Other
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..234a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Sept. 15, 1991, p. 234-245. Research supported by
Other
39
Absorption Spectra, Dark Matter, Diffuse Radiation, Interstellar Matter, Molecular Clouds, Spectral Bands, Cosmic Dust, Interstellar Extinction, Taurus Constellation, Ultraviolet Radiation
Scientific paper
This paper presents strengths and profiles of seven diffuse interstellar bands measured in a group of field stars situated behind the Taurus dark cloud complex. Comparison with the current 'band family' theories shows that, within a single complex, the relative proportions of different family carriers can vary in rather close unions: although correlations with extinction are poor in all cases, some pairs of bands are nonetheless strongly interrelated. Band strengths relative to reddening are investigated and found to be reasonably well fitted by a model in which all of the DIB production takes place in a surface layer of the cloud. These results are compared with existing data for the Rho Oph cloud. Band production efficiency varies in the same way in both regions, falling rapidly with increasing E(B-V) to a limiting value a factor of 3-10 below the norm for the diffuse ISM. Comparison of grain properties and the UV radiation field in the two cases shows that the relative weakness of the diffuse bands in dark clouds is driven by changing grain properties rather than by species or other ionized molecules.
Adamson Andrew J.
Duley Walter W.
Whittet Doug C. B.
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