First evidence of DIB (diffuse interstellar bands) carriers in the circumstellar shell of a carbon star.

Details First evidence of DIB (diffuse interstellar bands) carriers in the circumstellar shell of a carbon star. First evidence of DIB (diffuse interstellar bands) carriers in the circumstellar shell of a carbon star.

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990msngr..59...46l&link_type=abstract

The Messenger, vol. 59, p. 46-47

Astronomy and Astrophysics

Astronomy

2

Circumstellar Shells: Carbon Stars, Interstellar Bands: Carbon Stars

Scientific paper

The origin of the diffuse interstellar bands (DIBs) represents one of the longest standing unsolved problems in astronomy. Although it is weil established that they originate in the interstellar medium, no convincing identification of the responsible agent(s) has yet been made. They could be produced by large molecules, e. g. the fashionable polycyclic aromatic hydrocarbons (PAHs), or by atoms adsorbed on interstellar grains. A search for DIB features in stars with circumstellar dust shells (CDSs), carried out twenty years ago, was unsuccessful. It was therefore inferred that the DIB agents are not present in the circumstellar environments of late-type stars. Since then sky surveys have been made in the infrared range and have revealed the existence of numerous red long-period variables, very often enshrouded inside dense CDSs; most of these objects are miras evolving through the asymptotic giant branch (AGB). There is growing evidence that these sources are among the main contributors to the replenishment of the interstellar medium. In these conditions the absence of DIBs in the spectra of late-type stars appears puzzling. With the new instruments and better detectors available today, it seems worth to readdress observationally this problem.

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