Atmospheric properties of RU LUPI derived from high- and low-resolution IUE spectra

Astronomy and Astrophysics – Astronomy

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Atmospheric Models, Iue, Resonance Lines, Spectral Resolution, Stellar Winds, T Tauri Stars, Ultraviolet Spectra, Variable Stars, Dispersions, Taurus Constellation, Ultraviolet Astronomy, Ultraviolet Photography

Scientific paper

High and low-dispersion IUE spectra of the premain sequence star, RU Lupi, were obtained using both the short wave prime (SWP) and long wave redundant (LWR) cameras. Strong P Cygni line profiles are seen in Mg II and Fe II emission lines, indicating that the lines are formed in the stellar wind of RU Lupi. An increase in transition region line widths is seen with increasing temperature, which cannot be due solely to opacity broadening, thus indicating that kinematic broadening mechanisms are dominant. The transition region density is approx. 3 x 10 to the 10th power cubic cm derived from the Si III lambda1892/C III lambda1909 line ratio. The status of the atmospheric modeling of RU Lupi is discussed.

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