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Title:
Interstellar C IV and SI IV column densities toward early-type stars
Authors:
Bruhweiler, F. C.; Kondo, Y.; McCluskey, G. E.
Affiliation:
AA(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, Md.)
Publication:
Astrophysical Journal, Part 1, vol. 237, Apr. 1, 1980, p. 19-25. (ApJ Homepage)
Publication Date:
04/1980
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CARBON, EARLY STARS, INTERSTELLAR MATTER, IUE, O STARS, SILICON, ABUNDANCE, B STARS, GAS DENSITY, LINE SPECTRA, PHOTOIONIZATION, ULTRAVIOLET SPECTRA
Comment:
A&AA ID. AAA027.131.114
DOI:
10.1086/157839
Bibliographic Code:
1980ApJ...237...19B

Abstract

Equivalent widths and deduced column densities of Si IV and C IV are examined for 18 early-type close binaries, and physical processes responsible for the origin of these ions in the interstellar medium are investigated. The available C IV/Si IV column density ratios typically lie within a narrow range from 0.8 to 4.5, and there is evidence that the column density of C IV is higher than that of N V along most lines of sight, suggesting that C IV is not formed in the same hot region as O VI. In addition, the existence of regions with a narrowly defined new temperature range around 50,000 deg K is indicated. The detection of the semitorrid gas of Bruhweiler, Kondo, and McCluskey (1978, 1979) is substantiated, and the relation of this gas to the observations of coronal gas in the galactic halo is discussed.

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