Ultraviolet spectra of planetary nebulae. 6 NGC 7662.
Abstract
The planetary nebula NGC 7662 considered in the present investigation has been a popular object for detailed modelling. Two models are considered. In Model I, which is similar to a model considered by Harrington et al. (1979), dust absorption is neglected. The model cannot provide results which are in agreement with two types of observational data. It is believed that Model II gives a better description of NGC 7662. Observations are considered along with aspects of data extraction and reduction, absolute flux measurements, the accuracy of the measurements made with the aid of the International Ultraviolet Explorer (IUE) spacecraft, and the continuum fluxes. The temperature of the central star is discussed, taking into account Zanstra temperatures, and the color temperature from IUE observations. Attention is also given to adopted fluxes in nebular lines, the computer program for models of planetary nebulae, and model results.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 1982
- DOI:
- 10.1093/mnras/199.3.517
- Bibcode:
- 1982MNRAS.199..517H
- Keywords:
-
- Astronomical Models;
- Astronomical Spectroscopy;
- Planetary Nebulae;
- Ultraviolet Spectra;
- Abundance;
- Brightness Distribution;
- Data Reduction;
- Gas Ionization;
- H Lines;
- Iue;
- Lyman Alpha Radiation;
- Radiative Transfer;
- Stellar Radiation;
- Astrophysics