Fig. A.1
Images of objects with non-detection of the envelope. Ticks indicate the AGB star. Top row, left to right: IRAS 00193−4033 (AFGL 5017), EFOSC2 V-band image. IRAS 04575+1251 (AFGL 5134), EFOSC2 V-band image. IRAS 05418−3224, EFOSC2 B-band image. Bottom row, left to right: IRAS 06255−4928, EFOSC2 B-band image. IRAS 09521−7508, EMMI B-band image. IRAS 20042−4241, EMMI B-band image.
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