| Issue |
A&A
Volume 391, Number 2, August IV 2002
|
|
|---|---|---|
| Page(s) | 595 - 608 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20020814 | |
| Published online | 02 August 2002 | |
Spectroscopy of T Tauri stars with UVES*
Observations and analysis of RU Lup
Department of Astronomy and Space Physics Box 515, 751 20 Uppsala, Sweden
Corresponding author: H. C. Stempels, Eric.Stempels@astro.uu.se
Received:
25
February
2002
Accepted:
28
May
2002
We present the first results of our observations of classical T Tauri
Stars with UVES/VLT. The data consists of high signal-to-noise (≥150) and high spectral resolution (
) spectra. A large
simultaneous wavelength coverage throughout most of the visible spectrum
and comparatively short integration times allow us to study variability
on short time-scales, using a number of diagnostics reflecting a wide range
of physical processes. In particular we concentrate on the properties
and geometry of the accretion process in the strongly accreting and
highly variable CTTS RU Lup. We use the evolution of the level of
veiling, the shapes of absorption and emission lines, and correlations
between these diagnostics, to make new measurements of the
fundamental stellar parameters as well as constraints on the accretion
process and its geometry. We also derive the shortest time-scale of
incoherent changes, which has implications for the nature of the
accretion process in RU Lup.
Key words: accretion, accretion disks / stars: pre-main sequence / stars: individual: RU Lup
© ESO, 2002
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