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- Helium_flash abstract "A helium flash is a very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the triple-alpha process in the core of low mass stars (between 0.8 solar masses (M☉) and 2.0 M☉) during their red giant phase (the Sun is predicted to experience a flash 1.2 billion years after it leaves the main sequence). A much rarer runaway helium fusion process can also occur on the surface of accreting white dwarf stars. Due to the inability of these low mass stars to counter the pressure of gravity by fusing helium when the hydrogen in the core is exhausted, eventually a flash of very intense helium fusion (or burning) occurs because the accumulation of helium which has become degenerate matter has reached a certain percentage of the total helium in the core where it is supported against gravitational collapse by quantum mechanical pressure rather than thermal pressure. This process causes an increase in the temperature and density of the core which then finally does undergo helium burning when the core reaches 100 million kelvin but at a tremendous rate because this burning does not act to expand the matter against the pressure of gravity and hence cool it (as does happen in main sequence stars which burn too much hydrogen) because it is degenerate, and a fundamental quality of degenerate matter is that changes in temperature will not affect the volume of the mass, and thus there is no regulation of the rate of fusion through hydrostatic equilibrium. The very high density speeds up the fusion rate until there is a runaway nuclear reaction which lasts a few minutes and which briefly emits energy at a rate comparable to the whole Milky Way. In the case of normal low mass stars, the energy is absorbed by the star and thus is undetected by observation and is solely described by astrophysical models. The process ends when the material is heated to the point where thermal pressure again becomes dominant, and the material then expands and cools. It is estimated that the electron-degenerate helium core weighs about 40% of the star mass and that 6% of the core is converted into carbon.".
- Helium_flash thumbnail Helium_flash.svg?width=300.
- Helium_flash wikiPageID "507854".
- Helium_flash wikiPageLength "10073".
- Helium_flash wikiPageOutDegree "38".
- Helium_flash wikiPageRevisionID "683052954".
- Helium_flash wikiPageWikiLink Accretion_(astrophysics).
- Helium_flash wikiPageWikiLink Asymptotic_giant_branch.
- Helium_flash wikiPageWikiLink Carbon.
- Helium_flash wikiPageWikiLink Carbon_detonation.
- Helium_flash wikiPageWikiLink Category:Astrophysics.
- Helium_flash wikiPageWikiLink Category:Stellar_evolution.
- Helium_flash wikiPageWikiLink Degenerate_matter.
- Helium_flash wikiPageWikiLink Gravitational_collapse.
- Helium_flash wikiPageWikiLink Gravity.
- Helium_flash wikiPageWikiLink Helium.
- Helium_flash wikiPageWikiLink Hydrostatic_equilibrium.
- Helium_flash wikiPageWikiLink Ideal_gas_law.
- Helium_flash wikiPageWikiLink Kelvin.
- Helium_flash wikiPageWikiLink Main_sequence.
- Helium_flash wikiPageWikiLink Milky_Way.
- Helium_flash wikiPageWikiLink Nova.
- Helium_flash wikiPageWikiLink Nuclear_fusion.
- Helium_flash wikiPageWikiLink Quantum_mechanics.
- Helium_flash wikiPageWikiLink Red_giant.
- Helium_flash wikiPageWikiLink Solar_mass.
- Helium_flash wikiPageWikiLink Star.
- Helium_flash wikiPageWikiLink Stellar_evolution.
- Helium_flash wikiPageWikiLink Sun.
- Helium_flash wikiPageWikiLink Temperature.
- Helium_flash wikiPageWikiLink Thermal_conduction.
- Helium_flash wikiPageWikiLink Thermal_runaway.
- Helium_flash wikiPageWikiLink Triple-alpha_process.
- Helium_flash wikiPageWikiLink White_dwarf.
- Helium_flash wikiPageWikiLink X-ray_burster.
- Helium_flash wikiPageWikiLink File:Helium_flash.svg.
- Helium_flash wikiPageWikiLink File:White_Dwarf_Resurrection.jpg.
- Helium_flash wikiPageWikiLinkText "Helium flash".
- Helium_flash wikiPageWikiLinkText "core helium flash".
- Helium_flash wikiPageWikiLinkText "flash".
- Helium_flash wikiPageWikiLinkText "helium core flash".
- Helium_flash wikiPageWikiLinkText "helium flash".
- Helium_flash wikiPageWikiLinkText "helium shell flash".
- Helium_flash wikiPageWikiLinkText "shell helium flash".
- Helium_flash wikiPageWikiLinkText "starting with helium flash".
- Helium_flash hasPhotoCollection Helium_flash.
- Helium_flash wikiPageUsesTemplate Template:Anchor.
- Helium_flash wikiPageUsesTemplate Template:Solar_mass.
- Helium_flash wikiPageUsesTemplate Template:Star.
- Helium_flash wikiPageUsesTemplate Template:Val.
- Helium_flash wikiPageUsesTemplate Template:White_dwarf.
- Helium_flash subject Category:Astrophysics.
- Helium_flash subject Category:Stellar_evolution.
- Helium_flash type Astrophysic.
- Helium_flash type Sub-discipline.
- Helium_flash comment "A helium flash is a very brief thermal runaway nuclear fusion of large quantities of helium into carbon through the triple-alpha process in the core of low mass stars (between 0.8 solar masses (M☉) and 2.0 M☉) during their red giant phase (the Sun is predicted to experience a flash 1.2 billion years after it leaves the main sequence). A much rarer runaway helium fusion process can also occur on the surface of accreting white dwarf stars.".
- Helium_flash label "Helium flash".
- Helium_flash sameAs وميض_هيليوم.
- Helium_flash sameAs হিলিয়াম_ঝলক.
- Helium_flash sameAs Flaix_de_lheli.
- Helium_flash sameAs Heliový_záblesk.
- Helium_flash sameAs Helium-Blitz.
- Helium_flash sameAs Flash_del_helio.
- Helium_flash sameAs Heliumleimahdus.
- Helium_flash sameAs Flash_de_lhxc3xa9lium.
- Helium_flash sameAs הבזק_הליום.
- Helium_flash sameAs Flash_dellelio.
- Helium_flash sameAs ヘリウムフラッシュ.
- Helium_flash sameAs 헬륨섬광.
- Helium_flash sameAs ഹീലിയം_ഫ്ലാഷ്.
- Helium_flash sameAs Heliumflits.
- Helium_flash sameAs Błysk_helowy.
- Helium_flash sameAs Flash_de_hélio.
- Helium_flash sameAs m.02jqgn.
- Helium_flash sameAs Гелиевая_вспышка.
- Helium_flash sameAs Héliový_záblesk.
- Helium_flash sameAs Heliumflash.
- Helium_flash sameAs Спалах_гелієвого_ядра.
- Helium_flash sameAs Q865098.
- Helium_flash sameAs Q865098.
- Helium_flash sameAs 氦閃.
- Helium_flash wasDerivedFrom Helium_flash?oldid=683052954.
- Helium_flash depiction Helium_flash.svg.
- Helium_flash isPrimaryTopicOf Helium_flash.