Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...391..285v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 391, no. 1, May 20, 1992, p. 285-294. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
66
Asymptotic Giant Branch Stars, Carbon Stars, Stellar Envelopes, Stellar Evolution, Color-Color Diagram, Infrared Astronomy Satellite, Spectral Energy Distribution, Spectral Resolution, Stellar Spectra, Stellar Spectrophotometry
Scientific paper
A group of candidates for extreme carbon stars has been identified based on their IRAS low-resolution spectra being similar to those of AFGL 3068 and IRC +10 deg 216, which are prototypes of highly evolved carbon stars with very high mass-loss rates. Ground-based photometry has been obtained for five of these sources in order to determine the peaks of their energy distributions. All five sources have color temperatures between 300 and 500 K, and have energy distributions very similar to AFGL 3068. The observed data are fitted with radiative transfer models with optical depths at 11.3 microns ranging from 1.4 to 8. These results suggest that these stars have among the most optically thick circumstellar envelopes of all carbon stars observed to date.
Kwok Sun
Langill Philip P.
Volk Kevin
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