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Ultraviolet interstellar absorption toward HD 156359, a halo star at 11 kiloparsecs in the direction l = 329 deg and b = -15 degResults based on high-quality multiple IUE high-dispersion spectra are presented for the HD 156359 sight line in the direction l = 328.7 deg and b = -14.5 deg. The UV stellar spectrum of HD 156359 is consistent with an MK classification of O9.7 Ib-II. The high-ionization UV interstellar absorption line in the star's UV spectrum are very broad with negative velocity extensions. Comparison of apparent column density profiles Na(v) for lines within each doublet indicates that there is no significant unresolved saturated structure in the Si IV or N V profiles. Direct integration of the Na(v) profiles for Si IV, C IV, and N V over velocities from -150 km/s to +40 km/s yields total column densities of log N = 14.10, 14.77, and 14.09, respectively. The definite detection of N V absorption lines with profile shapes similar to the Si IV and C IV profiles favors a common origin for all three species.
Document ID
19910050086
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sembach, Kenneth R.
(Washburn Observatory Madison, WI, United States)
Savage, Blair D.
(Washburn Observatory, Madison, WI; Applied Research Corp. Landover, MD, United States)
Massa, Derck
(Applied Research Corp. Landover, MD, United States)
Date Acquired
August 15, 2013
Publication Date
May 1, 1991
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 372
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
91A34709
Funding Number(s)
CONTRACT_GRANT: NAG5-186
CONTRACT_GRANT: NAS5-29301
Distribution Limits
Public
Copyright
Other

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