Spectrophotometric Studies of Gaseous Nebulae. XI. The Planetary NGC 6543
Abstract
By means of photographic and photoelectric techniques, we have measured the emission-line intensities in the spectrum between XX3187 and 5175 of the planetary NGC 6543, which is an irregular object of excitation class 5. This object shows a range of excitation from Mg i to N iii as well as a number of for- bidden transitions involving ions from [0 iij to [K iv]. The determination of the electron density and temperature by methods involving forbidden lines yields Te `-- 82000 K and N 5.6 X 1O~ electrons cm3. The latter value is also confirmed by surface-brightness measurements
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1968
- DOI:
- 10.1086/149780
- Bibcode:
- 1968ApJ...154..543C