Abstract
Abstract HST/GHRS spectra of 5 classical T Tau stars (CTTSs) in the 1150–2800 spectral band were analyzed in detail for the first time. Profiles of optically thin Si III] 1892 and C III] 1909 lines in RU Lup and RY Tau spectra are asymmetric and have FWHM > 100 km s−1 which definitely excludes their origin in chromospheric regions. It appeared possible to reproduce observed profiles in the framework of an accretion shock model. A flare-like event was detected in the case of RY Tau accompanied with a redshift of CIV 1550 and He II 1640 line profiles. A number of strong lines of molecular hydrogen were found: they originated in CTTS circumstellar envelopes and L α quanta pumped by accretion shock. CTTSs L α luminosity can reach 10% of the observed bolometric luminosity. It is shown that Fe II absorption lines originating in CTTS stellar wind along with H2 emission lines can significantly disturb profiles of C IV 1550 and Si IV 1400 lines. We also found Fe II fluorescent emission lines in RW Aur and BP Tau s...
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