Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372..208j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 1, 1991, p. 208-214. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
13
Abundance, Carbon Stars, Nitrogen, Planetary Nebulae, Stellar Evolution, Molecular Excitation, Radio Emission, Stellar Mass Ejection
Scientific paper
Published data for carbon stars losing more than 10 to the -6th solar mass/yr in the neighborhood of the sun are examined. The stars with higher terminal velocities have significantly higher fluxes of the J = 1-0 emission line of HCN relative to their infrared continuum emission at 60 microns. It is argued that this result is probably a reflection of a higher nitrogen abundance by perhaps a factor of 10 in these outflows. Such a high nitrogen abundance is consistent with the hypothesis that the high terminal velocity carbon stars have more massive main-sequence progenitors than average; these high terminal velocity carbon stars may, themselves, be the progenitors of type I planetary nebulae which display enhanced nitrogen abundances.
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