The Nature and Evolution of Silicon Carbide in the Outflows of Carbon Stars

Details The Nature and Evolution of Silicon Carbide in the Outflows of Carbon Stars The Nature and Evolution of Silicon Carbide in the Outflows of Carbon Stars

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.0605t&link_type=abstract

American Astronomical Society Meeting 206, #06.05; Bulletin of the American Astronomical Society, Vol. 37, p.436

Astronomy and Astrophysics

Astronomy

Scientific paper

It has been known for more than three decades that dust particles form in the atmospheres of cool stars and are ejected into the interstellar medium. In this context there has been a great deal of observational, theoretical and laboratory studies of silicon carbide (SiC).
Theoretically SiC is expected to form in the outflows of carbon stars and has indeed been observed in the form of an 11.3um feature in the mid-IR spectrum of such stars. SiC has also been found in meteorites, and from isotopic studies, many of these grains are believed to have formed around carbon stars. Results from the study of these presolar meteoritic SiC grains suggest that the nature of the SiC forming in carbon star outflows changes as the star evolves. Theory predicts that the abundance of s-process elements in the atmospheres of such a star should increase as the star evolves. It has been shown that the smaller presolar SiC grains contain a higher abundance of s-process elements, suggesting that grain formation initially produces relatively large grains, and that the grains formed are progressively smaller as the star evolves. We present observational evidence that confirms this suggestion and discuss the meaning of the change in grain size with stellar evolution.

Affiliated with

Also associated with

No associations

Rating

The Nature and Evolution of Silicon Carbide in the Outflows of Carbon Stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Nature and Evolution of Silicon Carbide in the Outflows of Carbon Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Nature and Evolution of Silicon Carbide in the Outflows of Carbon Stars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1683641