A VOLUME-LIMITED SURVEY OF HIGH GALACTIC LATITUDE PLANETARY-NEBULAE WITH THE EXTREME-ULTRAVIOLET EXPLORER

We present the results of a complete survey, at extreme-ultraviolet (E UV) wavelengths (58-234 Angstrom), of the high Galactic latitude (\b\ greater than or equal to 20 degrees) planetary nebulae (PNs) with at l east one determination of the distance within 1 kpc of the Sun. The sa mple comprises 27 objects observed during the Extreme Ultraviolet Expl orer (EUVE) all-sky survey and represents the majority of PN likely to be accessible at EUV wavelengths. Six PNs (NGC 246, NGC 1360, K1-16, LoTr 5, NGC 4361, and NGC 3587) were detected in the shortest EUV band (58-174 Angstrom). A seventh PN (NGC 6853), not included in the sampl e, was also detected during the survey. The emission is consistent in all cases with that of a point source and therefore most probably orig inates from the PN central star. Accurate EUV count rates or upper lim its in the two shorter EUVE bands (centered at approximate to 100 and 200 Angstrom) are given for all the sources in the sample. NGC 4361 an d NGC 3587 are reported here for the first time as sources of EUV radi ation. As might be expected, attenuation by the interstellar medium do minates the PN distribution in the EUV sky.