Near-simultaneous ultraviolet and optical spectrophotometry of T Tauri stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Chromosphere, Continuous Spectra, Stellar Spectrophotometry, T Tauri Stars, Ultraviolet Spectra, Spectral Energy Distribution, Stellar Color, Ubv Spectra

Scientific paper

A set of near-simultaneous ultraviolet and optical spectra and UBVR(J)I(J) photometry of five T Tauri stars has been analyzed for the shape of the energy distribution shortward of 3000 A. The far-ultraviolet continua of these stars are very much stronger than the level of light scattered from longer wavelengths in the IUE spectrograph. The results, expressed as two-color plots, show that the UV colors of T Tauri stars differ significantly from those expected from their optical spectral types. Although these particular K-type T Tauri stars are not extreme members of the class, they have the UV colors of A stars. The spectral shape of this UV excess is approximately that expected from published chromospheric models of T Tauri stars.

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