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High-resolution ultra-violet observations of the interstellar diffuse clouds toward Mu ColumbaeData obtained from the Goddard High Resolution spectrograph (GHRS) are used to study differences in gas-phase abundances of ions occurring in the diffuse neutral clouds toward mu Col. The sight-line characteristics determined in previous studies are reviewed and results for the cloud velocities, absorption equivalent widths, ion column densities, and depletions are presented. It is found that interstellar features from four distinct absorption regions with low-ionization gas are apparent in the GHRS data at heliocentric velocities of 23, 41, 53, and 62 km/s. Absorption by Mg II, Si II, and possibly Al II also occurs over the heliocentric velocity range from -17 to 0 km/s. The presence of stronger Si III absorption over this velocity region indicates that the absorption arises from an ionized gas region.
Document ID
19930068051
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sofia, Ulysses J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Savage, Blair D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cardelli, Jason A.
(Washburn Observatory Madison, WI, United States)
Date Acquired
August 16, 2013
Publication Date
August 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 413
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A52048
Funding Number(s)
CONTRACT_GRANT: NGT-50426
CONTRACT_GRANT: NAGW-2520
CONTRACT_GRANT: NAG5-1852
Distribution Limits
Public
Copyright
Other

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