Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..455c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 1, 1986, p. 455-466. Research supported by the Stichting voor Fun
Astronomy and Astrophysics
Astrophysics
52
Early Stars, Interstellar Extinction, Interstellar Matter, Star Clusters, Stellar Spectra, Molecular Clouds, Spectral Correlation
Scientific paper
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.
Álvarez Pablo
Chlewicki Grzegorz
Greenberg Mayo J.
van der Zwet G. P.
van Ijzendoorn Leonardus Josephus
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