Other
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1141k&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 692, p. 1141-1149
Other
41
Absorption Spectra, Astronomical Spectroscopy, Diffuse Radiation, Interstellar Matter, Visible Spectrum, Galactic Structure, Interstellar Extinction
Scientific paper
New high-resolution, very high signal-to-noise echelle spectra of the diffuse interstellar bands (DIBs) have been obtained in the wavelength range 5760-5830 and 6100-6200 A in selected lightly to moderately reddened stars. These spectra have been used to search for the existence of substructures in the so-called 5778 band and to identify similar features in another wavelength range. We have detected many weak absorptions in these two spectral regions, and we show that these features are not spectrograph artifacts, telluric (H2O) lines, or absorption features in the atmospheres of the background stars. Thus they must arise in interstellar medium clouds. The spectra of dark interstellar clouds are more complex than imagined until very recently. The pattern of weak features changes as the intensity ratio of the major DIBs at 5780 and 5797 A varies, which suggests than many strong and weak features may belong to the same carrier species.
Krelowski Jacek
Sneden Chistopher
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