Amorphous carbon and carbonaceous materials in space. I - Laboratory measurements. II - Astrophysical implications

Details Amorphous carbon and carbonaceous materials in space. I - Laboratory measurements. II - Astrophysical implications Amorphous carbon and carbonaceous materials in space. I - Laboratory measurements. II - Astrophysical implications

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ncimc..13..231b&link_type=abstract

Nuovo Cimento C, Serie 1 (ISSN 0390-5551), vol. 13 C, Jan.-Feb. 1990, p. 231-239, 241-247. Research supported by MPI and CNR.

Other

Amorphous Materials, Carbonaceous Materials, Interplanetary Dust, Interstellar Matter, Cyclic Hydrocarbons, Far Ultraviolet Radiation, Graphite, Infrared Spectra, Raman Spectra, Stellar Spectra

Scientific paper

Interstellar dust particles and their effects on observations of distant objects are investigated by means of laboratory simulations. VUV and visible extinction measurements and Raman spectra are presented for submicron particles of amorphous carbon (produced by arc discharge in an Ar atmosphere and by burning benzene in air) and other carbonaceous materials (chars, coal tar, chrysene, and coronene). These data are then employed in fitting an amorphous-carbon/silicon-carbide dust spectrum to observational data on the carbon star GL799 (Cohen, 1984). A mixture containing about 25 wt pct of beta-SiC is shown to give good agreement in both the 11.3-micron band and the continuum. Also shown is a fitting of the spectrum of Comet Halley in the 3-4-micron region; good results are obtained using highly hydrogenated amorphous carbon grains with a dominant sp3 character.

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