In this thesis, a far-infrared (FIR) study of evolved low and intermediate mass stars is presented. The characterization of these evolved stars is particularly interesting when we analyse their properties in the FIR and the sub-millimeter wavelength regions. Due to the very promising spectroscopic data of Herschel, PACS (50-220 μm) and SPIRE (200-600 μm) observations have been included in this thesis to carry out a systematic an homogeneous study of a relatively big sample of evolved stars which cover different evolutionary stages (AGBs, post-AGBs and PNe) and chemical types.
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