Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..528c&link_type=abstract
Astrophysical Journal, Part 1, vol. 248, Sept. 1, 1981, p. 528-541.
Astronomy and Astrophysics
Astronomy
65
Carbon, Interstellar Matter, Ion Distribution, Silicon, Ultraviolet Astronomy, Absorption Spectra, Abundance, H Ii Regions, Iue, Line Spectra, Nitrogen Ions, Stellar Structure
Scientific paper
IUE spectrometer observational data are reported on the C IV, Si IV, and N V absorption lines in 46 distant stars at FWHM resolution of 30 km/sec. A simple analytic theory is given for these contributions, including the effects of ionization by a soft X-ray background. While for some of the most distant field stars a photoionized contribution may be ruled out, C IV absorption lines are detected which are shallow and broad. It is suggested that what are being detected in these cases are contributions from the hot interstellar gas that is responsible for the O VI absorption lines. Most of the Si IV and C IV lines probably arise in the H II regions surrounding the observed star or its neighbors.
Cowie Lennox L.
Taylor Washington
York Don G.
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