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Record Details

Record 4 of 2378
Highly ionized gas in the Gum nebula and elsewhere - A comparison of IUE and Copernicus satellite results
Author and Affiliation:
Edgar, Richard J.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Savage, Blair D.(Wisconsin, University, Madison, United States)
Abstract: The data from six high-dispersion IUE echelle spectra are averaged in order to obtain an interstellar absorption line spectrum with an S/N of about 30 and a resolution of about 25 km/s. The interstellar lines of C IV and Si IV are very strong and broad and N V is detected. The profiles for these species and Al III are compared to the Copernicus satellite profiles for O VI. The high ionization lines toward HD 64760 are much stronger and broader than those recorded toward Zeta Pup and Gamma super 2 Vel, the two exciting stars of the Gum nebula. The profiles for Al III and Si IV are similar and considerably narrower than the O VI profile. An origin in photoionized Gum nebula gas is suggested as the most likely explanation for Al III and Si IV. The C IV profile has a high positive velocity wing extending to approximately +80 km/s, which is similar in appearance to the positive velocity portion of the O VI profile. It is inferred that a substantial part of the observed C IV has an origin in the collisionally ionized gas most likely rsponsible for the O VI.
Publication Date: Sep 01, 1992
Document ID:
19920069688
(Acquired Nov 22, 1995)
Accession Number: 92A52312
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 1 (ISSN 0004-637X); 396; 1, Se
Publisher Information: United States
Contract/Grant/Task Num: NAG5-186
Financial Sponsor: NASA; United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 11p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: GUM NEBULA; INTERSTELLAR GAS; INTERSTELLAR MATTER; IONIZED GASES; IUE; OAO 3; ABSORPTION SPECTRA; LINE OF SIGHT; LINE SHAPE; SPECTRAL LINE WIDTH
Imprint And Other Notes: Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 124-134.
Availability Source: Other Sources
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