J/A+A/359/227ivo://CDS.VizieR/J/A+A/359/227doi:10.26093/cds/vizier.33590227CDSHuelamo N.Neuhaeuser R.Stelzer B.Supper R.Zinnecker H.2017-12-15T10:55:51Z2008-04-13T09:30:47ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsapparent-magnitudeWe present a study of the X-ray emission from binary systems extracted from the Lindroos catalogue (Lindroos, 1986A&A...156..223L) based on the ROSAT All-Sky survey as well as ROSAT PSPC and HRI pointings. The studied sample consists of visual binary systems comprised of early-type primaries and late-type secondaries. The ages of the systems were determined by Lindroos (1985, Cat. II/127) from uvby{beta} photometry of the primaries. These ages range between 33 and 135Myr, so if the late-type secondaries are physically bound to the early-type primaries, they could be Post-T Tauri stars (PTTS). We have found strong X-ray emission from several secondaries. This fact together with their optical and IR data, make them bona fide PTTS candidates. We have also detected X-ray emission from several early-type primaries and, in particular, from most of the late-B type stars. Because their HRI hardness ratios are similar to those from resolved late-type stars, the presence of an unresolved late-type companion seems to be the cause of this emission.2000A&A...359..227Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/359/227CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2008)II/127 : Visual Double Stars with Early-Type Primaries. IV (Lindroos 1985)IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)IX/28 : ROSAT HRI Pointed Observations (1RXH) (ROSAT Team, 2000)IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/359/227https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/359/227http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/359/227https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/359/227https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/359/227http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/359/227GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/359/227/table1 (Stellar Data of the binary sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/359/227/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/359/227/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/359/227/table1?GETtext/xml+votable180.050000true2.509166711.14581390.005555555555555556Cone search capability for table J/A+A/359/227/table2 (RASS observations: Detections and upper limits)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/359/227/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/359/227/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/359/227/table2?GETtext/xml+votable180.050000true2.51137511.14719440.005555555555555556Cone search capability for table J/A+A/359/227/table3 (PSPC pointed observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/359/227/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/359/227/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/359/227/table3?GETtext/xml+votable180.050000true2.510333311.14477780.005555555555555556Cone search capability for table J/A+A/359/227/table4 (HRI observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/359/227/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/359/227/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/359/227/table4?GETtext/xml+votable180.050000true2.509958311.14444440.0055555555555555566/257 592 1069 2737 9133 10783 14854 18190 19567 20517 20786 21241 21434 21646 22862 22888 22893 23572 23779 25015 27306 27574 28896 36905 37254 37790 37816 37881 38719 38932 39193 39355 39833 41169 41171 42611 42617 42932 43011 43042 43062 43101 43211 43214 43238 43326 43333 43365 43677 47179https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/359/227?format=asciiOpticaldefaultJ/A+A/359/227/table5X-ray luminositiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. III/135) numbermeta.id;meta.mainintCompComponent designationmeta.code.multipcharl_logNHLimit flag on logNHmeta.code.errorcharlogNHComputed hydrogen column densitylog(cm**-2)phys.columnDensity;meta.modelledfloatr_logNH? Source of logNH (1)meta.ref;pos.frameintnullableObs[HRP] Type of observations (2)meta.notecharl_logLXLimit flag on logLXmeta.code.errorcharlogLXX-ray luminosity (3)log(1e-07W)phys.luminosity;em.X-rayfloate_logLX? rms uncertainty on logLXlog(1e-07W)stat.errorfloatnullablen_logLX[*] *: Mean X-ray luminosity computed from several observationsmeta.notecharl_logLX2Limit flag on logLX2meta.code.errorcharlogLX2? X-ray luminosity of the secondarylog(1e-07W)phys.luminosity;em.X-rayfloatnullableJ/A+A/359/227/table1Stellar Data of the binary samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_HDSimbad column added by the CDSmeta.ref.urlcharHDHD (Cat. III/135) numbermeta.id;meta.mainintprimarym_HD(A+BCX ) Multiplicity index on HDmeta.code.multipcharSpTypeMK spectral type (1)src.spTypecharRAJ2000Optical right ascension (J2000) (2)pos.eq.ra;meta.mainDEJ2000Optical declination (J2000) (2)pos.eq.dec;meta.mainSepSeparation angle (1)arcsecpos.distance;src.orbitalfloatDistDistance (3)pcpos.distance;pos.heliocentricfloatu_DistUncertainty flag on Distmeta.code.errorcharr_Dist[+] +: data from Lindroos, 1986A&A...156..223Lmeta.ref;pos.framechare_Dist? rms uncertainty on Distpcstat.errorfloatnullableu_e_DistUncertainty flag on e_Distmeta.code.errorcharVmagAV magnitude of the primarymagphot.mag;em.opt.Vfloatn_VmagA[*] Note on VmagA (4)meta.notecharVmagB? V magnitude of the secondarymagphot.mag;em.opt.Vfloatnullablen_VmagB[*7] Note on VmagB (4), (7)meta.notecharAV? Absorption in V bandmagphot.mag;em.opt.VfloatnullableClassClassification (6)src.classcharSimbadSimbad column added by the CDScharJ/A+A/359/227/table2RASS observations: Detections and upper limitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. III/135) numbermeta.id;meta.mainintRAJ2000? X-ray right ascension (J2000)pos.eq.ra;meta.mainnullableDEJ2000? X-ray declination sign (J2000)pos.eq.dec;meta.mainnullableDeltaA? Displacement between the detected X-ray source and the optical position of the primary component (1)arcsecpos.angDistancefloatnullableDeltaB? Displacement between the detected X-ray source and the optical position of the secondary component (1)arcsecpos.angDistancefloatnullablel_CountLimit flag on Countmeta.code.error;phot.countcharCountCount of the primary component or of the both is upper limit (2)ctphot.count;em.X-rayfloate_Count? rms uncertainty on Countsctstat.error;phot.countfloatnullableBcnt? Counts of the secondary componentctphot.count;em.X-rayfloatnullableExpTimeExposition timestime.duration;obs.exposurefloatl_HR1Limit flag on HR1meta.code.errorcharHR1? Hardness ratio 1 (G1)phot.flux;arith.ratiofloatnullablee_HR1? rms uncertainty on HR1stat.errorfloatnullablel_HR2Limit flag on HR2meta.code.errorcharHR2? Hardness ratio 2 (G1)phot.flux;arith.ratiofloatnullablee_HR2? rms uncertainty on HR2stat.errorfloatnullableML? Maximum likelihoodstat.likelihoodfloatnullableJ/A+A/359/227/table3PSPC pointed observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. III/135) numbermeta.id;meta.mainintn_HD[1/2]? Individual note (1)meta.noteintnullableRORROSAT Observation request numbermeta.id;obsintm_RORMultiplicity index on RORmeta.code.multipcharRAJ2000? X-ray right ascension (J2000)pos.eq.ra;meta.mainnullableDEJ2000? X-ray declination sign (J2000)pos.eq.dec;meta.mainnullableDeltaA? Displacement between the detected X-ray source and the optical position of the primary componentarcsecpos.angDistancefloatnullableDeltaB? Displacement between the detected