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Changes in interstellar atomic abundances from the galactic plane to the haloA few, specially selected interstellar absorption lines were measured in the high resolution, far ultraviolet spectra of 200 O and B type stars observed by the International Ultraviolet Explorer (IUE). For lines of sight extending beyond about 500 pc from the galactic plane, the abundance of singly ionized iron atoms increases relative to singly ionized sulfur. However, the relative abundances of singly ionized sulfur, silicon and aluminum do not seem to change appreciably. An explanation for the apparent increase of iron is the partial sputtering of material off the surfaces of dust grains by interstellar shocks. Another possibility might be that the ejecta from type I supernovae enrich the low density medium in the halo with iron.
Document ID
19820025434
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Jenkins, E. B. (Princeton Univ. Observatory NJ, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1982
Subject Category
Astrophysics
Report/Patent Number
NAS 1.26:169324
NASA-CR-169324
Accession Number
82N33310
Funding Number(s)
CONTRACT_GRANT: NSG-5248
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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