IRAS low-resolution spectra of cool carbon stars. II - Stars with thin circumstellar shells. III - Stars with thick circumstellar shells

Details IRAS low-resolution spectra of cool carbon stars. II - Stars with thin circumstellar shells. III - Stars with thick circumstellar shells IRAS low-resolution spectra of cool carbon stars. II - Stars with thin circumstellar shells. III - Stars with thick circumstellar shells

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...203...51w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 203, no. 1, Sept. 1988, p. 51-70. ASTRON-supported research.

Astronomy and Astrophysics

Astronomy

36

Carbon Stars, Cool Stars, Infrared Astronomy, Late Stars, Stellar Evolution, Infrared Astronomy Satellite, Near Infrared Radiation, Stellar Envelopes, Stellar Temperature

Scientific paper

IRAS low-resolution spectra and broad-band data and near-IR photometry are analyzed for 72 carbon stars with near-IR color temperatures over 2000 K. Seven stars have an almost featureless spectrum without dust emission in the LRS wavelength region. The majority of the sample stars have the 11.5 micron SiC and an unidentified 8.6 micron emission feature superposed on the stellar continuum. The strength of the latter feature correlates with the strength of the 3 micron absorption band and is probably of molecular origin. The broad-band data exhibit a 60 micron excess which is ascribed to a cool dust shell. The IR spectral energy distributions of those stars with thick circumstellar shells are analyzed. The slope of the far-IR flux can best be explained by the existence of a well-defined outer boundary of the dust shell. The temperature at this outer boundary implies that the present high mass loss rate started 100-1000 yr ago.

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