2 Observations

The observations have been made at the European Southern Observatory with several different telescopes and instruments, and over a period of a few years. In all cases the detector was a CCD, and the great majority of the images has been secured with the Dutch 91 cm telescope. In Table 1 we list the instrumental parameters for all the observations.

  

Table 1: Telescopes, CCDs and pixel scales used

The observations have all been made during the 1993 to 1995 period. Data have been taken through narrow band filters centred on the following emission lines: H$\alpha$656.3 nm, H$\beta$486.1 nm, [OIII]500.7 nm, and [NII]658.4 nm. The FWHM of the filters were typically 3 nm, so some contamination of the [NII]images with H$\alpha$light is present but at low level (about 5%). Nearly all objects have an H$\alpha$ image but only some have had the other lines recorded. In total we present 198 images of 100 southern and 1 northern PN.

All data were bias subtracted and flat fielded in the usual way but no flux calibration was done.