WebThe “helium flash” occurs in a 2-solar-mass star when Answer 1. the core temperature becomes sufficiently high for helium fusion for the first time. 2. hydrogen fusion ceases abruptly, leaving only the fusion of helium to generate energy. 3. WebWhen log L / L⊙ = 3.1 and the hydrogen-exhausted core includes about 0.75 M⊙, helium burning begins at the center. Because this region is not yet degenerate, the helium flash does not occur and the burning is initiated smoothly. A central convection zone develops because of the strong temperature dependence of the triple-alpha reaction.
astrophysics - Why is the release of energy during the He-flash in ...
Web1) red giant, helium flash A2) white dwarf F3) red giant with helium burning shell B4) hydrogen fusion in shell around core I5) helium fusion in core D6) envelope ejected, planetary nebula H7) main-sequence star C8) helium used up, core collapses G9) hydrogen used up, core collapses E arrow_forward Web7 jan. 2024 · Massive stars do not undergo helium flash because they have core temperatures high enough to prevent the helium core from becoming electron-degenerate. Check here for some more information. Therefore, the star can burn helium in a smooth transition, instead of undergoing helium flash. michael berry guest today
The ten most terrifying things in the universe: helium flashes: …
Web19 okt. 2024 · The pressure-temperature thermostat regulating the star’s stability broke down as the core became degenerate. Then, finally, the degenerate core managed to … WebHelium Flash (re-stated) After H burning stops in core Core is all helium Core collapses due to loss of internal pressure (no hydrostatic eq) Collapse stopped by electron degeneracy: (10 8 kg/m 3) Note: water = 10 3 kg/m 3 Electron degeneracy results from the Pauli Exclusion Principle: No two electrons can occupy the same space WebOuter layers of AGB stars are only weakly held by gravity. The helium-burning shell is not dense enough to be degenerate so helium flashes occur with a runaway temperature … michael berry hca