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The Loopy Ultraviolet Line Profiles of RU Lupi: Accretion, Outflows, and Fluorescence
- Source :
- The Astronomical Journal. 129:2777-2791
- Publication Year :
- 2005
- Publisher :
- American Astronomical Society, 2005.
-
Abstract
- We present far-ultraviolet spectra of the classical T Tauri star RU Lupi covering the 912-1710 A spectral range, as observed by the HST/STIS and FUSE satellites. We use these spectra, which are rich in emission and absorption lines, to probe both the accreting and outflowing gas. Absorption in the Ly-alpha profile constrains the extinction to A_V=0.07 mag, which we confirm with other diagnostics. We estimate a mass accretion rate of (5\pm2)\times10^{-8}$ M_\odot/yr using the optical-NUV accretion continuum. The accreting gas is also detected in bright, broad lines of C IV, Si IV, and N V, which all show complex structures across the line profile. Many other emission lines, including those of H_2 and Fe II, are pumped by Ly-alpha. RU Lupi's spectrum varies significantly in the FUV; our STIS observations occurred when RU Lupi was brighter than several other observations in the FUV, possibly due to a high mass accretion rate.
- Subjects :
- Physics
Absorption spectroscopy
Astrophysics::High Energy Astrophysical Phenomena
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Fluorescence
Accretion (astrophysics)
Spectral line
T Tauri star
Accretion rate
Space and Planetary Science
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
Emission spectrum
Astrophysics::Galaxy Astrophysics
Subjects
Details
- ISSN :
- 15383881 and 00046256
- Volume :
- 129
- Database :
- OpenAIRE
- Journal :
- The Astronomical Journal
- Accession number :
- edsair.doi...........2560186be3a817bc3ca99dc4eeae3705