J/ApJ/697/1695ivo://CDS.VizieR/J/ApJ/697/1695doi:10.26093/cds/vizier.16971695CDSAntoniou V.Zezas A.Hatzidimitriou D.McDowell J.C.2017-10-09T13:33:35Z2011-06-21T10:08:25ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsx-ray-binary-starsbe-starsWe present the most likely optical counterparts of 113 X-ray sources detected in our Chandra survey of the central region of the Small Magellanic Cloud (SMC) based on the OGLE-II and Magellanic Clouds Photometric Survey catalogs. We estimate that the foreground contamination and chance coincidence probability are minimal for the bright optical counterparts (corresponding to OB type stars; 35 in total). We propose here for the first time 13 high-mass X-ray binaries, of which four are Be/X-ray binaries (Be-XRBs), and we confirm the previous classification of 18 Be-XRBs. We estimate that the new candidate Be-XRBs have an age of ~15-85Myr, consistent with the age of Be stars.2009ApJ...697.1695Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/697/1695CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/315 : UCAC3 Catalogue (Zacharias+ 2009)B/denis : The DENIS database (DENIS Consortium, 2005)VII/234 : DENIS catalog of galaxies (Paturel+, 2003)I/284 : The USNO-B1.0 Catalog (Monet+ 2003)II/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)I/271 : The Guide Star Catalog, Version 2.2 (GSC2.2) (STScI, 2001)II/228 : DENIS Catalogue toward Magellanic Clouds (DCMC) (Cioni+ 2000)I/221 : The Magellanic Catalogue of Stars - MACS (Tucholke+ 1996)J/MNRAS/388/1198 : Be/X-ray binaries in Small Magellanic Cloud (McBride+, 2008)J/AcA/54/1 : OGLE II SMC eclipsing binaries (Wyrzykowski+, 2004)J/MNRAS/353/705 : OGLE Variables in Magellanic Clouds (Ita+, 2004)J/AJ/127/1632 : UBVR(UIT) photometry of O and OB stars in SMC (Oey+, 2004)J/MNRAS/353/601 : 2dF survey of the Small Magellanic Cloud (Evans+, 2004)J/PASJ/55/161 : ASCA sources in the SMC (Yokogawa+, 2003)J/AcA/48/147 : OGLE SMC BVI photometry (Udalski+ 1998)J/AcA/48/563 : Photometry of OGLE SMC eclipsing binaries (Udalski+, 1998)J/AcA/51/317 : OGLE DIA. Catalog of LMC and SMC images (Zebrun+, 2001)J/A+AS/147/75 : ROSAT HRI catalogue of SMC X-ray sources (Sasaki+, 2000)J/A+AS/142/41 : SMC X-ray sources ROSAT PSPC catalogue (Haberl+, 2000)J/MNRAS/311/741 : SMC emission-line objects (Murphy+, 2000)J/ApJS/101/41 : SMC and Bridge extended catalog (Bica+ 1995)J/A+AS/102/451 : Emission-line stars and PNe in the SMC (Meyssonnier+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/697/1695https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/697/1695http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/697/1695https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/697/1695https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/697/1695http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/697/1695GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/697/1695/table2 (Optical counterparts of X-ray sources in Chandra fields 3-7)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/697/1695/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/697/1695/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/697/1695/table2?GETtext/xml+votable180.050000true14.3325-72.42611110.0055555555555555566/33295 33317https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/697/1695?format=asciiOpticaldefaultJ/ApJ/697/1695/table2Optical counterparts of X-ray sources in Chandra fields 3-7f_OSrcFlag on OSrc (2)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_XSrcSimbad column added by the CDSmeta.ref.urlcharXSrcX-ray source identification (G1)meta.id;meta.maincharprimaryf_XSrc[*dfc ] Flag on Src (1)meta.codecharXRadSearch radiusarcsecstat.fit.paramfloatOSrcOptical counterpart source identification (G2)meta.id.crosscharOff? Optical/X-ray positional offsetarcsecpos;arith.difffloatnullableVmag? The V band magnitude (3)magphot.mag;em.opt.Vfloatnullablee_Vmag? Error in Vmag (3)magstat.error;phot.mag;em.opt.VfloatnullableB-V? The (B-V) color index (3)magphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? Error in B-V (3)magstat.error;phot.color;em.opt.BfloatnullableU-B? The (U-B) color index (3)magphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? Error in U-B color (3)magstat.error;phot.color;em.opt.UfloatnullableNoteAdditonal notes (4)meta.notecharRAJ2000? Hour of Right Ascension of optical source (J2000)pos.eq.ra;meta.mainnullableDEJ2000? Degree of Declination of optical sourcepos.eq.dec;meta.mainnullableJ/ApJ/697/1695/table4Additional optical inforecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXSrcX-ray source identification (G1)meta.id;meta.maincharTypeSource type (1)src.classcharr_TypeReference(s) for Type (see refs.dat file)meta.notecharOSrcOptical source identification (G2)meta.id.crosscharr_OSrcReference(s) for OSrc (see refs.dat file)meta.ref;pos.framecharOtherOther sources within 1.5"meta.notecharr_OtherReference(s) for Other (see refs.dat file)meta.ref;pos.framecharJ/ApJ/697/1695/table7Summary of optical and X-ray properties for bright sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXSrcX-ray source identification (G1)meta.id;meta.maincharOSrcOptical counterpart source identification (G2)meta.id.crosscharf_OSrc[dfs] Flag on OSrc (1)meta.codecharOSrc2Optical counterpart source identification (G2)meta.id.crosscharr_OSrc2? Reference for OSrc2meta.ref;pos.framecharVmagV-band magnitudemagphot.mag;em.opt.Vfloate_VmagError in Vmagmagstat.error;phot.mag;em.opt.VfloatB-V? The (B-V) color indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? Error in B-Vmagstat.error;phot.color;em.opt.BfloatnullableU-B? The (U-B) color indexmagphot.color;em.opt.U;em.opt.Bfloatnullablee_U-B? Error in U-B color indexmagstat.error;phot.color;em.opt.UfloatnullableOff? Optical/X-ray positional offsetarcsecpos;arith.difffloatnullableSpecSpectrum band (2)instr.bandpasscharSXPX-ray pulsar identification (3)meta.idcharr_SXP? Reference for SXPmeta.ref;pos.framecharFlux? Absorbed flux in the 2.0-10.0keV energy band calculated from net counts (expressed in 10^-14^erg/cm^2^/s)aW.m**-2phot.flux;em.X-rayfloatnullableE_Flux? Positive error on FluxaW.m**-2stat.error;stat.maxfloatnullablee_Flux? Negative error on FluxaW.m**-2stat.error;phot.fluxfloatnullablexi? X-ray to optical "color index", {xi} (4)phot.colorfloatnullableE_xi? Positive error on xistat.error;stat.maxfloatnullablee_xi? Negative error on xistat.errorfloatnullable[MA93]? Identified from the catalog of Meyssonnier & Azzopardi (1993, Cat. J/A+AS/102/451)meta.id.crossintnullableu_[MA93]Uncertainty flag for [MA93]meta.code.errorcharSep? Offset for [MA93]arcsecpos;arith.difffloatnullableClassThis work object classification (5)meta.code.class;src.classcharf_Class[h] confirmed Class (6)meta.codecharClasspPrevious classificationsrc.classcharf_Classp[eg] Flag on Classp (6)meta.codecharJ/ApJ/697/1695/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharNoteCatalog reference in VizieRmeta.notecharJ/ApJ/697/1695/notesNotes on individual sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintXSrcX-ray source identification (G1)meta.id;meta.maincharNoteText of notemeta.notechar