J/A+A/297/391ivo://CDS.VizieR/J/A+A/297/391doi:10.26093/cds/vizier.32970391CDSNeuhaeuser R.Sterzik M.F.Schmitt J.H.M.M.Wichmann R.Krautter J.1999-07-29T16:22:00Z1999-07-29T16:21:00ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsx-ray-sourcesWe study the X-ray emission of T Tauri stars (TTS) in Taurus-Auriga as observed with the spatially unbiased flux-limited ROSAT All-Sky Survey.1995A&A...297..391Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/297/391CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/73 : Emission-line stars in Orion population (Herbig+ 1988)J/A+A/312/439 : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996)J/A+AS/132/173 : New weak-line T Tauri stars in Taurus-Auriga (Li+ 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/297/391https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/297/391http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/297/391https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/297/391https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/297/391http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/297/391GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/297/391/table1 (Sample of T Tauri stars (TTS) studied)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/297/391/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/297/391/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/297/391/table1?GETtext/xml+votable180.050000true52.4087524.5112220.005555555555555556Cone search capability for table J/A+A/297/391/table2 (ROSAT ALL Sky Survey (RASS) data for TTS above RASS detection limit)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/297/391/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/297/391/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/297/391/table2?GETtext/xml+votable180.050000true52.41333324.5143330.005555555555555556ROSAThttps://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/297/391?format=asciiX-raydefaultJ/A+A/297/391/table1Sample of T Tauri stars (TTS) studiedNameNamemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_Name[abc] Note on name (1)meta.notecharHBC[]? HBC number <V/73> (Herbig & Bell 1988)meta.idintnullableTypeType of the star (2)src.classcharr_NameReferences (detailed in refs.dat)meta.refcharRAJ2000Right ascension J2000.0 (optical position)pos.eq.ra;meta.mainDEJ2000Declination J2000.0 (optical position)pos.eq.dec;meta.mainr_pmReferences regarding proper motionmeta.refcharr_RV[]? References regarding radial velocitymeta.refintnullableRASS[]? Maximum likelihood for existence for RASS detected objectsstat.fit.paramintnullableu_RASScolon indicates source confusionmeta.code.errorcharn_RASS'ul' for RASS non-detectionsmeta.notecharJ/A+A/297/391/table2ROSAT ALL Sky Survey (RASS) data for TTS above RASS detection limitrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharRAJ2000Right ascension J2000.0 (X-ray position)pos.eq.ra;meta.mainDEJ2000Declination J2000.0 (X-ray position)pos.eq.dec;meta.mainDistDistance between X-ray and optical positionsarcsecpos.angDistancefloatn_Dist[:] A colon indicates X-ray sources that appear to be extendedmeta.notecharHR1[-1/1] Hardness ratio 1 (1)phot.flux;arith.ratiofloate_HR1rms uncertainty on HR1stat.errorfloatHR2[-1/1] Hardness ratio 2 (1)phot.flux;arith.ratiofloate_HR2rms uncertainty on HR2stat.errorfloatXcountBackground subtracted X-ray counts (for multiples and source confusion cases, we list the combined number of counts).ctphot.count;em.X-rayfloate_Xcountrms uncertainty on Xcountctstat.errorfloatExpRASS exposition timestime.duration;obs.exposureintJ/A+A/297/391/table4Upper limits for TTS below RASS limitNameName (1)meta.id;meta.maincharDistOffset of initial positionarcsecpos.angDistancefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintProbaProbability of existence%stat.fit.goodnessfloatl_Xcount[<=] limit flag on Xcountmeta.code.errorcharXcountUpper limit for the number of X-ray countsctphot.count;em.X-rayfloatExpExposure timestime.duration;obs.exposureint1/ECFEnergy conversion factor (10-11/ECF) (2)10000J.count**-1.cm**-2arith.factorfloatn_1/ECF[:] ':' average 1/ECF (2)meta.notecharl_Lx[<=>] limit flag on Lxmeta.code.errorcharLxUpper limit for X-ray luminosity (Lx/10+30)1e+23Wphys.luminosity;em.X-rayfloatl_Fs[<=] limit flag on Fsmeta.code.errorcharFs[]? Upper limit for X-ray surface flux (Fs/10+7)10000W.m**-2phot.flux;em.X-rayfloatnullableJ/A+A/297/391/table5Statistical significance for correlationsUnitSample unitmeta.unitcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTestCorrelation testedmeta.id;meta.maincharn_Test[*] Note on Test (1)meta.notecharPropTest propertymeta.notechardetNumber of pairs