Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..853s&link_type=abstract
Astrophysical Journal, vol. 204, Mar. 15, 1976, pt. 1, p. 853-868.
Astronomy and Astrophysics
Astrophysics
13
Gas Ionization, Stellar Luminosity, Stellar Models, Carbon, Convective Flow, Eddington Approximation, Mixing Length Flow Theory, Nitrogen, Opacity, Oxygen, Pulse Amplitude, Stellar Envelopes, Stellar Mass, Stellar Rotation
Scientific paper
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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