All Tables

• Table 1: Log of the spectroscopic observations.
• Table 2: Log of the direct imaging observations.
• Table 3: List of IRAS fields observed. The astrometric coordinates are given for all sources but for those without optical counterparts and without precise infrared measurements. IRAS colours are defined in Sect. 3. The run number is referred to Table 1.
• Table 4: Main characteristics derived for the IRAS sources identified as post-AGB stars.
• Table 5: Main characteristics derived for the IRAS sources identified as transition objects.
• Table 6: Main characteristics derived from the optical images and spectra of the IRAS sources identified as PNe.