Volume 391, Number 2, August IV 2002
|Page(s)||595 - 608|
|Section||Interstellar and circumstellar matter|
|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
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.