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Deviations of interstellar extinctions from the mean R-dependent extinction lawAn analysis is conducted of the deviations from the mean extinction law A(lambda)/A(V) over UV wavelengths emphasizing sightlines through bright nebulosities vs dark clouds. The stellar sample is subdivided into sight lines with defined properties, and different behavior is noted for the deviations in the dark-cloud and bright-nebula sight lines. The deviations are correlated within the same wavenumber interval, but unique shapes for the FUV rise in the deviations are observed. Distributions of silicate grains are considered to account for the extinctions at certain wavenumbers that would explain the observations. The FUV rise in the extinctions is theorized to be related to the UV extinction of polycyclic aromatic hydrocarbons.
Document ID
19930027900
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Mathis, John S.
(NASA Headquarters Washington, DC United States)
Cardelli, Jason A.
(Washburn Observatory Madison, WI, United States)
Date Acquired
August 15, 2013
Publication Date
October 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 398
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A11897
Funding Number(s)
CONTRACT_GRANT: NAGW-2520
CONTRACT_GRANT: NAGW-1768
Distribution Limits
Public
Copyright
Other

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