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Highly ionized atoms toward HD 93521Results are reported from the HST High Resolution Spectrograph observations of absorption features of C IV and Si IV in the spectrum of the high-latitude O star HD 93521 (l = 183 deg; b = 62 deg). A comparison of Si IV and C IV profiles showed that the FWHM of both features is about 50 km/sec, in contrast to the 7 km/sec found for one of the several S II features. The line centers for C IV and Si IV are at v = -67 km/sec and -60 km/sec, respectively. As the interval velocity decreases from 90 to 50 km/sec, the Si IV/C IV ratio of the column density per unit velocity interval increases from about 0.2 to 0.4. The result is qualitatively consistent with a fountain model of Shapiro and Benjamin (1991) if the slower gas has cooled and recombined more than the faster gas.
Document ID
19920055123
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Spitzer, Lyman, Jr.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fitzpatrick, Edward L.
(Princeton University Observatory, NJ, United States)
Date Acquired
August 15, 2013
Publication Date
May 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 391
Issue: 1 Ma
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
92A37747
Funding Number(s)
CONTRACT_GRANT: NAS5-26555
CONTRACT_GRANT: NAG5-1626
Distribution Limits
Public
Copyright
Other

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