Helium Flash The onset of runaway helium burning under degenerate conditions. The helium flashoccurs in the hydrogen-exhausted core of a starin the red-giant phase of evolution. The explosive start of nuclear reactions converting helium into carbonin the core of an aging star.
Färgglada heliumballonger på flash radiella linjer - Illustration Bunches and groups of colored helium balloons isolated on on flash radial lines background.
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Helium Flash. The explosive ignition of helium burning (accompanying electron degeneracy) which occurs in some giant stars. © 1996-2007 Eric W. Weisstein.
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The helium flash happens in the hydrogen-exhausted core of a star that has become a red giant.When gravitational pressure has raised the temperature of the dormant helium core to a temperature of about 100 million K, the helium nuclei start to undergo thermonuclear reactions. 2021-03-16 When helium ignites degenerately, it does so in a thermonu-clear runaway, called the \Helium Flash".
Helium Flash The onset of runaway helium burning under degenerate conditions. The helium flashoccurs in the hydrogen-exhausted core of a starin the red-giant phase of evolution. The explosive start of nuclear reactions converting helium into carbonin the core of an aging star. A helium flash occurs because the core of the star is in what is known as a "degenerate" state. This means that the core has contracted so much that the pressure of the electron shells of the atoms
The helium flash is also over very quickly. In a matter of seconds, the core becomes hot enough that it is no longer degenerate. The pressure-temperature thermostat is able to kick back in.
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B) helium burning ceases in the core, but hydrogen burning continues in the layers around the core. C) helium burning begins in the core, and hydrogen burning ceases in the layers around the core. D) helium burning begins in the core, and hydrogen burning continues in the layers around the core.
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