Neutral current and the onset of the helium flash

Details Neutral current and the onset of the helium flash Neutral current and the onset of the helium flash

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.176....9r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 176, July 1976, p. 9-13.

Astronomy and Astrophysics

Astronomy

28

Energy Dissipation, Neutrinos, Pair Production, Stellar Evolution, Annihilation Reactions, Astronomical Models, Helium, Stellar Structure, Stellar Temperature

Scientific paper

The effect of neutral currents on the evolution of a star of 0.9192 solar mass is investigated. It is found that under the Weinberg-Salam (1967, 1968) description of neutral-current interactions, the increased energy loss by neutrinos delays the onset of the helium flash by 590,000 yr. The core mass at the onset of helium flash is changed from 0.4576 to 0.4614 solar mass. However, a more significant change occurs in the temperature distribution inside the core; the peak of the temperature distribution shifts from 0.1504 to 0.1929 solar mass. Thus, the helium flash is triggered further away from the center than in the conventional formalism. The possible significance of this effect on mixing between the core and the envelope of the star is mentioned.

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