Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...502..284m&link_type=abstract
Astrophysical Journal v.502, p.284
Astronomy and Astrophysics
Astronomy
28
Stars: Circumstellar Matter, Ism: Dust, Extinction, Ism: Molecules, Molecular Processes, Stars: Carbon
Scientific paper
We report the measurement of polycyclic aromatic hydrocarbons (PAHs) in individual circumstellar graphite grains extracted from two primitive meteorites, Murchison and Acfer 094. The 12C/13C isotope ratios of the grains in this study range from 2.4 to 1700. Roughly 70% of the grains have an appreciable concentration of PAHs (500-5000 parts per million [ppm]). Independent molecule-specific isotopic analyses show that most of the PAHs appear isotopically normal, but in several cases correlated isotopic anomalies are observed between one or more molecules and their parent grains. These correlations are most evident for 13C-depleted grains. Possible origins of the PAHs in the graphite grains are discussed.
Amari Sachiko
Chillier Xavier D. F.
Clemett Simon J.
Gao XingHui
Lewis Reed S.
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