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Cyclic variability of the circumstellar disk of the Be star $\zeta$ Tauri - II. Testing the 2D global disk oscillation model
Context. About 2/3 of the Be stars present the so-called V/R variations, a phenomenon characterized by the quasi-cyclic variation in the ratio between the violet and red emission peaks of the H i emission lines. These variations are generally explained by global oscillations in the circumstellar disk forming a one-armed …