Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..103b&link_type=abstract
Lunar and Planetary Science, volume 27, page 103
Physics
1
Grains: Circumstellar, Graphite, Stars: Agb, Stars: Mass Loss, Titanium Carbide
Scientific paper
We have previously described the internal structure and composition of micrometer-sized circumstellar graphite spherules from the Murchison meteorite (separate KFC1; 2.15-2.20 g/cm3 ) that have an onion-like external morphology. Our TEM studies show that the KFC1 spherules (modal size ~1.5 micron) generally consist of nanocrystalline carbon mantled by well-crystallized graphite. The spherules often contain internal crystals of Ti, Zr and Mo refractory carbides (5-200 nm; modal size ~10 nm) that formed prior to (and sometimes served as seeds for) carbon condensation. We have since numerically modeled the growth of graphite spherules and TiC crystals in stellar outflows, to put constraints on the physical conditions responsible for their formation. A related study making use of our observations has been presented by Sharp and Wasserburg.
Amari Sachiko
Bernatowicz Thomas J.
Cowsik Ramanath
Lewis Reed S.
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