J/A+AS/123/329ivo://CDS.VizieR/J/A+AS/123/329CDSKrautter J.Wichmann R.Schmitt J.H.M.M.Alcala J.M.Neuhaeuser R.,Terranegra L.2017-06-26T11:49:37Z1999-02-27T12:26:46ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsx-ray-sourcesWe present first results obtained by a survey of the Lupus star forming region in search of new T Tauri stars. This study has been performed on the basis of deep pointed ROSAT observations in the Lupus dark clouds as well as data from the ROSAT All-Sky-Survey in the surrounding, less obscured regions. Our survey covers an area of about 230 square degrees, located between 15^h^6^m^ and 16^h^24^m^ in right ascension and between -47{deg} and -32{deg} in declination. Identification of ROSAT All-Sky-Survey sources in this area by means of optical spectroscopy revealed 89 T Tauri stars, 86 of them "weak-line" T Tauri stars (WTTS not known from previous studies of this region. Our pointed ROSAT observations led to the identification of 47 more T Tauri stars, giving a total of 136 new T Tauri stars. The large area of our study, as compared with previous works, allows us to study the spatial distribution of WTTS in this star forming region on alarge scale. We find the new WTTS to be distributed over the whole area of our survey, indicating that their spatial distribution might extend well beyond our study area. Contrary to the Lupus T Tauri stars known prior to this study, the WTTS discovered by the ROSAT All-Sky-Survey are not clustered in the regions of highest extinction, i.e. the dark clouds.1997A&AS..123..329Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+AS/123/329CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1996)IX/11 : ROSAT Source Catalog (Voges+ 1994)J/A+A/320/185 : T Tauri UBVRIcJHKL photometry (Wichmann+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+AS/123/329https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+AS/123/329http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+AS/123/329https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+AS/123/329https://vizier.iucaa.in/viz-bin/votable?-source=J/A+AS/123/329http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+AS/123/329GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+AS/123/329/table6 (New Non-TTS emission-line objects in Lupus)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/123/329/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/123/329/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/123/329/table6?GETtext/xml+votable180.050000true227.1002083-34.66663890.005555555555555556Cone search capability for table J/A+AS/123/329/Xpointed (Sources in pointed observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/123/329/Xpointed?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/123/329/Xpointed?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/123/329/Xpointed?GETtext/xml+votable180.050000true234.2769167-34.15380560.005555555555555556Cone search capability for table J/A+AS/123/329/newTTau (New T Tauri stars in Lupus, and their spectral fit result)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/123/329/newTTau?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/123/329/newTTau?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/123/329/newTTau?GETtext/xml+votable180.050000true226.487-43.20056110.005555555555555556Cone search capability for table J/A+AS/123/329/table10 (X-ray data for new T Tauri stars in Lupus)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+AS/123/329/table10?https://vizier.iucaa.in/viz-bin/conesearch/J/A+AS/123/329/table10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+AS/123/329/table10?GETtext/xml+votable180.050000true226.4882083-43.19972220.005555555555555556ROSAT5/10638 10653-10654 10663 10671 10676 10678 10684 6/41949 41972-41973 42525 42541-42542 42557 42559 42565 42569 42571 42576 42578 42580 42587-42590 42599 42604 42609-42611 42620 42628 42630 42634-42635 42640 42642 42645-42646 42658 42662-42664 42672 42675 42678-42679 42683 42689-42693 42695-42696 42699-42700 42703 42708 42719 42725 42727-42730 42733 42735 42741 42760 42791 42885 42888-42889 42891 42912 44050-44051 44059 44061-44063 44104 44108https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+AS/123/329?format=asciiX-raydefaultJ/A+AS/123/329/table6New Non-TTS emission-line objects in LupusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNoSequential numbermeta.idintStarIdentifier of starmeta.id;meta.maincharNA[1/3]? Note on X-ray discovery (1)meta.noteintnullableRAJ2000Right Ascension for equinox J2000.0 (2)pos.eq.ra;meta.mainDEJ2000Declination for equinox J2000.0 (2)pos.eq.dec;meta.mainCTS? ROSAT X-Ray count rate (3)ct/sphot.count;em.X-rayfloatnullablee_CTS? Error of ROSAT X-Ray