Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..811d&link_type=abstract
Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 811-815. Research supported by the U.S. Department of Energy
Astronomy and Astrophysics
Astrophysics
13
Convection, Cores, Helium, Nuclear Fusion, Stellar Luminosity, Stellar Models, Thermal Instability, Flash, Hydrodynamics, Hydrogen, Peculiar Stars, Radiative Transfer, Red Giant Stars, Stellar Atmospheres, Stellar Envelopes
Scientific paper
It has been proposed that helium-flash-induced convection may play a role in the production of element abundance anomalies in peculiar stars by the mixing of core or shell elements into the stellar atmosphere. The present paper considers the maximum extent of the flash-driven convective region generated by the core helium flash. It is shown that, as in the case of the shell flash, the extent of the core flash is determined by the condition that the radiative diffusion time from the outer edge of the convective region to the outer envelope be approximately equal to the growth time scale for the thermal runaway. Numerical calculations are presented which support this conclusion, and a lower limit to the maximum helium-burning luminosity needed to induce hydrogen mixing is presented. It is pointed out that the convective region may approach close enough to the hydrogen shell to mix in some hydrogen, but only if the flash is at least 1000 times as energetic as current results suggest and/or overshooting can extend the mixing.
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