Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..107j&link_type=abstract
Astrophysical Journal, Part 1, vol. 220, Feb. 15, 1978, p. 107-123.
Astronomy and Astrophysics
Astrophysics
164
Absorption Spectra, Interstellar Matter, Milky Way Galaxy, Oxygen Spectra, Statistical Analysis, Radial Velocity, Spatial Distribution, Statistical Distributions, Temperature Distribution
Scientific paper
This paper deals with general inferences about the low-density phase of interstellar gas having temperatures well above 200,000 K (the 'coronal gas') which can be drawn from O VI absorption data for 72 stars. Attention is given to the behavior of radial velocities, possible evidence for circumstellar O VI, the space distribution of the O VI gas, crowding of normal interstellar gas, and temperature distributions for the coronal gas. A model is adopted in which the coronal gas is contained within randomly distributed and nonoverlapping parcels, each with a size, pressure, and internal temperature distribution that do not vary markedly from one unit to the next. It is shown that the one-dimensional velocity dispersion for O VI regions (26 km/s) is substantially higher than the value for ordinary interstellar clouds (6.4 km/s).
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