NDLI: Analysis of HST ultraviolet spectra for T Tauri stars: RU Lup

Content Provider	Springer Nature Link
Author	Lamzin, S. A.
Copyright Year	2000
Abstract	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 Mg II resonance doublet lines is indicative of mass outflow with a velocity V $_{∞}$≃300 km s$^{−1}$. These lines also exhibit a broad (≃1400 km s$^{−1}$ at the base) component originating in the star itself. The profiles of the (optically thin) Si II] and Si III]1892 Å 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$^{−1}$. The intensity ratio of the C IV 1550 Å and Si IV 1400 Å resonance doublet components was found to be close to unity, suggesting a high accreted-gas density, logN $_{0}$>12.5. Molecular H$_{2}$ Lyman lines formed in the stellar wind were detected. The H I Lα luminosity of RU Lup was found from their intensities to exceed 10% of L $_{bol}$. Radiation pressure in the Lα line on atomic hydrogen may play a significant role in the initial acceleration of stellar-wind matter, but the effect of Lα emission on the dynamics of molecular gas is negligible.
Starting Page	225
Ending Page	232
Page Count	8
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	26
Issue Number	4
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2000-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	stars—variable and peculiar T Tau stars Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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