Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..831w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 4, p. 831-838.
Astronomy and Astrophysics
Astronomy
19
Diffuse Radiation, Interstellar Matter, Line Spectra, Molecular Clouds, Hydrogen Atoms, Molecular Spectra, Spectral Bands
Scientific paper
Consideration is given to a theory in which the carriers of the diffuse interstellar bands are members of an unspecified class of molecular hydrides. Carriers with different numbers of hydrogen atoms per molecule in the interstellar population are expected to have different interstellar habitats, and it is suggested that this underlies the observational partitioning of the bands into families. The carriers are assumed to be well mixed with the interstellar gas and dust, but even so the equivalent width of any band is not simply proportional to the reddening E(B-V); it also depends on what fraction of the population along the line of sight is in the form of the appropriate carrier. The fraction is an independent variable whose behavior is expected to leave distinctive effects on plots of the equivalent width against E(B-V), and these effects are sought in measurements of 5797 and 5780 A. The fractional abundance of both carriers is low in dense gas, and there are differences between the plots which indicate that the carrier of 5780 A bears more hydrogen atoms than that of 5797. Reasons for considering the fulleranes C60H(m) as the carriers are given.
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