Astronomy and Astrophysics Supplement Series, Vol. 120, November II 1996, 111-126
G.C. Van de Steene, K.C.
Sahu and S.R. Pottasch
Send offprint requests to: G.C. Van de Steene
European Southern Observatory, Casilla 19001,
Santiago 19, Chile
STScI, 3700 San Martin Drive, Baltimore, MD 21218, U.S.A.
Kapteyn Astronomical Institute, P.O. Box 800, NL-9700 AV Groningen, The Netherlands
Received October 11, 1995; accepted April 11, 1996
Abstract:We present H+[NII] images and low resolution spectra of 16 IRAS-selected, southern planetary nebula candidates previously detected in the radio continuum. The H+[NII] 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