Stothers 1976

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

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

Stothers, R. (1976), Excitation of pulsations in the CNO ionization zone of luminous stars, Astrophys. J., 204, 853-868.

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

Stothers, R. 1976, Astrophys. J., 204, 853.

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

R. Stothers, Astrophys. J. 204, 853-868 (1976).