J/ApJ/784/127ivo://CDS.VizieR/J/ApJ/784/127doi:10.26093/cds/vizier.17840127CDSFrance K.Schindhelm E.Bergin E.A.Roueff E.Abgrall H.2017-07-19T07:32:14Z2017-06-19T15:19:25ZCDS support team

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

cds-question@unistra.fremission-line-starsspectroscopyultraviolet-astronomyearly-type-starsThe far-ultraviolet (FUV; 912-1700 {AA}) radiation field from accreting central stars in classical T Tauri systems influences the disk chemistry during the period of giant planet formation. The FUV field may also play a critical role in determining the evolution of the inner disk (r<10 AU), from a gas- and dust-rich primordial disk to a transitional system where the optically thick warm dust distribution has been depleted. Previous efforts to measure the true stellar+accretion-generated FUV luminosity (both hot gas emission lines and continua) have been complicated by a combination of low-sensitivity and/or low-spectral resolution and did not include the contribution from the bright Ly{alpha} emission line. In this work, we present a high-resolution spectroscopic study of the FUV radiation fields of 16 T Tauri stars whose dust disks display a range of evolutionary states. We include reconstructed Ly{alpha} line profiles and remove atomic and molecular disk emission (from H_2_ and CO fluorescence) to provide robust measurements of both the FUV continuum and hot gas lines (e.g., Ly{alpha}, N V, C IV, He II) for an appreciable sample of T Tauri stars for the first time. We find that the flux of the typical classical T Tauri star FUV radiation field at 1 AU from the central star is ~10^7^ times the average interstellar radiation field. The Ly{alpha} emission line contributes an average of 88% of the total FUV flux, with the FUV continuum accounting for an average of 8%. Both the FUV continuum and Ly{alpha} flux are strongly correlated with C IV flux, suggesting that accretion processes dominate the production of both of these components. On average, only ~0.5% of the total FUV flux is emitted between the Lyman limit (912 {AA}) and the H_2_(0-0) absorption band at 1110 {AA}. The total and component-level high-resolution radiation fields are made publicly available in machine-readable format.2014ApJ...784..127Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/784/127CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/297/391 : T Tauri stars ROSAT survey (Neuhaeuser+, 1995)J/ApJS/187/149 : StarCAT: STIS UV echelle spectra of stars (Ayres, 2010)J/ApJ/744/121 : Far-UV spectroscopy of T Tau stars (Yang+, 2012)J/ApJ/756/171 : HST far-UV survey of H2 emission of T Tau starshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/784/127https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/784/127http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/784/127https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/784/127https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/784/127http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/784/127GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/784/127/list (List of individual spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/784/127/list?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/784/127/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/784/127/list?GETtext/xml+votable180.050000true68.730933324.48143330.0055555555555555566/1029 1050 1074 1083 1114 1115 1171 23549 23551 24201 28746 37012 38382 42704https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/784/127?format=asciiUVdefaultJ/ApJ/784/127/listList of individual spectraspShow the spectrummeta.ref.urlcharNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeType of spectrummeta.noteFileNameName of the spectrum file in subdirectory spmeta.id;meta.filecharSimbadSimbad 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.main