Silicon carbide clusters in circumstellar environment

Details Silicon carbide clusters in circumstellar environment Silicon carbide clusters in circumstellar environment

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.224..531p&link_type=abstract

Astrophysics and Space Science, Volume 224, Issue 1-2, pp. 531-531

Astronomy and Astrophysics

Astrophysics

Stars:Silicon Carbide, Stars:Stellar Winds

Scientific paper

The presence of small clusters of silicon carbide (SiC) in circumstellar dust shells surrounding late-type stars is inferred from a broad emission feature peaking at around 11 micrometre in infrared spectra (Little-Marenin ,1986 ApJ Lett. 307, L15). These clusters are expected to condense from molecular arrangements composed of a few carbon and silicium atoms which are present in stellar winds surrounding carbon-rich late-type stars. we have searched for all the possible geometric structures of SiC{n/+} radicals (n <= 5) with help of ab initio calculations (T = 0 K). Vibrational frequencies of the most stable species have then been determined . the destabilizing influence of a finite temperature effect on these structures has also been studied by using general considerations of thermal statistics. We show that for n >= 3 linear structures are energetically favored compared to the planar and three-dimensional ones. A comparison with other results published in this context is also made.

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