Observational Constraints on Circumstellar Carbon Grains

Details Observational Constraints on Circumstellar Carbon Grains Observational Constraints on Circumstellar Carbon Grains

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..309..321j&link_type=abstract

Astrophysics of Dust, ASP Conference Series, Vol. 309,Proceedings of the conference held 26-30 May, 2003 in Estes Park, Colorado

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Available observations can be used to constrain the sizes and composition of dust grains around mass-losing carbon stars. For example, around the best studied star of this class, IRC+10216, consideration of both the maps of molecules such as CN together with the map of the 2.2 {μ}m reflection nebulosity allows us to infer a particle size distribution where the particle radius is typically near 0.1 {μ}m. In contrast, in the markedly bipolar outflow around RAFGL 2688, the Egg Nebula, there are some grains as large as 0.3 cm in radius. Most of the grains in the outflows from carbon stars appear to be largely composed of carbon. Recent laboratory work suggests that graphitic onions may be an appropriate model for the structure of many of these carbon particles.

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