UV spectra of classical T Tauri stars Virtual Observatory Resource

Authors
  1. France K.
  2. Schindhelm E.
  3. Bergin E.A.
  4. Roueff E.
  5. Abgrall H.
  6. Published by
    CDS
Abstract

The 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.

Keywords
  1. emission-line-stars
  2. spectroscopy
  3. ultraviolet-astronomy
  4. early-type-stars
Bibliographic source Bibcode
2014ApJ...784..127F
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/784/127
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/784/127
Document Object Identifer DOI
doi:10.26093/cds/vizier.17840127

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/784/127
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/784/127
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/784/127
IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
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?

History

2017-06-19T15:19:25Z
Resource record created
2017-06-19T15:19:25Z
Created
2017-07-19T07:32:14Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr