On the 2800 A interstellar extinction feature

Details On the 2800 A interstellar extinction feature On the 2800 A interstellar extinction feature

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.100..431k&link_type=abstract

Astrophysics and Space Science (ISSN 0004- 640X), vol. 100, no. 1-2, March 1984, p. 431-435.

Astronomy and Astrophysics

Astrophysics

3

Absorption Spectra, Granular Materials, Graphite, Interstellar Extinction, Stellar Spectra, Ultraviolet Absorption, Bacteria, Interstellar Matter, Iue, Satellite Observation, Tryptophan

Scientific paper

Two criticisms of a finding that an interstellar feature near 2800 A is due to proteinaceous material in the interstellar medium are answered. While the astronomical data cannot be taken to imply uniquely the presence of interstellar tryptophan, they do serve as a consistency check of the bacterial grain model. The additional absorptions shortward of 2400 A which should be observed for tryptophan may be masked by over-whelmingly strong absorption due to graphite grains. In answer to the second criticism, it is argued that significant saturation effects could not have occurred in all of the sample spectra. Other IUE spectra published by other authors which imply a slight excess of extinction near 2800 A are shown, and their similarity to the expected behavior of coliform bacteria is noted.

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