Evolution of infrared carbon stars

Details Evolution of infrared carbon stars Evolution of infrared carbon stars

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237..354c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 2, Oct. 1990, p. 354-368. Research supported by NSERC.

Astronomy and Astrophysics

Astronomy

81

Carbon Stars, Infrared Stars, Stellar Evolution, Color-Color Diagram, Cosmic Dust, Infrared Astronomy Satellite, Spectral Energy Distribution, Stellar Models

Scientific paper

The paper presents model calculations on the evolution from visual carbon stars to infrared carbon stars by using a sample of 472 infrared carbon stars from the IRAS low resolution spectra. The selection of the sample based on the presence of an SiC feature is discussed. A new empirical opacity function for the SiC grain is derived, and it is noted that since many infrared carbon stars have optically-thick dust envelopes, a full radiative transfer calculation is necessary. The new SiC opacity function is used to calculate the emergent spectra of infrared carbon stars as they ascend the asymptotic giant branch (AGB) with increasing mass-loss rates. The observed energy distribution of 395 infrared carbon stars are then fitted with the model. It is suggested that there is a branching of M and C stars on the AGB with each branch evolving independently to the planetary nebula stage.

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