Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000astl...26..225l&link_type=abstract
Astronomy Letters, vol. 26, p. 225-232 (2000)
Astronomy and Astrophysics
Astronomy
11
Scientific paper
The ultraviolet spectra of the star RU Lup obtained with the Hubble Space Telescope are analyzed. Emission lines are identified. The presence of absorption components with a nearly zero residual intensity in the MgII resonance doublet lines is indicative of mass outflow with a velocity V_infty = 300 km/s. These lines also exhibit a broad (1400 km/s at the base) component originating in the star itself. The profiles of the (optically thin) SiII and SiIII 1892 A lines for the first time unequivocally prove that these lines originate in an accretion shock wave rather than in the chromosphere, with the gas infall velocity being V_0 = 400 km/s. The intensity ratio of the CIV 1550 A and SiIV 1400 A resonance doublet components was found to be close to unity, suggesting a high accreted-gas density, lg N_0 > 12.5. Molecular H_2 Lyman lines formed in the stellar wind were detected. The HI L_alpha luminosity of RU Lup was found from their intensities to exceed 10% of L_bol. Radiation pressure in the L_alpha line on atomic hydrogen may play a significant role in the initial acceleration of stellar-wind matter, but the effect of L_alpha emission on the dynamics of molecular gas is negligible.
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