Spectrophotometric Studies of Gaseous Nebulae. III. The Low-Excitation Ring Planetary IC 418.
Abstract
Plates taken at the coude and prime foci of the Lick 120-inch and at the Mount Wilson 1004nch coude are combined to yield line intensities in the region XX 310() 5000 A for the bright, compact, rather regular nebula, IC 418. Line intensities are given both for the bright hydrogen ring and for a strip through the center of the nebula to show the effects of stratification. Average intensities that should approximate those of the integrated light of the nebula are also given. Intensities of emission lines from the central star have been measured and compared with the results of earlier work.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 1964
- DOI:
- 10.1086/147996
- Bibcode:
- 1964ApJ...140..936A