We give spectral line intensities, electron temperatures, electron densities, and chemical compositions for 25 compact planetary nebulae observed with the IIDS at Kitt Peak. Several (Ha 3-75, He 2-15, K 3-89, M 1-16, M 2-52, and M 3-28) are found to be especially rich in helium and/or nitrogen (He/H>0.15; N/O>1). The results minimally confirm the correlation between N/O and He/H, but also confirm the intrinsic scatter in the relation, as N-rich nebulae can be unenriched in He and vice versa.
|Original language||English (US)|
|Number of pages||6|
|Journal||Publications of the Astronomical Society of the Pacific|
|State||Published - Nov 1996|
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science