Mixing between Stellar Envelope and Core in Advanced Phases of Evolution. I ---General Treatment and Brief Summary of Results---

Details Mixing between Stellar Envelope and Core in Advanced Phases of Evolution. I ---General Treatment and Brief Summary of Results--- Mixing between Stellar Envelope and Core in Advanced Phases of Evolution. I ---General Treatment and Brief Summary of Results---

Aug 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970pthph..44..375s&link_type=abstract

Progress of Theoretical Physics, Vol. 44, No. 2, pp. 375-388

Physics

24

Scientific paper

Stellar structure in very advanced phases of evolution is discussed, taking into account the hydrogen-rich envelope. The star is divided into the envelope and the core. It is shown that the envelope with an extended surface-convection zone can be replaced, to a good approximation, by suitable boundary conditions at the outer edge of the core. Computing evolution of the core with these boundary conditions, we can discuss mixing between the stellar core and envelope through a deepening surface convection zone; the condition for the mixing is formulated as an entropy condition at the edge of the core. Simplified model of the core is studied to understand how the mixing proceeds in the very advanced phases of evolution. Detailed numerical computation has been made for the stars of masses about 30 and 12 M&sun; through oxygen-burning phase, and for the star of mass about 6M_&sun; through the phase of carbon-shell burning. In the present paper, however, we give physical data used in this series of studies, and only a brief summary of numerical results. The detailed results will be given in papers II and III of this series.

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