Problems with the interpretation of the 220 nm interstellar feature |
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| Authors: | C Friedemann J Gürtler |
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| Institution: | (1) Universitäts-Sternwarte Jena, GDR |
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| Abstract: | The bump in the ultraviolet part of the interstellar extinction curve provides a great challenge in the modelling of interstellar dust. Its shape can be well approximated by a classical dispersion profile with a total halfwidth of 48 nm centred at 217 nm. Apart from few slightly deviating cases the parameters of the band seem to be surprisingly constant in the solar neighbourhood.The equivalent widthW of the 217 nm band shows a very tight correlation with the colour excessE(B-V). Studies of correlations with the strength of diffuse interstellar bands gave no conclusive results as to the nature of the band.The most common interpretation of the 217 nm feature as originating from small graphite grians meets several difficulties. No final decision on the carrier can be made at present.Paper presented at a Workshop on  The Role of Dust in Dense Regions of Interstellar Matter , held at Georgenthal, G.D.R., in March 1986. |
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