Carbon stars and circumstellar shells. I - Infrared observations and evidence for grain emission

Details Carbon stars and circumstellar shells. I - Infrared observations and evidence for grain emission Carbon stars and circumstellar shells. I - Infrared observations and evidence for grain emission

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....52..227b&link_type=abstract

Astronomy and Astrophysics, vol. 52, no. 2, Oct. 1976, p. 227-244.

Astronomy and Astrophysics

Astronomy

46

Carbon Stars, Infrared Stars, Stellar Envelopes, Stellar Spectrophotometry, Cosmic Dust, Infrared Astronomy, Irregular Variable Stars, Near Infrared Radiation, Semiregular Variable Stars, Stellar Models, Stellar Temperature

Scientific paper

Spectral energy distributions of 29 carbon stars are studied using available near-IR photometric observations. The present sample includes several Mira-type variables, semiregular variables, and irregular variables. Absolute fluxes are calculated for wavelengths in the range from 0.36 to 20.0 microns, mean color temperatures are determined, and observed outward fluxes are compared with computations from model atmospheres. Theoretical CO depth parameters are compared with synthetic spectra round 2.3 microns, major opacity sources are examined, and the behavior of CN opacity is investigated. Analysis of the spectral data indicates that CN, C2, and C3 band intensities increase together; that CO band intensities are inversely correlated with those of other carbon compounds; and that variations in gas opacity are unlikely to explain the observed IR excesses. The data are shown to support the hypothesis of strong thermal emission from hot grains.

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