Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..37..143r&link_type=abstract
Astrophysics and Space Science, vol. 37, Oct. 1975, p. 143-150. Research supported by the Commission for Basic Research of Israe
Astronomy and Astrophysics
Astrophysics
4
Beta Particles, Electron Capture, Free Convection, Particle Interactions, Plasma Decay, Capture Effect, Free Electrons, Perturbation, Schwarzschild Metric, Stellar Evolution, Stellar Mass, Systems Stability, Thermal Energy
Scientific paper
The effect of the URCA process (beta-decay, electron capture) on local convective stability in evolved stars of 3.5 to 8 solar masses with highly degenerate carbon-oxygen cores is investigated. A stability criterion is derived which contains the Schwarzschild criterion and the thermohaline condition for stability. Local stability analysis indicates that the URCA process may cause convective instability in an otherwise stable medium but cannot stabilize an already unstable medium. A numerical example for the Na-23-Ne-23 URCA pair is presented which shows the regions in the density-temperature plane where instability is induced. It is concluded that convective regions may be formed by an URCA shell even before C-12 ignition.
Regev Oded
Shaviv Giora
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