J/MNRAS/346/1143ivo://CDS.VizieR/J/MNRAS/346/1143doi:10.26093/cds/vizier.73461143CDSBurningham B.Naylor T.Jeffries R.D.Devey C.R.2024-06-29T20:14:36Z2005-01-16T16:46:21ZCDS 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-sourcesphotometryWe present a VI photometric catalogue towards the open cluster Cr 121. XMM-Newton and ROSAT data are used to discover a low-mass pre-main sequence (PMS) along this sightline. de Zeeuw et al. (1999, Cat. <J/AJ/117/354>) have identified Cr 121 as a moving group, using Hipparcos data, at a distance of 592pc; we reject the scenario that these low-mass PMS stars are associated with that association. By considering the higher mass main sequence stellar membership of the groups along this sightline, the density of low-mass PMS stars and their age spread we argue that the low-mass PMS stars are associated with a young, compact cluster at a distance of 1050pc.2003MNRAS.346.1143Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/346/1143CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/346/1143https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/346/1143http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/346/1143https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/346/1143https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/346/1143http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/346/1143GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/346/1143/table1 (Photometric catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/346/1143/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/346/1143/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/346/1143/table1?GETtext/xml+votable180.050000true103.64470833-23.819072220.005555555555555556Cone search capability for table J/MNRAS/346/1143/table2 (XMM-Newton source list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/346/1143/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/346/1143/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/346/1143/table2?GETtext/xml+votable180.050000true103.55433333-23.928233330.005555555555555556Cone search capability for table J/MNRAS/346/1143/table3 (The reduced ROSAT source list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/346/1143/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/346/1143/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/346/1143/table3?GETtext/xml+votable180.050000true103.255-23.855833330.0055555555555555566/20761 20763-20764 20766https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/346/1143?format=asciiX-rayOpticaldefaultJ/MNRAS/346/1143/table1Photometric cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.intBNJStar designation, Cl* Collinder 121 BNJ N-NNNNcharprimaryn_BNJindicates that the star has an X-ray flux detailed in table2 or 3charRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainindexedXposX positionpixdoubleYposY positionpixdoubleVmag? V magnitudemagfloatnullablee_Vmag? rms uncertainty on Vmagmagfloatnullableq_VmagQuality flag on Vmag (1)charq_IcmagQuality flag on Icmag (1)charV-Ic? Cousins V-I colour indexmagfloatnullablee_V-Ic? rms uncertainty on V-IcmagfloatnullableXpms[pn] X-ray selected pre-main sequence star: 'p' if it is also a proper motion member, 'n' if it is not a proper motion member.charJ/MNRAS/346/1143/table2XMM-Newton source listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intXMMXMM source index number (1)intn_XMM[s] s: source from the S308 XMM-Newton pointingcharRAJ2000XMM Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000XMM Declination (J2000.0)pos.eq.dec;meta.mainOffsetOffset from optical positionarcsecfloatCREPIC count ratect/sfloate_CRrms uncertainty on CRct/sfloatBNJ? Star number for optical counterpartcharOldOld star number, in version before 07-Oct-2004charJ/MNRAS/346/1143/table3The reduced ROSAT source listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intROSATROSAT source index number, [BNJ2003] ROSAT NNintRAJ2000ROSAT Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000ROSAT Declination (J2000.0)pos.eq.dec;meta.mainXposX position in the PSCP FoVpixfloatYposY position in the PSCP FoVpixfloatFluxROSAT flux1e-15W.m**-2floatBNJStar designation, for optical counterpartcharOldOld star number, in version before 07-Oct-2004char