Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..712e&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 2, Dec. 1991, p. 712-717.
Astronomy and Astrophysics
Astrophysics
63
Astronomical Spectroscopy, Carbonaceous Meteorites, Galactic Nuclei, Infrared Absorption, Interstellar Matter, Organic Compounds, Chemical Composition, Hydrogen, Indian Spacecraft, Infrared Spectra, Macromolecules
Scientific paper
The 3-micron spectrum of the Galactic-center source IRS 7 is compared to a spectrum obtained on the deuterium-rich organic polymer extracted from the Orgueil carbonaceous meteorite. The almost-perfect match between the two spectra in the 3.4-micron region suggests that the chemical composition of the interstellar organic matter resembles that of the meteoritic macromolecule. None of the analysis of the 3 main groups of natural terrestrial kerogens that represent various chemical pathways of the maturation process of organic matter shows such a good fit in the 3.4-micron region. In this context the possible interstellar origin is discussed of macromolecular carbon in Orgueil. Assuming that the carbonaceous extract has the same C/H ratio as the interstellar molecules toward IRS 7, it can be calculated that the fraction of cosmic carbon in this interstellar organic grain material is close to half the total abundance of carbon.
Behar Françoise
d'Hendecourt Louis
Ehrenfreund Pascale
Robert Frédéric
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