Optical observations of southern planetary nebula candidates *
European Southern Observatory, Casilla 19001, Santiago 19, Chile
2 Kapteyn Astronomical Institute, P.O. Box 800, NL-9700 AV Groningen, The Netherlands
3 STScI, 3700 San Martin Drive, Baltimore, MD 21218, U.S.A.
Send offprint request to: G.C. Van de Steene
Accepted: 11 April 1996
We present Hα+[N ii] images and low resolution spectra of 16 IRAS-selected, southern planetary nebula candidates previously detected in the radio continuum. The Hα+[N ii] images are presented as finding charts. Contour plots are shown for the resolved planetary nebulae. From these images mean optical angular diameters were determined. Optical spectra show that these IRAS-selected and radio detected planetary nebula candidates are indeed planetary nebulae. The values for their extinction coefficient is generally very high. More than half of the planetary nebulae seem to be of low excitation, having central stars with an effective temperature of probably ~ 60 000 K or less.
Key words: planetary nebulae: general
© European Southern Observatory (ESO), 1996