Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1021c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 1021-1032.
Astronomy and Astrophysics
Astronomy
61
Interstellar Extinction, Interstellar Matter, Molecular Clouds, Astronomical Photometry, Infrared Spectra, Iue, Particle Size Distribution, Ultraviolet Spectra
Scientific paper
The range of validity of the average absolute extinction law (AAEL) proposed by Cardelli et al. (1988 and 1989) is investigated, combining published visible and NIR data with IUE UV observations for three lines of sight through dense dark cloud environments with high values of total-to-selective extinction. The characteristics of the data sets and the reduction and parameterization methods applied are described in detail, and the results are presented in extensive tables and graphs. Good agreement with the AAEL is demonstrated for wavelengths from 3.4 microns to 250 nm, but significant deviations are found at shorter wavelengths (where previous studies of lines of sight through bright nebulosity found good agreement with the AAEL). These differences are attributed to the effects of coatings on small-bump and FUV grains.
Cardelli Jason A.
Clayton Geoffrey C.
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