tested with detectionsmeta.numberintulUpper limits detectioninstr.sensitivityintPrCoxProbability for the null hypothesis that the correlation tested is not present according to Cox's proportional hazard model%stat.fit.goodnessfloatPrKenProbability for the null hypothesis that the correlation tested is not present according to the Generalized Kendall's {tau} test%stat.fit.goodnessfloatPrSpeProbability for the null hypothesis that the correlation tested is not present according to the Spearman's {rho} test%stat.fit.goodnessfloatSlope[]? Slope resulting from a linear regression for correlations acceptedstat.fit.paramfloatnullablee_Slope[]? rms uncertainty on Slopestat.errorfloatnullableJ/A+A/297/391/table6Statistical significance for classical T Tauri stars (CTTS) and weak-line T Tauri stars (WTTS) being differentWTTSmdWTTS mediansrc.sample;stat.mediandoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTestTest item propertymeta.notecharn_TestNote on Test (1)meta.notecharunitTest item unitmeta.unitcharCTTSsClassical T Tauri stars (CTTS) sample sizemeta.numberintCTTSsul[]? Upper limits of the CTTS sample sizemeta.numberintnullableCTTSmnCTTS meansrc.sample;stat.meandoublee_CTTSmnrms uncertainty on CTTS meanstat.errorfloatCTTSmd[]? CTTS medianmeta.numberdoublenullableWTTSsWeak-line T Tauri stars (WTTS) sample sizemeta.numberintWTTSsul[]? Upper limits of the WTTS sample sizemeta.numberintnullableWTTSmnWTTS meansrc.sample;stat.meandoublee_WTTSmnrms uncertainty on WTTS meanstat.errorfloatPrGWpeProbability for the null hypothesis that CTTS and WTTS distributions are similar according to Gehan's generalized Wilcoxon test for permutation variance%stat.fit.goodnessfloatPrGWhyProbability for the null hypothesis that CTTS and WTTS distributions are similar according to Gehan's generalized Wilcoxon test for hypergeometric variance%stat.fit.goodnessfloatPrLogRankProbability for the null hypothesis that CTTS and WTTS distributions are similar according to the logrank test (c.f. Sec. 5.1.)stat.fit.goodnessfloatJ/A+A/297/391/tablea1Non-X-ray data for TTS studiedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharEWHaHalpha equivalent width0.1nmspect.line.eqWidthcharr_EWHaReference for Halpha equivalent widthmeta.refcharl_vsinilimit flag on vsinimeta.code.errorcharvsini[]? Projected surface velocitykm/sphys.veloc.rotatintnullableP[]? Rotation perioddtime.periodfloatnullabler_PReferences for P and vsini (1)meta.refcharL[]? Stellar bolometric luminositysolLumphys.luminosityfloatnullabler_L[]? References for the luminosity Lmeta.refintnullableMass[]? Stellar masssolMassphys.massfloatnullableu_Massuncertainty flag on Mmeta.code.errorcharr_Mass[]? References for the mass Mmeta.refintnullablel_log(t)limit flag on agemeta.code.errorcharlog(t)[]? Stellar agelog(yr)time.agefloatnullableu_log(t)uncertainty flag on agemeta.code.errorcharr_log(t)[]? References for the age tmeta.refintnullablelog(Teff)[]? Effective temperaturelog(K)phys.temperature.effectivefloatnullabler_log(Teff)[]? References for Teffmeta.refintnullableAv[]? Visual extinctionmagphys.absorptionfloatnullabler_Av[]? References for the extinction Avmeta.refintnullableJ/A+A/297/391/refsReferences quoted in table1 and tablea1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefNumReference numbermeta.refintTextText of reference, including the bibcodemeta.bib.bibcodecharJ/A+A/297/391/table3Spectral fit results for detected TTSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharlogN(H)Foreground hydrogen column densitylog(cm**-2)phys.columnDensityfloatu_logN(H)':' indicates cases, where fixed absorption did not yield good fits (see text in Sec. 3 for details)meta.code.errorchare(logN(H))u[]? Error in absorption (upper interval) (1)stat.errorfloatnullablee(logN(H))l[]? Error in absorption (lower interval) (1)stat.errorfloatnullablek.TxX-ray emission energykeVem.energyfloate(k.Tx)uError in k.Tx (upper interval)keVstat.errorfloate(k.Tx)lError in k.Tx (lower interval)keVstat.errorfloat1/ECFEnergy conversion factor (10-11/ECF)10000J.count**-1.cm**-2arith.factorfloate(1/ECF)uError in ECF (upper interval)10000J.count**-1.cm**-2stat.errorfloate(1/ECF)lError in ECF (lower interval)10000J.count**-1.cm**-2stat.errorfloatLxIndividually corrected X-ray luminosity (Lx/10+30) (2)1e+23Wphys.luminosity;em.X-rayfloate(Lx)uError in Lx (upper interval)1e+23Wphys.luminosity;em.X-rayfloate(Lx)lError in Lx (lower interval)1e+23Wphys.luminosity;em.X-rayfloatFs[]? X-ray surface flux (Fs/10+7) (2)10000W.m**-2phot.flux;em.X-rayfloatnullablee(Fs)u[]? Error in Fs (upper interval)10000W.m**-2stat.errorfloatnullablee(Fs)l[]? Error in Fs (lower interval)10000W.m**-2stat.errorfloatnullable