Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-05-11
Astronomy and Astrophysics
Astrophysics
16 pages, AAS LaTex, in press, Astrophysical Journal, September 20, Vol 523
Scientific paper
10.1086/307715
The previous analysis of the convective Urca neutrino loss process in degenerate, convective, quasi-static, carbon-burning cores by Barkat and Wheeler omitted specific consideration of the role of the kinetic energy flux. The arguments of Barkat and Wheeler that steady-state composition gradients exist are correct, but chemical equilibrium does not result in net cooling. Barkat and Wheeler included a "work" term that effectively removed energy from the total energy budget that could only have come from the kinetic energy, which must remain positive. Consideration of the kinetic energy in the thermodynamics of the convective Urca process shows that the convective Urca neutrinos reduce the rate of increase of entropy that would otherwise be associated with the input of nuclear energy and slow down the convective current, but, unlike the "thermal" Urca process do not reduce the entropy or temperature.
Barkat Zalman
Stein John
Wheeler Justin C.
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