X-ray source and the optical position of the secondary componentarcsecpos.angDistancefloatnullableOffaxis? Offaxisarcminpos.angDistancefloatnullablel_CountLimit flag on Countmeta.code.error;phot.countcharCountCount of the primary component or of the both is upper limit (2)ctphot.count;em.X-rayfloate_Count? rms uncertainty on Countsctstat.error;phot.countfloatnullableBcnt? Counts of the secondary componentctphot.count;em.X-rayfloatnullableExpTimeExposition timestime.duration;obs.exposurefloatHR1? Hardness ratio 1 (G1)phot.flux;arith.ratiofloatnullablee_HR1? rms uncertainty on HR1stat.errorfloatnullableHR2? Hardness ratio 2 (G1)phot.flux;arith.ratiofloatnullablee_HR2? rms uncertainty on HR2stat.errorfloatnullableML? Maximum likelihoodstat.likelihoodfloatnullableJ/A+A/359/227/table4HRI observationsn_HDNote on HD (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHD? HD (Cat. III/135) number)meta.id;meta.mainintnullableRORROSAT Observation request numbermeta.id;obsintm_RORMultiplicity index on RORmeta.code.multipcharn_CompNote on elongation (2)meta.notecharCompComposant designationmeta.code.multipcharRAJ2000? X-ray right ascension (J2000)pos.eq.ra;meta.mainnullableDEJ2000? X-ray declination (J2000)pos.eq.dec;meta.mainnullableDeltaA? Displacement between the detected X-ray source and the optical position of the binary system or of the primary component if DeltaB exist (3)arcsecpos.angDistancefloatnullableDeltaB? Displacement between the detected X-ray source and the optical position of the secondary component (3)arcsecpos.angDistancefloatnullableOffAxis? Displacement of the sources with respect to the axis of the telescopearcminfloatnullablel_CountLimit flag on Countmeta.code.error;phot.countcharCountTotal counts in the broad bandctphot.count;em.X-rayfloate_Count? rms uncertainty on Countsctstat.error;phot.countfloatnullableExpTimeExposition time (4)stime.duration;obs.exposurefloatl_HRLimit flag in HRmeta.code.errorcharHR? Hardness ratiophot.flux;arith.ratiofloatnullablee_HR? rms uncertainty on HRstat.errorfloatnullableML? Maximum of likelihood coefficientstat.likelihoodfloatnullableJ/A+A/359/227/table6HRI soft-band rate and UV-rate for detected early-type starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDHD (Cat. III/135) numbermeta.id;meta.mainintn_UmagNote on U-magnitudes (1)meta.notecharUmagU magnitude (from HR catalogue V/50)magphot.mag;em.opt.UfloatSrateS-band count rate (2)ct/ksphot.count;em.X-rayfloatUVrateUV count rate (2)ct/ksphot.count;em.UVfloatS/UVS to UV rates ratiophot.count;arith.ratiofloatlog(LX/Lbol)Bolometric to X-ray Luminosity ratiophys.luminosity;arith.ratiofloatJ/A+A/359/227/table7Stellar properties of the post-TTau (PTTS) candidatesHDHD (Cat. III/135) numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCompComponent designationmeta.code.multipcharu_Comp[?] Uncertainty flag on Compmeta.code.errorcharn_HD[t] Note on HD (1)meta.notecharSpTypeMK Spectral typesrc.spTypecharl_logLXLimit flag on logLXmeta.code.errorcharlogLXX-ray luminositylog(1e-07W)phys.luminosity;em.X-rayfloatl_EWLiLimit flag on EWLimeta.code.errorcharEWLiLi I absorption line equivalent width0.1nmspect.line.eqWidth;em.opt.Ifloate_EWLi? rms uncertainty on EWLi0.1nmstat.errorfloatnullablen_EWLi[1-3] Note on EWLi (2)meta.notecharF12um? 12{mu}m flux density (3)Jyphot.flux.density;em.IR.8-15umfloatnullableu_F12um[?] ?: unknown valuemeta.code.errorcharF100um? 100{mu}m flux density (3)Jyphot.flux.density;em.IR.60-100umfloatnullableu_F100um[?] ?: unknown valuemeta.code.errorcharf_RV[Ee :] Radial velocity comment (4)meta.codecharXray[+-] X-ray emission ? (5)meta.codecharLiI[+-] Li I equivalent width ? (5)meta.codecharIR-ex[+-?] Measured IR excess ? (5)meta.codecharRV[+-? ()] Measured radial velocity of pair ? (5)meta.codechar