Ultra-violet observations of Nova Cygni 1978
Abstract
Ultra-violet observations of Nova Cygni 1978 made with IUE are described. The time development of the spectra is discussed and the main spectral features characteristic of the maximum, early decline, transitional and nebular stages are outlined. An estimate of the colour excess is obtained. Total observed fluxes from the nova have been calculated for the first 50 days, including estimates of optical and infra-red contributions. The flux is found to decline by a factor of two to three over the first 8 days after maximum light, and by a further factor two between 8 and 50 days after maximum. Temperatures are deduced from line ratios in C II and C III, and the abundance ratio of nitrogen to carbon is derived. Nitrogen is found to be overabundant relative to carbon by a factor of 5 to 8 compared to the cosmic value
- Publication:
-
The First Year of IUE
- Pub Date:
- 1979
- Bibcode:
- 1979IUE1.symp...63S
- Keywords:
-
- Cygnus Constellation;
- Iue;
- Line Spectra;
- Stellar Spectra;
- Ultraviolet Astronomy;
- Abundance;
- Carbon;
- Color;
- Emission Spectra;
- High Resolution;
- Infrared Spectra;
- Nitrogen;
- Wavelengths;
- Astrophysics