Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235l...5l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. L5-L8.
Astronomy and Astrophysics
Astrophysics
18
Carbon Stars, Oxygen, Stellar Envelopes, Stellar Spectrophotometry, Astrometry, Spectral Energy Distribution, Stellar Models, Water Masers
Scientific paper
Astrometric, spectroscopic, and photometric data on the five known southern carbon stars associated with an oxygen-rich circumstellar envelope are presented. CS2123 is shown to be incorrectly identified with IRAS13442-6109. CS1633 is shown to have been incorrectly classified as a carbon-rich star (in fact, spectral type M7111). The 1-60-micron energy distributions of the three remaining objects (CS1003, MC79-11, FJF270) are clearly bimodal. The observed energy distributions might be reproduced by the model of a detached oxygen-rich shell surrounding a carbon star, but with rather extreme parameters implying, for the central star, a short transition time from the oxygen-rich stage to the carbon-rich stage (less than 100 years). On another hand, the data are not in conflict with the binary star model for these three sources.
Bertre Th. Le
Deguchi Shigeki
Nakada Yoshikazu
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