Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...193l.127y&link_type=abstract
Astrophysical Journal, vol. 193, Nov. 1, 1974, pt. 2, p. L127-L131.
Astronomy and Astrophysics
Astronomy
123
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
Scientific paper
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.
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