J/MNRAS/448/484ivo://CDS.VizieR/J/MNRAS/448/484doi:10.26093/cds/vizier.74480484CDSLopez-Martinez F.Gomez de Castro A.I.2024-08-14T20:20:38Z2015-12-04T15:20:58ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsultraviolet-astronomyspectroscopyThe atmospheric structure of T Tauri stars (TTSs) and its connection with the large-scale outflow is poorly known. Neither the effect of the magnetically mediated interaction between the star and the disc is well understood. The MgII multiplet is a fundamental tracer of TTSs atmospheres and outflows, and is the strongest feature in the near-ultraviolet spectrum of TTSs. The International Ultraviolet Explorer and Hubble Space Telescope data archives provide a unique set to study the main physical compounds contributing to the line profile and to derive the properties of the line formation region. The MgII profiles of 44 TTSs with resolution 13000-30000 are available in these archives. In this work, we use this data set to measure the main observables: flux, broadening, asymmetry, terminal velocity of the outflow, and the velocity of the discrete absorption components. For some few sources repeated observations are available and variability has been studied. There is a warm wind that at sub-au scales absorbs the blue wing of the MgII profiles. The main result found in this work is the correlation between the line broadening, MgII flux, terminal velocity of the flow and accretion rate. Both outflow and magnetospheric plasma contribute to the MgII flux. The flux-flux correlation between MgII and CIV or HeII is confirmed; however, no correlation is found between the MgII flux and the UV continuum or the H_2_ emission.2015MNRAS.448..484Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/448/484CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/448/484https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/448/484http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/448/484https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/448/484https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/448/484http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/448/484GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/448/484/table2 (Properties of the stars analysed in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/448/484/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/448/484/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/448/484/table2?GETtext/xml+votable180.050000true68.730933324.48143330.0055555555555555565/292 6/342 1048 1050 1073-1074 1081 1083 1111 1114-1115 1124 1159 14306 23549-23551 23704 23738 24201 24300 36956-36957 37012 38347 38363 38382 38687 41526 42429 42611 42704 47828https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/448/484?format=asciiUVdefaultJ/MNRAS/448/484/table2Properties of the stars analysed in this workAge? AgeMyrtime.agefloatnullablen_Age[a] Note on Age (1)meta.notecharr_incl? Reference for Inclination, in refs.dat filemeta.ref;pos.frameintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharn_Star[W] Note on Star (1)meta.notecharSpTypeMK spectral typesrc.spTypecharr_SpTypeReference for Spectral type, in refs.dat filemeta.ref;pos.frameintDist? Distancepcpos.distance;pos.heliocentricintnullableincl? Inclinationdegsrc.orbital.inclinationintnullableinclU? Upper value of inclination when intervalpcsrc.orbital.inclinationintnullableAV? Absorption in V bandmagphot.mag;em.opt.Vfloatnullabler_AV? Reference for Absorption, in refs.dat filemeta.ref;pos.frameintnullabledM/dt? Mass loss1e-08solMass.yr**-1phys.mass.lossfloatnullabler_dM/dt? Reference for Mass loss, in refs.dat filemeta.ref;pos.frameintnullablevsini? Rotational velocitykm/sphys.veloc.rotatfloatnullabler_vsini? Reference for vsini, in refs.dat filemeta.refintnullablelogTeff? Effective temperaturelog(K)phys.temperature.effectivefloatnullabler_logTeff? Reference for Effective temperature, in refs.dat filemeta.ref;pos.frameintnullablelogL? Luminositylog(solLum)phys.luminosityfloatnullabler_logL? Reference for Luminosity, in refs.dat filemeta.refintnullableMass? MasssolMassphys.massfloatnullablen_Mass[a] Note on Mass (1)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/448/484/table3MgII flux measurements corrected from extinction and velocity measurements of the analysed profilesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharObs.dateObservation datetime.epoch;obsnullableF2796Flux at 2796{AA} MgII line1e-15W.m**-2phot.flux;spect.linefloate_F2796rms uncertainty on F27961e-15W.m**-2stat.errorfloatF2804bFlux at 2804{AA} blue MgII line1e-15W.m**-2phot.flux;em.opt.B;spect.linefloate_F2804brms uncertainty on F2804b1e-15W.m**-2stat.errorfloatF2804rFlux at 2804{AA} red MgII line1e-15W.m**-2phot.flux;em.opt.R;spect.linefloate_F2804rrms uncertainty on F2804r1e-15W.m**-2stat.errorfloatVterm? Terminal velocitykm/sphys.velocfloatnullablen_Vterm[*] *: Terminal velocity can be measured accuratelymeta.notecharDAC? First discrete absorption components velocitykm/sspect.dopplerVelocfloatnullableDAC2? Second discrete absorption components velocitykm/sspect.dopplerVelocfloatnullableComCommentsmeta.notecharJ/MNRAS/448/484/table1Telescope/instrument details of the MgII observations of the stars in the sampleRResolving powerspect.resolutionintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarName of the starmeta.id;meta.maincharInstTelescope/Instrumentmeta.notecharObs.dateObservation Date (yy-mm-dd)time.epoch;obsnullableIDobsIdentification of the observationmeta.id;obscharExpTimeExposure timestime.duration;obs.exposuredoubleS/N? Signal to noise ratiostat.snrfloatnullablen_S/NNote on S/Nmeta.notecharJ/MNRAS/448/484/tablea1Telescope/instrument details for the Ly-alpha observations of the stars in the samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarName of the starmeta.id;meta.maincharInstTelescope/Instrumentmeta.notecharObs.dateObservation Date (yy-mm-dd)time.epoch;obsnullableIDobsIdentification of the observationmeta.id;obscharRResolving powerspect.resolutionintExpTimeExposure timestime.duration;obs.exposuredoubleS/N? Signal to noise ratiostat.snrfloatnullablen_S/NNote on S/Nmeta.notecharJ/MNRAS/448/484/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar