We demonstrate the result, based on numerous spectra of the star AE Aur (HD 34078), covering the period 1997 - 2016. We prove that all strong diffuse interstellar bands (DIBs) are of the same intensity during the whole period of observations (inside 3 -- 5 % of the intensity). This is in sharp contrast to the behaviour of both CH and CH+ features which, during the last 6 years, declined sharply by 13% and 28% respectively. Diffuse bands seem to behave more or less as interstellar atomic lines. Apparently diffuse interstellar bands (whose profiles are peculiar in HD 34078) do not vary in unison with simple interstellar radicals. We checked also the behaviour of CaII lines which should be of constant intensities as the carrier fills the interstellar space evenly. Our observations confirm this and allow to re-estimate the distance to HD34078.

Constant intensities of diffuse interstellar bands in the spectrum of AE Aur

254th National Meeting (2017)

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