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The Production of Low Mass Carbon Stars; Carbon-rich Dredge Up or Oxygen-rich Mass Loss?

Published online by Cambridge University Press:  12 April 2016

R.E. Stencel ,
J.E. Pesce  and
K.M. MacGregor
R.E. Stencel
Affiliation:
CASA, Univ.Colorado
J.E. Pesce
Affiliation:
CASA, Univ.Colorado
K.M. MacGregor
Affiliation:
High Altitude Observatory/NCAR

Abstract

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Conventional theory explains the origin of carbon stars as due to dredge up of carbon enriched material from the stellar core during helium flash events late in the life of solar mass AGB stars (e.g. Boothroyd and Sackmann 1988). This relatively efficient process however, seems to produce a larger C/O ratio than observed (Lambert et al. 1987). A secondary effect which could contribute to the appearance of carbon stars, is the selective removal of oxygen from the atmosphere by radiative force expulsion of oxygen rich dust grains (e.g. silicates like [Mg, Fe2SiO4]). We present calculations for this scenario which evaluate the degree of momentum coupling between the grains and gas under the thermodynamical conditions of AGB star atmospheres.

Type
3. Evolution of Peculiar Red Giant Stars
Information
International Astronomical Union Colloquium , Volume 106: Evolution of Peculiar Red Giant Stars , 1989 , pp. 229 - 231
Copyright
Copyright © Cambridge University Press 1989

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