Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115..809s&link_type=abstract
Astronomical Journal, vol. 11, p. 809
Astronomy and Astrophysics
Astronomy
27
Carbon Stars, Infrared Radiation, Asymptotic Giant Branch Stars, Classifications, Infrared Astronomy Satellite
Scientific paper
We have developed a classification system for the infrared spectral emission from carbon stars using a sample of 96 bright carbon-rich variables associated with the asymptotic giant branch. In addition to the stellar contribution, most spectra include the 11.2 micron emission feature from SiC and either a smooth, cool continuum from amorphous carbon or a secondary emission feature at 9.0 microns. We have identified a carbon-rich dust sequence along which the amorphous carbon component grows while the 9.0 micron feature declines in strength. Along this spectral sequence, the proportion of Mira variables increases, as does the period of variability, the mass-loss rate, and the thickness of the circumstellar shell. Thus the carbon-rich dust sequence appears to be an evolutionary sequence. One class of spectra shows a particularly strong 9.0 micron feature, enhanced C/O ratio, and several other unusual properties that suggest a different sequence, perhaps related to J stars.
Little-Marenin Irene R.
Price Stephan D.
Sloan Greg C.
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