J/ApJ/589/509ivo://CDS.VizieR/J/ApJ/589/509doi:10.26093/cds/vizier.15890509CDSEvans N.R.Seward F.D.Krauss M.I.Isobe T.Nichols J.Schlegel E.M.,Wolk S.J.2017-06-22T14:28:57Z2005-09-18T13:30:02ZCDS support team

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

cds-question@unistra.fropen-star-clustersx-ray-sourcesphotometryThe region around the {eta} Carinae Nebula has three OB associations, which contain a Wolf-Rayet star and several massive O3 stars. An early Chandra ACIS-I image was centered on {eta} Car and includes Trumpler 16 and part of Trumpler 14. The Chandra image confirms the well-known result that O and very early B stars are X-ray sources with LX~=10^-7^Lbol over an X-ray luminosity range of about 100. Two new, anomalously strong X-ray sources have been found among the hot star population: Tr 16-244, a heavily reddened O3 I star, and Tr 16-22, a heavily reddened O8.5 V star. Two stars have an unusually large LX/Lbol: HD 93162, a Wolf-Rayet star (and possible binary), and Tr 16-22, a possible colliding-wind binary. In addition, a population of sources associated with cool stars is detected. In the color-magnitude diagram, these X-ray sources sit above the sequence of field stars in the Carina arm. The OB stars are on average more X-ray luminous than the cool star X-ray sources. X-ray sources among A stars have X-ray luminosities similar to those of cooler stars and may be due to cooler companions. Upper limits are presented for B stars that are not detected in X-rays. These upper limits are also the upper limits for any cool companions that the hot stars may have. Hardness ratios are presented for the most luminous sources in bands 0.5-0.9, 0.9-1.5, and 1.5-2.04keV. The available information on the binary nature of the hot stars is discussed, but binarity does not correlate with X-ray strength in a simple way.2003ApJ...589..509Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/589/509CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/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)J/A+AS/116/75 : Region of the open cluster Tr 14 (Vazquez+, 1996)J/AJ/105/1822 : Open clusters near eta Car (Cudworth+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/589/509https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/589/509http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/589/509https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/589/509https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/589/509http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/589/509GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/589/509/table5 (Photometry of Low Mass X-ray sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/589/509/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/589/509/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/589/509/table5?GETtext/xml+votable180.050000true161.3417083-59.681250.005555555555555556Cone search capability for table J/ApJ/589/509/sources (X-ray sources })https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/589/509/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/589/509/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/589/509/sources?GETtext/xml+votable180.050000true161.3189583-59.72691670.005555555555555556Cone search capability for table J/ApJ/589/509/table7 (Non-detections: OB Stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/589/509/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/589/509/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/589/509/table7?GETtext/xml+votable180.050000true160.9998333-59.54063890.0055555555555555566/38016https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/589/509?format=asciiX-rayOpticaldefaultJ/ApJ/589/509/table5Photometry of Low Mass X-ray sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[ESK2003]X-Ray identificationintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainB-V? The (B-V) color indexmagfloatnullableVmag? The V band magnitudemagfloatnullableV-Ic? The (V-Ic) color indexmagfloatnullablen_[ESK2003]Individual notes (1)charJ/ApJ/589/509/sourcesX-ray sources }recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSample[N OB] OB: OB stars, NOB: Not OB starschar[ESK2003]Source numberintprimaryRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainRadThe radial distance from the aim pointarcminfloatTCtsTotal counts from 0.5 to 2.04keVctfloate_TCtsError in TCts (1)ctfloatSCtsSoft counts from 0.5 to 0.9keVctfloate_SCtsError in SCts (1)ctfloatMCtsMedium counts from 0.9 to 1.5keVctfloate_MCtsError in MCts (1)ctfloatHCtsHard counts from 1.5 to 2.04keVctfloate_HCtsError in HCts (1)ctfloatHRMSThe (Medium-Soft)/(Medium+Soft) ratiofloate_HRMSError on HRMS (1)floatHRHM? The (Hard-Medium)/(Hard+Medium) ratiofloatnullablee_HRHM? Error on HRHM (1)floatnullablelogFXLog of the X-ray Flux in erg/cm^2^/s (2)log(mW.m**-2)floate_logFXError on logFXlog(mW.m**-2)floatlogLXLog of the X-ray luminosity in erg/s (2)log(1e-07W)floate_logLXError in logLXlog(1e-07W)floatJ/ApJ/589/509/tab68X-Ray Sources: Hot Star Identifications and Binaries Velocities (tables 6 and 8 of the paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameOptical identification (1)char[ESK2003]? Sequential numberintnullableVmagV magnitude (1)magfloatSpTypeMK spectral typecharE(B-V)Extinction in B-V (1)magfloatMbolBolometric magnitude (2)magfloatlog(LX/Lbol)X-ray luminosity to bolometric luminosity ratiofloatBin[YN] Binary statuscharu_BinUncertainty flag on BincharPorb? Orbital perioddfloatnullablePorb2? Second orbital perioddfloatnullabler_PorbReference for Porb, separated by comma (3)charJ/ApJ/589/509/table7Non-detections: OB StarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSource number, [ESK2003] NotDetected NN in SimbadintRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainCountsSASource area countsctfloate_CountsSArms uncertainty on e_CountsSActfloatCountsBABackground area countsctfloate_CountsBArms uncertainty on e_CountsBActfloatCountsNet countsctfloate_Countsrms uncertainty on CountsctfloatRadRadiusarcminfloatSpTypeMK Spectral typecharlogLXUpper limit of X-ray luminositylog(1e-07W)float