A radio study of Planetary nebulae.

The thesis describes the results of extended radio observations of pn, both in continuum and spectral line. The radio emission provides an important tool for studying pn. Firstly, it is not affected by interstellar extinction, as is the
case for optical emission. Secondly, radio continuum arises from interaction between electrons and protons, and therefore traces the major component of the ionized gas. Optical emission lines (with the exception of the hydrogen
lines) arise from one particular ion, which may only be found in certain regions of the nebula. The structure of the nebula can therefore be better studied using the radio emission. A drawback is that radio emission is generally weak. Thus,
sensitive instruments are required. ...

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Summary

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