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Fig. 4


Low-resolution optical spectra of the AA Tau system. Top panel: the Calar Alto Cafos spectra obtained on Dec. 13 and 23 Dec. 2011 are shown over the wavelength range 480–770 nm. The continuum has been normalized to unity at the base of the Hα line and the flux of the latter spectrum shifted by +0.5 for clarity. Lower panel: the average of 57 AA Tau lowres spectra obtained in the bright state in Nov. 1995 is shown for comparison (from Bouvier et al. 1999).

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