Astronomy and Astrophysics – Astronomy
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179..417c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 179, May 1977, p. 417-432.
Astronomy and Astrophysics
Astronomy
9
Abundance, Calcium Chlorides, Carbon Stars, Cool Stars, Stellar Spectra, Stellar Temperature, Atmospheric Composition, Iterative Solution, Mass Ratios, Newton-Raphson Method, Stellar Atmospheres
Scientific paper
Observations of CaCl bands in spectra of carbon stars are discussed, and a list of all 29 stars known to exhibit CaCl features is presented. The dissociation equilibrium of 20 elements (including 105 molecules) is calculated for C/O ratios ranging from 0.6 to 1.6 by a Newton-Raphson iteration, and changes in CaCl concentration in stellar atmospheres are examined as a function of temperature, pressure, and C/O ratio. It is found that CaCl concentration is a strong function of temperature, a strong function of pressure at higher temperatures, and essentially independent of C/O ratio when that ratio exceeds 0.98. An attempt is made to determine whether unusual abundances could cause the varying strengths of CaCl bands in cool stars. Five mechanisms are considered which might explain the presence of CaCl bands in spectra of SC and mild carbon stars together with the probable absence of these bands in spectra of M, S, and strong carbon stars.
Clegg Richard
Wyckoff Susan
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