count ratect/sstat.errorfloatnullableSpTSpectral typesrc.spTypecharEWHaEquivalent width for H{alpha}0.1nmspect.line.eqWidthfloatVmag? V magnitude (4)magphot.mag;em.opt.VfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+AS/123/329/XpointedSources in pointed observationsHR2ROSAT hardness ratio 2phot.flux;arith.ratiofloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNoSequential numbermeta.idintStarIdentifier of X-ray sourcemeta.id;meta.maincharNSNote on X-ray discovery (1)meta.notecharNARegion in Lupus: 1 (table7), 2 (table8) or 3 (table9)meta.notecharRAJ2000Right Ascension for equinox J2000.0 (2)pos.eq.ra;meta.mainDEJ2000Declination for equinox J2000.0 (2)pos.eq.dec;meta.mainMLLikelihood of existencestat.likelihoodfloatt.expExposure timestime.duration;obs.exposurefloatCTSROSAT X-Ray count rate (3)ct/sphot.count;em.X-rayfloate_CTSError of ROSAT X-Ray count ratect/sstat.errorfloatHR1ROSAT hardness ratio 1phot.flux;arith.ratiofloate_HR1Error of ROSAT hardness ratio 1stat.errorfloate_HR2Error of ROSAT hardness ratio 2stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+AS/123/329/newTTauNew T Tauri stars in Lupus, and their spectral fit resultrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTTauNoSequential numbermeta.idintStarIdentifier of starmeta.id;meta.maincharNA[1/3]? Note on X-ray discovery (1)meta.noteintnullableRAJ2000Right Ascension for equinox J2000.0 (2)pos.eq.ra;meta.mainDEJ2000Declination for equinox J2000.0 (2)pos.eq.dec;meta.mainEWHaEquivalent width for H{alpha}0.1nmspect.line.eqWidthfloatSpTSpectral typesrc.spTypecharVmag? V magnitude (3)magphot.mag;em.opt.VfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharAV? Extinction A(V) from photometry (3)magphys.absorptionfloatnullablelog(NH)? Absorbing HI column density (4)log(cm**-2)phys.columnDensityfloatnullablekTX? Temperature of X-ray emitting plasma (5)keVphys.temperaturefloatnullableE_kTX? 1 {sigma} upper error bar of kTXkeVstat.error;stat.maxfloatnullablee_kTX? 1 {sigma} lower error bar of kTXkeVstat.errorfloatnullablelog(NH)f? Fitted absorbing HI column density (5)log(cm**-2)phys.columnDensityfloatnullableE_log(NH)f? 1 {sigma} upper error bar of log(NH)flog(cm**-2)stat.error;stat.maxfloatnullablee_log(NH)f? 1 {sigma} lower error bar of log(NH)flog(cm**-2)stat.errorfloatnullableLX? X-ray luminosity (LX/10^30^erg/s)1e+23Wphys.luminosity;em.X-rayfloatnullableE_LX? 1 {sigma} upper error bar of LX1e+23Wstat.error;stat.maxfloatnullablee_LX? 1 {sigma} lower error bar of LX1e+23Wstat.errorfloatnullableJ/A+AS/123/329/table10X-ray data for new T Tauri stars in LupusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarIdentifier of X-ray source (1)meta.id;meta.maincharNA[1/3]? Note on X-ray discovery (2)meta.noteintnullableRAJ2000Right Ascension for equinox J2000.0 (3)pos.eq.ra;meta.mainDEJ2000Declination for equinox J2000.0 (3)pos.eq.dec;meta.mainMLLikelihood of existencestat.likelihoodfloatt.expExposure timestime.duration;obs.exposuredoubleCTSROSAT X-Ray count rate (4)ct/sphot.count;em.X-rayfloate_CTSError of ROSAT X-Ray count ratect/sstat.errorfloatHR1ROSAT hardness ratio 1phot.flux;arith.ratiofloate_HR1Error of ROSAT hardness ratio 1stat.errorfloatHR2ROSAT hardness ratio 2phot.flux;arith.ratiofloate_HR2Error of ROSAT hardness ratio 2stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+AS/123/329/table12X-ray data from pointed observations and spectral fit results for T Tauri stars in Lupus known prior to our studyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSchwartzIdentifier of star from Schwartz (Sz NNN) (1977ApJS...35..161S)meta.id;meta.maincharCTSROSAT X-Ray count rate (1)ct/sphot.count;em.X-raydoublee_CTS? Error of ROSAT X-Ray count rate (1)ct/sstat.errordoublenullableHR1? ROSAT hardness ratio 1phot.flux;arith.ratiofloatnullablee_HR1? Error of ROSAT hardness ratio 1stat.errorfloatnullableHR2? ROSAT hardness ratio 2phot.flux;arith.ratiofloatnullablee_HR2? Error of ROSAT hardness ratio 2stat.errorfloatnullableAVExtinction A(V) (2)magphys.absorptionfloatlog(NH)Absorbing HI column density (3)log(cm**-2)phys.columnDensityfloatE_log(NH)? 1 {sigma} upper error bar of log(NH)log(cm**-2)stat.error;stat.maxfloatnullablee_log(NH)? 1 {sigma} lower error bar of log(NH)log(cm**-2)stat.errorfloatnullablekTX? Temperature of X-ray emitting plasma (3)keVphys.temperaturefloatnullableE_kTX? 1 {sigma} upper error bar of kTXkeVstat.error;stat.maxfloatnullablee_kTX? 1 {sigma} lower error bar of kTXkeVstat.errorfloatnullableLXX-ray luminosity (LX/10^30) (3)1e-07Wphys.luminosity;em.X-rayfloatE_LX? 1 {sigma} upper error bar of LX1e-07Wstat.error;stat.maxfloatnullablee_LX? 1 {sigma} lower error bar of LX1e-07Wstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar