J/A+A/596/A82ivo://CDS.VizieR/J/A+A/596/A82doi:10.26093/cds/vizier.35960082CDSDamiani F.Micela G.Sciortino S.2020-05-04T11:28:57Z2016-12-05T08:30:14ZCDS support team

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

cds-question@unistra.frNGC 6231 is a massive young star cluster, near the center of the Sco OB1 association. While its OB members are well studied, its low-mass population has received little attention. We present high-spatial resolution Chandra ACIS-I X-ray data, where we detect 1613 point X-ray sources. Our main aim is to clarify global properties of NGC 6231 down to low masses through a detailed membership assessment, and to study the cluster stars' spatial distribution, the origin of their X-ray emission, the cluster age and formation history, and initial mass function. We use X-ray data, complemented by optical and IR data, to establish cluster membership. The spatial distribution of different stellar subgroups also provides highly significant constraints on cluster membership, as does the distribution of X-ray hardness. We perform spectral modelling of group-stacked X-ray source spectra.2016A&A...596A..82Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/596/A82CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/AJ/145/37 : UBVI and H{alpha} CCD photometry of NGC 6231 (Sung+, 2013)J/MNRAS/440/2036 : VPHAS+ survey synthetic colours (Drew+, 2014)J/AJ/115/734 : NGC 6231 UBVRI and H{alpha} photometry (Sung+ 1998)J/A+AS/137/233 : UBVI imaging photometry of NGC 6231 (Baume+, 1999)J/MNRAS/372/661 : XMM view of NGC 6231: OB stars (Sana+, 2006)J/A+A/454/1047 : XMM view of NGC 6231 open cluster (Sana+, 2006)J/MNRAS/386/447 : RV catalogue of O-type stars in NGC 6231 (Sana+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/596/A82https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/596/A82http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/596/A82https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/596/A82https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/596/A82http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/596/A82GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/596/A82/tableb (X-ray, optical, and IR data for Chandra sources in NGC6231)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/596/A82/tableb?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/596/A82/tableb?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/596/A82/tableb?GETtext/xml+votable180.050000true253.32758-41.782390.0055555555555555566/423941.1166583743361574e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/596/A82?format=asciiX-raydefaultJ/A+A/596/A82/tablebX-ray, optical, and IR data for Chandra sources in NGC6231recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqStar numbermeta.idintCXOUIAU X-ray source designation (JHHMMSS.s+DDMMSS)meta.id;meta.maincharRAJ2000? Right ascension (J2000.0)degpos.eq.ra;meta.mainnullableDEJ2000? Declination (J2000.0)degpos.eq.dec;meta.mainnullablee_Pos? Position errorarcsecstat.errorfloatnullableCT? Total X-ray detected countsctphot.count;em.X-rayfloatnullableCR? X-ray count ratect/sphot.count;em.X-rayfloatnullablee_CR? Error on X-ray count ratect/sstat.errorfloatnullablePK-S? Probability of not being constant%statfloatnullableHR1? Hardness ratio 1: bands [0.3-1.2], [1.2-2.2]keVphot.flux;arith.ratiofloatnullableHR2? Hardness ratio 2: bands [1.2-2.2], [2.2-8.0]keVphot.flux;arith.ratiofloatnullablelogLX? log X-ray luminositylog(1e-07W)phys.luminosity;em.X-rayfloatnullablelogLXq? log quiescent X-ray luminositylog(1e-07W)phys.luminosity;em.X-rayfloatnullableSBB? Identifier in SBB (Sung et al., 2013, Cat. J/AJ/145/37)meta.idintnullableVmag? SSB V magnitudemagphot.mag;em.opt.VfloatnullableV-I? SSB V-I Colormagphot.color;em.opt.V;em.opt.IfloatnullableHalphaS? SSB H-alpha indexmagspect.index;em.line.HalphafloatnullableVPHASVPHAS+ identifier (JHHMMSS.s+DDMMSS.s) (Drew et al., DR2, 2016, Cat. II/341)meta.idcharrmag? VPHAS+ r magnitudemagphot.mag;em.opt.Bfloatnullableimag? VPHAS+ i magnitudemagphot.mag;em.opt.IfloatnullableHalphaV? VPHAS+ H-alpha magnitudemagspect.index;em.line.Halphafloatnullable2MASS2MASS identifier (JHHMMSSss+DDMMSSs)meta.idcharJmag? 2MASS J magnitude (Cutri et al., 2003, Cat. II/246)magphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitudemagphot.mag;em.IR.HfloatnullableKmag? 2MASS K magnitudemagphot.mag;em.IR.KfloatnullableGroup? Group from color-magnitude diagrammeta.idintnullableIRexcess[Y] IR-excess flagmeta.codecharHaexcess[Y] H-alpha-excess flagmeta.codecharMass? Derived Star masssolMassmeta.idfloatnullablelogLbol? Star bolometric luminositylog(solLum)phys.luminosityfloatnullable