Disks around T Tauri stars: observations and interpretations.

Physics

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Scientific paper

Observational and theoretical approaches are presented to determine physical properties of disks around T Tauri stars. An experiment for deducing the inner disk radius is described. Observations of Hα line equivalent width variations were performed together with quasi-simultaneous broadband photometry and low-resolution spectra for a sample of southern T Tauri sources. The origins of these variations are discussed with a view towards circumstellar disks. The outcome of millimeter-wave observations of T Tauri systems is presented; they serve as a means of determining outer disk radii and total disk masses. The uncertainties in disk mass determinations are discussed in the framework of a standard disk model. Strong evidence for the presence of disks was found by inspecting the influence of binaries on the mm flux. Also, weak-line T Tauri stars were shown to behave differently than classical T Tauri stars regarding mm emission. A simple three-dimensional disk model is described to explain the apparent deviations of observed spectral energy distributions from those expected from standard disk theory. Finally, eccentric accretion disks are introduced.

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