Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510..999c&link_type=abstract
The Astrophysical Journal, Volume 510, Issue 2, pp. 999-1010.
Astronomy and Astrophysics
Astronomy
14
Stars: Circumstellar Matter, Ism: Dust, Extinction, Meteors, Meteoroids, Stars: Agb And Post-Agb, Stars: Mass Loss
Scientific paper
Formation of TiC and graphite grains in the gas outflows from carbon-rich asymptotic giant branch (AGB) stars is investigated to reveal the formation conditions of presolar TiC core-graphite mantle spherules extracted from the Murchison meteorite. We employ the nonequilibrium condensation theory involving chemical reactions in nucleation and grain growth to derive the formation conditions not only from the condensation sequence for realizing the core-mantle structure but also from the sizes of observed TiC cores and graphite mantles. The results of calculations show that the sizes of TiC cores constrain the mass-loss rate M and the gas outflow velocity v at the formation sites to satisfy the relation 2.5x10^-3
Chigai Takeshi
Kozasa Takashi
Yamamoto Tetsuo
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