Highly Ionized Atoms Observed with Copernicus
Abstract
Based on high-resolution observations using the Princeton satellite/spectrometer on Copernicus the O VI doublet is discussed in detail, in conjunction with data for the resonance lines of N V, Si IV, and S IV reported in five stars. The temperature, density, and the possible extent of the O VI producing region are discussed. The ratio N(S IV)/N(O VI) is used to derive a lower limit to the temperature in the O VI producing region. In near pressure equilibrium with normal interstellar clouds and H II regions minimum densities are found to be consistent with a hot plasma.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1974
- DOI:
- 10.1086/181648
- Bibcode:
- 1974ApJ...193L.127Y
- Keywords:
-
- Interstellar Gas;
- Oxygen Ions;
- Oxygen Spectra;
- Spaceborne Astronomy;
- Spectral Line Width;
- Stellar Spectra;
- Abundance;
- Cosmic Plasma;
- H Ii Regions;
- High Temperature Plasmas;
- Ionized Gases;
- Line Spectra;
- Oao 3;
- Satellite Observation;
- Stellar Temperature;
- Astrophysics