Shapes and correlations as observational discriminants for the origin of diffuse bands

Bibcode
1986ApJ...305..455C
DOI
10.1086/164259
Chlewicki, G.; van der Zwet, G. P.; van Ijzendoorn, L. J.; Greenberg, J. M.; Alvarez, P. P.
Bibliographical reference

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 1, 1986, p. 455-466. Research supported by the Stichting voor Fundamenteel Onderzoek der Materie and Kerkhoven-Boscha Foundation.

Advertised on:
6
1986
Journal
Astrophysical Journal
Number of authors
5
IAC number of authors
1
Citations
65
Refereed citations
57
Description
The authors have measured the intensities of several diffuse interstellar bands in intermediate resolution spectra (0.35 - 0.65 Å) of heavily reddened early-type stars in three associations: Cas OB6, Be 87, and Cyg OB2. The extinction is attributed mostly to material at intermediate densities between molecular clouds and the diffuse medium. The degree of correlation with EB-V separates the lines into at least two groups. The analysis of line profiles reveals a wide variety of shapes even among strongly correlated lines, ranging from a nearly symmetric Lorentzian for λ6284 to a highly complex multiple structure of λ6203+λ6205. These observational facts appear to preclude the origin of the lines in bulk solid particles and favor their explanation as vibronic transitions in large molecules.
Type
Refereed
Interstellar extinction
Star clusters
Molecular clouds

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