The [Ne IV] 2D -> 4S lines in the planetary nebula NGC 7662.
Abstract
Results are reported for high-resolution IUE satellite observations of the 2p 3 2D 3/2 - 4S, 2D 5/2 - 4S UV forbidden lines of Ne IV in the spectrum of NGC 7662. Precision measurements of the wavelengths are obtained, along with an improved determination of Ne IV doublet-quartet separations, a measurement of the intensity ratio for the forbidden Ne IV lines, and velocity profiles for the 2D - 4S lines. A nebular expansion velocity of 20 + or - 3 km/s is measured for the 2D 3/2 - 4S forbidden line of Ne IV.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 1979
- DOI:
- 10.1093/mnras/187.1.1P
- Bibcode:
- 1979MNRAS.187P...1L
- Keywords:
-
- Fine Structure;
- Forbidden Bands;
- Neon;
- Planetary Nebulae;
- Spectrum Analysis;
- Stellar Spectra;
- Ultraviolet Spectra;
- Iue;
- Spectral Resolution;
- Velocity Distribution;
- Astrophysics;
- Planetary Nebulae:UV Spectra