Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-12-08
Astronomy and Astrophysics
Astrophysics
Accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20000411
A set of 45 dust envelopes of carbon stars has been modeled. Among them, 34 were selected according to their dust envelope class (as suggested by Sloan, Little-Marenin & Price, 1998) and 11 are extreme carbon stars. The models were performed using a code that describes the radiative transfer in dust envelopes considering core/mantle grains composed by an alpha-SiC core and an amorphous carbon (A.C.) mantle. In addition, we have also computed models with a code that considers two kinds of grains - alpha-SiC and A.C. - simultaneously. Core-mantle grains seem to fit dust envelopes of evolved carbon stars, while two homogeneous grains are more able to reproduce thinner dust envelopes. Our results suggest that there exists an evolution of dust grains in the carbon star sequence. In the beginning of the sequence, grains are mainly composed of SiC and amorphous carbon; with dust envelope evolution, carbon grains are coated in SiC. This phenomena could perhaps explain the small quantity of SiC grains observed in the interstellar medium. However, in this work we consider only alpha-SiC grains, and the inclusion of beta-SiC grains can perhaps change some of there results.
Codina Landaberry Sayd Jose
de Almeida W. G.
de Araújo Francisco Xavier
de Nader R. V.
Lorenz-Martins Silvia
No associations
LandOfFree
Modeling of C stars with core/mantle grains: Amorphous carbon + SiC 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 Modeling of C stars with core/mantle grains: Amorphous carbon + SiC, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling of C stars with core/mantle grains: Amorphous carbon + SiC will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-644647