Abstract
ABSTRACT The paper presents a discussion of the relations between strong and weak unidentified interstellar features in the spectral range 5760 and 5860 Å, i.e., between the two strong stellar lines of Si III (5740 Å) and He 1(5876 Å). The analysis is made by means of making average spectra (to raise the signal-to-noise ratio) of rapidly rotating stars which diffuses their spectral lines, leaving only interstellar features in the considered range. We divide our sample of stars, shining through apparently single interstellar clouds, into two subsamples characterized by very different strength ratios of the two prominent diffuse bands at 5780 and 5797 Å. By normalizing both spectra to the central depths of different strong diffuse bands, we are able to show that the weak features are apparently closely related to them.
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