Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383..314e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 10, 1991, p. 314-323.
Astronomy and Astrophysics
Astronomy
27
Carbon Stars, Infrared Sources (Astronomy), Stellar Envelopes, Color-Color Diagram, Cosmic Dust, Emission Spectra, Infrared Astronomy Satellite, Interstellar Extinction, Stellar Models
Scientific paper
The emission from carbon stars with circumstellar dust shells of different structure, composition, opacity, and age was modeled with the purpose of determining the origin of the excess flux in the FIR and testing the detached shell hypotheses of Willems (1987) and Olofsson et al. (1990). Three possible sources for the excess flux were identified: (1) cool dust in a single extended shell; (2) emission from dust in the intervening interstellar medium; or (3) emission from a two-shell system in which the additional shell is a remnant from an earlier mass-loss episode. It was found that only the two-shell model with a remnant shell which is at least 1 pc thick could explain the 60- and 100-micron flux excesses seen in carbon stars with dust shells of a given opacity. Calculations of time scales for the production of the detached shells and of the carbon star lifetime were found to be consistent with the evolutionary scenario proposed by Willems.
Egan Michael P.
Leung Chun M.
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