Other
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..314j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 1, 1989, p. 314-317.
Other
24
Abundance, Interstellar Extinction, Interstellar Gas, Molecular Clouds, Cn Emission, Iron, Manganese, Optical Thickness
Scientific paper
Molecular and atomic abundances are examined for 19 lines of sight through dense clouds, each with a peculiar selective extinction curve. The interstellar clouds appear to fall into two distinct categories: CN-rich, with relatively small amounts of neutral iron, or CN-poor, with large amounts of neutral iron. Lines of sight having a CN/(Fe I) abundance ratio about two or greater, are found to have a shallow 2175 A feature relative to the underlying extinction, while the strength of bump is 3.60 + or - 0.36 for the other dense clouds in the present study. The difference is the strength of the extinction bump between these two ensembles is 1.03 + or - 0.23. Several atomic abundances are examined as potential indicators of peculiar extinction. The Mn I upper limits in the present study support that Mn is being preferentially depleted. Fe I is underabundant relative to K I by 0.7 (dex) in the large (CN)/(Fe I) compared to the small (CN)/(Fe I) lines of sight.
Joseph Charles L.
Seab Gregory C.
Snow Theodore P. Jr.
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