Spectroscopy of T Tauri stars with UVES. Observations and analysis of RU Lup

Details Spectroscopy of T Tauri stars with UVES. Observations and analysis of RU Lup Spectroscopy of T Tauri stars with UVES. Observations and analysis of RU Lup

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...391..595s&link_type=abstract

Astronomy and Astrophysics, v.391, p.595-608 (2002)

Astronomy and Astrophysics

Astrophysics

25

Accretion, Accretion Disks, Stars: Pre-Main Sequence, Stars: Individual: Ru Lup

Scientific paper

We present the first results of our observations of classical T Tauri Stars with UVES/VLT. The data consists of high signal-to-noise (ge 150) and high spectral resolution (R ~ 60 000) 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. Based on observations collected at the European Southern Observatory, Chile (proposal 65.I-0404).

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