.IfloatnullableR-Ic? Cousins R-I colour indexmagphot.color;em.opt.R;em.opt.IfloatnullableJmag? J magnitudemagphot.mag;em.IR.JfloatnullableHmag? H magnitudemagphot.mag;em.IR.HfloatnullableKmag? K magnitudemagphot.mag;em.IR.KfloatnullableSpTypeMK spectral typesrc.spTypecharAv? Absorptionmagphot.magfloatnullableAv(JHK)? Absorption from JHKmagphys.absorptionfloatnullablelogTeff? Effective temperaturelog(K)phys.temperature.effectivefloatnullablelogLbol? Bolometric luminositylog(solLum)phys.luminosityfloatnullableMass? MasssolMassphys.massfloatnullablelogAge? Agelog(yr)time.agefloatnullableProt? Rotational perioddtime.periodfloatnullableJ/A+A/455/903/table3Master catalog of objects in the ACIS FOVrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/1598] Sequential number (not [FMS2006b])meta.recordintMm[*] *: A likely NGC 2264 membermeta.code.membercharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainRadRadiusarcsecphys.angSize;srcfloatACIS[1/420]? ACIS number (G2)meta.idintnullablef_ACIS[+] +: Entry also present in another rowmeta.codechar2MASS2MASS designationmeta.idcharRMS? Rebull et al., 2002, Cat. <J/AJ/123/1528> number, Cl* NGC 2264 RMS NNNN in Simbadmeta.idintnullablen_RMS[+] +: Entry also present in another rowmeta.notecharLBM? Lamm et al., 2004, Cat. <J/A+A/417/557> number, Cl* NGC 2264 LBM NNNNN in Simbadmeta.idintnullableFMS? Flaccomio et al., 2000, Cat. J/A+A/355/651 number, [FMS2000] XNNN in Simbadmeta.idintnullablen_FMS[+] +: Entry also present in another rowmeta.notecharW56? Walker 1956ApJS....2..365W number NGC 2264 NNN in Simbadmeta.idintnullableDS? Dahm & Simon, 2005, Cat. <J/AJ/129/829> number, Cl* NGC 2264 DS NNN in Simbadmeta.idintnullablel_CRLimit flag on CRmeta.code.errorcharCR? Count rate0.0001count.s**-1phot.count;em.X-rayfloatnullableJ/A+A/455/903/table6Spectral properties of ACIS sources with >50 countsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintACIS[1/420] Sequential number (G2)meta.id;meta.mainintModAdopted model (G1)stat.param;meta.modelledcharn_Mod[abc] Note on Mod (1)meta.notecharr_nHSource of the adopted nH (Av, JHK or X)meta.bibcharPnullNull hypothesis probabilitystat.fit.goodnessfloatnHAdopted hydrogen column density1e+22cm**-2phys.columnDensityfloatnHl? Lower value of nH interval1e+22cm**-2phys.columnDensityfloatnullablenHu? Upper value of nH interval1e+22cm**-2phys.columnDensityfloatnullablekT1Model 1 plasma temperaturekeVstat.fit.paramfloatkT1lLower value of kT1 intervalkeVstat.fit.paramfloatkT1uUpper value of kT1 intervalkeVstat.fit.paramfloatn1Model 1 normalizationstat.fit.paramfloatn1l? Lower value of n1 intervalstat.fit.paramfloatnullablen1uUpper value of n1 intervalstat.fit.paramfloatkT2? Model 2 plasma temperaturekeVphys.temperature;meta.modelledfloatnullablekT2l? Lower value of kT2 intervalkeVstat.fit.paramfloatnullablekT2u? Upper value of kT2 intervalkeVstat.fit.paramfloatnullablen2? Model 2 normalizationstat.fit.paramfloatnullablen2l? Lower value of n2 intervalstat.fit.paramfloatnullablen2u? Upper value of n2 intervalstat.fit.paramfloatnullablelogFX(a)Absorption-corrected flux in [0.5-7]keV bandlog(mW.m**-2)phot.flux;em.X-rayfloatlogFX(u)Observed flux in [0.5-7]keV bandlog(mW.m**-2)phot.flux;em.X-rayfloat