Publication Abstracts

Stothers 1976

Stothers, R., 1976: Excitation of pulsations in the CNO ionization zone of luminous stars. Astrophys. J., 204, 853-868, doi:10.1086/154234.

Homogeneous models of luminous hydrogen-and-helium burning stars were constructed on the basis of Carson's new radiative opacities. These opacities exhibit a large 'bump' at moderate temperatures and low densities as a result of the ultimate ionization of the CNO group of elements and they induce in the envelopes of the more massive stars a strong local convection zone, a high central condensation and pulsational instability by means of the kappa-mechanism above a certain stellar mass. This critical mass for Population I hydrogen-burning stars is probably greater than 45 solar masses for the fundamental radial mode, with the overtones being more stable, while for the homogeneous helium-burning stars, the critical mass lies in the range 2-6 solar masses for all modes up to at least the third overtone. Convection is alternately treated by means of the mixing length theory and the assumption of strict adiabaticity.

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BibTeX Citation

@article{st07300k,
  author={Stothers, R.},
  title={Excitation of pulsations in the CNO ionization zone of luminous stars},
  year={1976},
  journal={Astrophys. J.},
  volume={204},
  pages={853--868},
  doi={10.1086/154234},
}

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RIS Citation

TY  - JOUR
ID  - st07300k
AU  - Stothers, R.
PY  - 1976
TI  - Excitation of pulsations in the CNO ionization zone of luminous stars
JA  - Astrophys. J.
VL  - 204
SP  - 853
EP  - 868
DO  - 10.1086/154234
ER  -

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