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Highly-ionized species in the interstellar mediumInterstellar 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.
Document ID
19800066201
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Black, J. H.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Hartmann, L. W.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Raymond, J. C.
(Harvard-Smithsonian Center for Astrophysics Cambridge, Mass., United States)
Dupree, A. K.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 10, 2013
Publication Date
July 15, 1980
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
80A50371
Funding Number(s)
CONTRACT_GRANT: NSG-7176
CONTRACT_GRANT: NSG-5237
CONTRACT_GRANT: NSG-5380
Distribution Limits
Public
Copyright
Other

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