Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981acaps...1...51h&link_type=abstract
(Acta Astrophysica Sinica, vol. 1, 1981, p. 51-57.) Chinese Astronomy and Astrophysics, vol. 5, June 1981, p. 217-222. Translati
Astronomy and Astrophysics
Astrophysics
Carbon Isotopes, Nitrogen Isotopes, Nonequilibrium Thermodynamics, Oxygen Isotopes, Stellar Structure, Thermodynamic Cycles, Abundance, Convection, Diffusion, Entropy, Temperature Effects, Thermodynamic Equilibrium
Scientific paper
On the basis of Prigogine's stability criterion of excess entropy production in nonlinear and nonequilibrium thermodynamics for such a system, the stability of stars at the upper part of the main sequence is studied. Here, the C-N-O cycle is the principal energy source. It is assumed that the star is in hydrostatic equilibrium, that the temperature in the region of nuclear reaction is constant, and that convection and diffusion are unimportant. Five conditions for stability are obtained, the first three being satisfied for a star. The other two, however, are contradictory. The thermodynamic system is therefore unstable. Reasons for the contradiction are adduced, and it is shown that convection, diffusion, temperature variation and the cycle reactions other than the C-N-O cycle must be considered.
He Xian-Tu
Huang Ke-Liang
Peng Qiu He
Wang Zhi-Yong
Zhan Ken-Hua
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