Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...436..831m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 436, no. 2, p. 831-836
Astronomy and Astrophysics
Astronomy
22
Amorphous Materials, Carbon, Carbon Stars, Cosmic Dust, Interstellar Extinction, Stellar Envelopes, Ultraviolet Astronomy, Ultraviolet Spectra, Absorption Spectra, Astronomical Spectroscopy
Scientific paper
Astronomical observations have evidenced that circumstellar extinction toward carbon-rich sources exhibits a broad absorption peak at wavelengths spreading from 230 to 250 nm. In this work we present fits of such sources suggesting that the differences in spectra could be attributed to the hydrogen content of the amorphous carbon grains responsible for the ultraviolet absorption. All the best-fit spectra have been obtained using for the first time a set of experimental data relative to the same kind of submicron particles homogeneously condensed out from carbon vapors in different atmospheres, as it is expected to occur in astronomical environments. Some of the samples were also thermally processed to vary the hydrogen content in the grains.
Blanco Ariel
Fonti Sergio
Muci A. M.
Orofino Vincenzo
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