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Diffuse envelopes around Mira variables are among the most important sourcesinfluencing the chemical evolution of galaxies. However they represent anobservational challenge because of their complex spectral features and theirrapid temporal variability. We constrained the exact brightness distribution ofthe Mira star TLep with a model-independent analysis. We obtained single-epochinterferometric observations with a dataset continuous in the spectral domain(1.5-2.4mum) and in the spatial domain (baselines ranging from 11 to 96m). Weperformed a model independent image reconstruction for each spectral bin usingthe MIRA software. We completed the analysis by modeling the data with a simplestar+layer model inspired from the images. Reconstructed images confirm thegeneral picture of a central star partially obscured by the surroundingmolecular shell of changing opacity. At 1.7mum, the shell becomes opticallythin, with corresponding emission appearing as a ring circling the star. Thisis the first direct evidence of the spherical morphology of the molecularshell. Model fitting confirmed a spherical layer of constant size and changingopacity over the wavelengths. Rough modeling points to a continuum opacitywithin the shell, in addition to the CO and H2O features. Accordingly, itappeared impossible to model the data by a photosphere alone in any of thespectral bins.

Pre-maximum spectro-imaging of the Mira star T Lep with AMBER/VLTI