Statistics – Applications
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..860d&link_type=abstract
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.
Statistics
Applications
Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Giant And Subgiant Stars, Applications Of Monte Carlo Methods
Scientific paper
A large number of questions related to the C-J type carbon stars remain unanswered. The circumstellar shell of these stars is usually carbon-rich, as one would expect. Nevertheless, there is a peculiar group of C-J stars which were classified as silicon-rich C-J stars, due to their emission at 9.8 μm. This kind of emission is commonly seen in oxygen-rich stars and is connected to silicon dust grains at the circumstellar shell. Following the most established theories, the occurrence of this peculiar type of circumstellar shell around carbon-rich stars can only exist if the AGB star in question is in fact part of binary system. In this work we present an analysis of the circumstellar shell of 2 C-J stars using LRS-IRAS and T-ReCS Gemini spectra obtained in 1986 and 2007, respectively. One is a normal C-J star, namely C* 2123, and the other is a silicon-rich C-J, MC79 2-11. The joint study of the two kinds of C-J stars allows a more representative analysis of this class of stars.
de Mello Ana Beatriz
Martins Silvia Lorenz
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