A new instability during nuclear shell burning

Details A new instability during nuclear shell burning A new instability during nuclear shell burning

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124..206k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 2, Aug. 1983, p. 206-210.

Astronomy and Astrophysics

Astrophysics

Nuclear Astrophysics, Nuclear Reactions, Stellar Envelopes, Stellar Structure, Helium, Hydrogen, Stability

Scientific paper

Shell burning can be vibrationally unstable. If a mass element in a region with nuclear burning is lifted the nuclear energy generation is reduced due to the decrease of the temperature in the element. It is therefore pushed back to its original position more violently than in the case without nuclear burning. This effect sometimes can overcome the damping and can cause an overstability. With a linear stability analysis it is shown that the overstability in a helium burning shell of a 5 solar mass star can produce oscillations of a period of 0.1 s and a characteristic time of growth of 6 yr.

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