A comparison of photospheric and circumstellar (HCN)/(CO)-ratios for bright carbon stars

Details A comparison of photospheric and circumstellar (HCN)/(CO)-ratios for bright carbon stars A comparison of photospheric and circumstellar (HCN)/(CO)-ratios for bright carbon stars

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..405o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 405-411.

Astronomy and Astrophysics

Astrophysics

34

Carbon Monoxide, Carbon Stars, Hydrocyanic Acid, Interstellar Matter, Stellar Luminosity, Abundance, Emission Spectra, Photosphere, Radio Emission, Stellar Mass Ejection, Stars: Abundances, Stars: Carbon, Circumstellar Matter, Mass Loss, Radio Lines: Molecular

Scientific paper

Measures of circumstellar HCN/CO abundance ratios for carbon stars are compared with corresponding ratios estimated from photospheric abundance analysis. A satisfactory agreement is found for most stars. However, V Hya and two 60 μm-excess sources have significantly lower circumstellar ratios than expected, and for the 13C-rich stars the ratios are somewhat higher.

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