Magnetic structure in cool stars. XVIII - UV-line emissions from T Tauri stars

Astronomy and Astrophysics – Astrophysics

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Cool Stars, Stellar Magnetic Fields, Stellar Spectra, T Tauri Stars, Accretion Disks, Chromosphere, Emission Spectra, Flux Density, Stellar Atmospheres, Ultraviolet Spectra

Scientific paper

The flux densities in the UV spectral emission lines from T Tauri stars are compared with those from other cool stars. In the flux-flux diagrams for pairs of UV emission lines the data points for T Tauri stars extend the relations as defined by main-sequence and evolved stars towards larger flux densities by a factor of 40. We discuss the large emission-line flux densities and the relations between flux densities from different lines in the light of magnetic activity and recent models of accretion disks in T Tauri stars. The very large emission fluxes in chromospheric lines may be explained by a large emitting volume associated with the warm (about 10,000 K) inner disk boundary layer, but the fluxes and the line broadening in the high-excitation lines requires the presence of hotter material, with temperatures of about 200,000 K, which must be attached to the inner disks but which is not predicted by existing disk models.

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