J/AJ/127/2659ivo://CDS.VizieR/J/AJ/127/2659doi:10.26093/cds/vizier.51272659CDSRamirez S.V.Rebull L.Stauffer J.Hearty T.Hillenbrand L.Jones B.,Makidon R.Pravdo S.Strom S.Werner M.2023-04-06T16:51:03Z2005-08-20T13:16:01ZCDS 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-photometryvisible-astronomybroad-band-photometryWe present results of a Chandra observation of a field in NGC 2264. The observations were taken with the ACIS-I camera with an exposure time of 48.1ks. We present a catalog of 263 sources, which includes X-ray luminosity, optical and infrared photometry, and X-ray variability information. We found 41 variable sources, 14 of which have a flarelike light curve, and two of which have a pattern of a steady increase or decrease over a 10-hr period. The optical and infrared photometry for the stars identified as X-ray sources are consistent with most of these objects being premain-sequence stars with ages younger than 3Myr.2004AJ....127.2659Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/127/2659CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/AJ/123/1528 : UBV(RI)_C_ and JHK photometry in NGC 2264 (Rebull+, 2002)J/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/A+A/417/557 : Rotation + variability of PMS Stars in NGC 2264 (Lamm, 2004)J/AJ/127/2228 : VRI photometry of PMS stars in NGC 2264 OB (Makidon+, 2004)J/AJ/127/1117 : Halpha emission-line stars in NGC 2264 (Reipurth+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/127/2659https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/127/2659http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/127/2659https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/127/2659https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/127/2659http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/127/2659GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/127/2659/table1 (The catalog of X-Ray Sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/2659/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/2659/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/2659/table1?GETtext/xml+votable180.050000true100.0403759.89398750.005555555555555556Cone search capability for table J/AJ/127/2659/optir (Optical and infra-red sources with X-ray counterparts)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/127/2659/optir?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/127/2659/optir?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/127/2659/optir?GETtext/xml+votable180.050000true100.04166679.8947750.0055555555555555566/23637 236398.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/127/2659?format=asciiX-rayOpticalInfrareddefaultJ/AJ/127/2659/table1The catalog of X-Ray SourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[RRS2004]Chandra source identification number, [RRS2004] NGC 2264 NNN in SimbadintprimaryOIRSimbad column added by the CDScharCXORRSChandra source name (JHHMMSS.s+DDMMSS)charRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainphiOff-axis anglearcminfloatRExtCount extraction radiusarcsecfloatfPSFFraction of the PSF enclosedfloatExpTimeEffective exposure timeksfloatCRCount rate (1)ct/ksfloatFXX-ray flux in units of ergs/cm^2^/s (2)mW.m**-2doublelogLXLogarithm of the X-ray luminosity in units of ergs/s (3)log(1e-07W)floatProbConstant-source probability (4)%intComAdditional comments (5)charJ/AJ/127/2659/optirOptical and infra-red sources with X-ray counterpartsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNamePreviously published name (1)charRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.main[RRS2004]Chandra source identification number, [RRS2004] NGC 2264 NNN in SimbadintUmag? The U-band magnitudemagfloatnullablef_Umag[c] Flag on Umag (2)charBmag? The B-band magnitudemagfloatnullablef_Bmag[c] Flag on Bmag (2)charVmag? The V-band magnitudemagfloatnullablef_Vmag[c] Flag on Vmag (2)charRcmag? The Cousins R-band magnitudemagfloatnullablef_Rcmag[c] Flag on Rcmag (2)charIcmag? The Cousins I band magnitudemagfloatnullablef_Icmag[c] Flag on Icmag (2)charJmag? 2MASS (<II/246>) or Rebull et al. (2002, Cat. <J/AJ/123/1528>) J-band magnitudemagfloatnullablef_Jmag[abc] Flag on Jmag (2)charHmag? 2MASS (<II/246>) or Rebull et al. (2002, Cat. <J/AJ/123/1528>) H-band magnitudemagfloatnullablef_Hmag[ac] Flag on Hmag (2)charKmag? 2MASS (<II/246>) or Rebull et al. (2002, Cat. <J/AJ/123/1528>) K-band magnitudemagfloatnullablef_Kmag[ac] Flag on Kmag (2)charRMS? The Rebull et al. (2002, Cat. J/AJ/123/1528) name, CL* NGC 2264 RMS NNNN in SimbadintnullableSBLThe Sung et al. (1997AJ....114.2644S) name, Cl* NGC 2264 SBL NNNN in Simbadchar2MASSThe 2MASS (<II/246>) namecharONameOther names (1)char