Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239..502b&link_type=abstract
Astrophysical Journal, Part 1, vol. 239, July 15, 1980, p. 502-514.
Astronomy and Astrophysics
Astrophysics
59
Absorption Spectra, Astronomical Spectroscopy, Interstellar Gas, Ionized Gases, Abundance, H Ii Regions, Line Spectra, Stellar Winds
Scientific paper
Interstellar absorption lines have been observed toward 25 stars with the International Ultraviolet Explorer satellite. Results are presented for observations of interstellar lines of C III, C IV, N V, Si III, and Si IV. Strong lines of Si IV or C IV are seen toward 11 stars. The strengths of these lines are inconsistent with their formation in the same hot gas responsible for the interstellar O IV lines observed with the Copernicus ultraviolet spectrometer. Comparison with simple models of the ionization structures of H II regions around hot stars suggests that the observed column densities of Si III, Si IV, and C IV are in harmony with those expected in normal photoionized nebulae. The line of sight to HD 93250, and O3 V star near Eta Carinae, passes through highly ionized gas that shows features spanning 250 km/s in radial velocity. Stellar wind velocities are presented for 21 of the stars observed in this survey of interstellar absorption lines.
Black John Harry
Dupree Andrea K.
Hartmann Lee W.
Raymond John C.
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