Nucleation studies under the conditions of carbon-rich AGB star envelopes: TiC

Details Nucleation studies under the conditions of carbon-rich AGB star envelopes: TiC Nucleation studies under the conditions of carbon-rich AGB star envelopes: TiC

2011-02-08

arxiv.org/abs/1102.1663v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Scientific paper

Many studies of especially dust nucleation in winds of carbon-rich AGB stars consider primarily carbon as dust forming material. But dust grains formed in such circumstellar envelopes are rather a mixture of several chemical elements such as titanium or silicon in addition to the main component carbon as verified by many investigations of pre-solar grains enclosed in meteorites, for example. In this contribution we focus on the study of the nucleation of titanium carbide particles from the gas phase. Therefore, the necessary properties of molecular titanium carbide clusters have been estimated within density functional approaches and first implications on the homogeneous nucleation of TiC are studied for conditions being representative for circumstellar dust shells around carbon-rich AGB stars.

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