The 3.4-micron interstellar absorption feature

Details The 3.4-micron interstellar absorption feature The 3.4-micron interstellar absorption feature

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.287..518w&link_type=abstract

Nature, vol. 287, Oct. 9, 1980, p. 518, 519.

Astronomy and Astrophysics

Astronomy

41

Hydrocarbons, Infrared Absorption, Infrared Astronomy, Interstellar Extinction, Interstellar Matter, Stellar Spectra, Absorption Spectra, Optical Thickness, Stellar Spectrophotometry

Scientific paper

The detection of a 3.4-micron absorption feature is reported for three IR sources with a visual extinction, Av, in the range 10-35, which lack the 3.1-micron ice absorption band. The observations are used together with the results of Duley and Williams (1979) to estimate the fraction of carbon that is required to be organic material. It is found that about 10% may exist in alkanes, whereas the unsaturated hydrocarbons (alkenes, alkynes, or aromatics) would account for the visual extinction as well as the 3.4-micron absorption with no requirement for any other grain material. The results suggest that an appreciable fraction of the observed IR and visual extinction may arise from grains that are largely organic in character.

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