ON THE RELATION BETWEEN THE CARRIERS OF DIFFUSE INTERSTELLAR BANDS AND SIMPLE MOLECULAR-SPECIES

Citation
Ga. Galazutdinov et al., ON THE RELATION BETWEEN THE CARRIERS OF DIFFUSE INTERSTELLAR BANDS AND SIMPLE MOLECULAR-SPECIES, Monthly Notices of the Royal Astronomical Society, 292(2), 1997, pp. 414-418
Citations number
16
ISSN journal
00358711
Volume
292
Issue
2
Year of publication
1997
Pages
414 - 418
Database
ISI
SICI code
0035-8711(1997)292:2<414:OTRBTC>2.0.ZU;2-R
Abstract
The interstellar clouds composed mostly of neutral hydrogen (H I cloud s) show evident differences in the pattern of interstellar absorptions : in the shapes of the extinction curves, the strengths of the diffuse interstellar bands and the intensities of the features originating in simple molecular species. It is well known that the ratio of the two prominent diffuse bands (5780 and 5797 Angstrom) varies strongly from cloud to cloud; our data suggest that this phenomenon is related to th e intensities of the absorption features of interstellar molecules suc h as CH+ or CH. However, the intensity ratio of the diffuse bands can change gradually, suggesting a 'smooth' variation of the carrier abund ances, while the strength ratios of molecular features and the colour excesses change rather stepwise when the diffuse band ratio reaches a certain value.