Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...223..329b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 223, no. 1-2, Oct. 1989, p. 329-335.
Astronomy and Astrophysics
Astronomy
21
Absorption Spectra, Interstellar Matter, Stellar Spectra, Ultraviolet Astronomy, Cosmic Dust, Diffuse Radiation, Telluric Lines, Visible Spectrum
Scientific paper
Six diffuse absorption bands (5780, 5797, 6196, 6203, 6270 and 6284 A) have been measured in a sample of 26 galactic stars. The strength of these features has been compared with the interstellar absorption band at 2175 A. After canceling the intrinsic correlation due to the generally constant gas-to-dust ratio of the interstellar medium, no further correlation between the UV bump and the observed DIBs was found, suggesting thst dust and the carrier(s) of the DIBs, although coexisting in the interstellar medium, have an independent history. Some degree of correlation is found, however, among the DIBs themselves, suggesting the possible existence of 'families' of features. Finally, the data support the hypothesis that the Herbig band at 6203.06 A is a blend of two features at 6202.99 and 6205.09 A having a constant intensity ratio.
Benvenuti Piero
Porceddu Ignazio
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