The variation of the CNO abundances in massive binary systems - an application to Wolf-Rayet stars

Details The variation of the CNO abundances in massive binary systems - an application to Wolf-Rayet stars The variation of the CNO abundances in massive binary systems - an application to Wolf-Rayet stars

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87...77v&link_type=abstract

Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 77-79.

Astronomy and Astrophysics

Astrophysics

15

Abundance, Binary Stars, Carbon Isotopes, Hot Stars, Nitrogen Isotopes, Oxygen Isotopes, Stellar Evolution, Supermassive Stars, Wolf-Rayet Stars, Hydrogen, Roche Limit, Stellar Interiors, Stellar Luminosity, Stellar Mass Ejection, Stellar Winds

Scientific paper

The evolution of the CNO isotopes in stellar interiors is computed for stars of 40, 60, and 100 solar masses considered as primaries of close binaries. During core hydrogen burning stellar wind mass loss is taken into account. The spread of the surface CNO abundances for the remnant stars after Roche lobe overflow is very small if different stellar masses are considered. As this stage may account for the late type WN stage, this result indicates that the CNO abundances should not be largely dependent on mass and luminosity for this type of stars. Further mass loss by stellar wind strips off the remaining hydrogen. The stage when pure (He, metal) layers appear at the surface corresponds with the early WN stars. Again the spread of the surface CNO abundances is very small. A comparison of the observed N/C ratio with the theoretical predictions for early WN stars reveals a difference of at least a factor of four.

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