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- Convection_zone abstract "The convection zone of a star is the range of radii in which energy is transported primarily by convection. In the radiation zone, energy is transported by radiation.Stellar convection consists of mass movement of plasma within the star which usually forms a circular convection current with the heated plasma ascending and the cooled plasma descending. The convection zone and the radiation zone are divided by the tachocline.The Schwarzschild criterion expresses the conditions under which a region of a star is unstable to convection. A parcel of gas that rises slightly will find itself in an environment of lower pressure than the one it came from. As a result, the parcel will expand and cool. If the rising parcel cools to a lower temperature than its new surroundings, so that it has a higher density than the surrounding gas, then its lack of buoyancy will cause it to sink back to where it came from. However, if the temperature gradient is steep enough (i. e. the temperature changes rapidly with distance from the center of the star), or if the gas has a very high heat capacity (i. e. its temperature changes relatively slowly as it expands) then the rising parcel of gas will remain warmer and less dense than its new surroundings even after expanding and cooling. Its buoyancy will then cause it to continue to rise. The region of the star in which this happens is the convection zone.In stars more than 1.3 times the mass of the Sun, the high core temperature causes nuclear fusion of hydrogen into helium to occur predominantly via the carbon-nitrogen-oxygen (CNO) cycle instead of the less temperature-sensitive proton-proton chain. The high temperature gradient in the core region forms a convection zone that uniformly mixes the hydrogen fuel with the helium product. The core convection zone of these stars is overlaid by a radiation zone that is in thermal equilibrium and undergoes little or no mixing. In the most massive stars, the convection zone may reach all the way from the core to the surface.In stars of less than about 10 solar masses, the outer envelope of the star contains a region where partial ionization of hydrogen and helium raises the heat capacity. The relatively low temperature in this region simultaneously causes the opacity due to heavier elements to be high enough to produce a steep temperature gradient. This combination of circumstances produces an outer convection zone, the top of which is visible in the Sun as solar granulation. Low mass main sequences of stars, such as red dwarfs below 0.35 solar masses, as well as pre-main sequence stars on the Hayashi track, are convective throughout and do not contain a radiation zone.In red giant stars, and particularly during the asymptotic giant branch phase, the surface convection zone varies in depth during the phases of shell burning. This causes dredge-up events, short-lived very deep convection zones that transport fusion products to the surface of the star.".
- Convection_zone thumbnail Sun_poster.svg?width=300.
- Convection_zone wikiPageExternalLink convectiontempden.
- Convection_zone wikiPageExternalLink convectionzone.
- Convection_zone wikiPageID "1235959".
- Convection_zone wikiPageLength "5105".
- Convection_zone wikiPageOutDegree "31".
- Convection_zone wikiPageRevisionID "671908150".
- Convection_zone wikiPageWikiLink Asymptotic_giant_branch.
- Convection_zone wikiPageWikiLink CNO_cycle.
- Convection_zone wikiPageWikiLink Category:Convection.
- Convection_zone wikiPageWikiLink Convection.
- Convection_zone wikiPageWikiLink Convection_zone.
- Convection_zone wikiPageWikiLink Dredge-up.
- Convection_zone wikiPageWikiLink Gradient.
- Convection_zone wikiPageWikiLink Granule_(solar_physics).
- Convection_zone wikiPageWikiLink Hayashi_track.
- Convection_zone wikiPageWikiLink Heat_capacity.
- Convection_zone wikiPageWikiLink Helium.
- Convection_zone wikiPageWikiLink Hydrogen.
- Convection_zone wikiPageWikiLink Ionization.
- Convection_zone wikiPageWikiLink Nuclear_fusion.
- Convection_zone wikiPageWikiLink Opacity_(optics).
- Convection_zone wikiPageWikiLink Proton-proton_chain.
- Convection_zone wikiPageWikiLink Proton–proton_chain_reaction.
- Convection_zone wikiPageWikiLink Radiation_zone.
- Convection_zone wikiPageWikiLink Radii.
- Convection_zone wikiPageWikiLink Radius.
- Convection_zone wikiPageWikiLink Red_dwarf.
- Convection_zone wikiPageWikiLink Red_giant.
- Convection_zone wikiPageWikiLink Red_giant_star.
- Convection_zone wikiPageWikiLink Schwarzschild_criterion.
- Convection_zone wikiPageWikiLink Solar_mass.
- Convection_zone wikiPageWikiLink Star.
- Convection_zone wikiPageWikiLink Tachocline.
- Convection_zone wikiPageWikiLink Temperature.
- Convection_zone wikiPageWikiLink File:Structure_of_Stars_(artist’s_impression).jpg.
- Convection_zone wikiPageWikiLink File:Sun_poster.svg.
- Convection_zone wikiPageWikiLinkText "Convection zone".
- Convection_zone wikiPageWikiLinkText "convection zone".
- Convection_zone wikiPageWikiLinkText "convection".
- Convection_zone wikiPageWikiLinkText "convective zone".
- Convection_zone wikiPageWikiLinkText "convective".
- Convection_zone wikiPageWikiLinkText "fully convective".
- Convection_zone wikiPageWikiLinkText "plasma convection".
- Convection_zone hasPhotoCollection Convection_zone.
- Convection_zone wikiPageUsesTemplate Template:Cite_book.
- Convection_zone wikiPageUsesTemplate Template:Reflist.
- Convection_zone wikiPageUsesTemplate Template:Star.
- Convection_zone wikiPageUsesTemplate Template:The_Sun.
- Convection_zone subject Category:Convection.
- Convection_zone hypernym Range.
- Convection_zone type Dynamic.
- Convection_zone comment "The convection zone of a star is the range of radii in which energy is transported primarily by convection. In the radiation zone, energy is transported by radiation.Stellar convection consists of mass movement of plasma within the star which usually forms a circular convection current with the heated plasma ascending and the cooled plasma descending.".
- Convection_zone label "Convection zone".
- Convection_zone sameAs Канвектыўная_зона.
- Convection_zone sameAs Zona_de_convecció.
- Convection_zone sameAs Konvektivní_zóna.
- Convection_zone sameAs Zona_convectiva.
- Convection_zone sameAs ناحیه_همرفتی.
- Convection_zone sameAs Zona_konveksi.
- Convection_zone sameAs Zona_convettiva.
- Convection_zone sameAs 対流層.
- Convection_zone sameAs 대류층.
- Convection_zone sameAs Konveksjonssone.
- Convection_zone sameAs Strefa_konwektywna.
- Convection_zone sameAs Zona_de_convecção.
- Convection_zone sameAs m.04kz37.
- Convection_zone sameAs Zonă_convectivă.
- Convection_zone sameAs Конвективная_зона.
- Convection_zone sameAs Konvektívna_zóna.
- Convection_zone sameAs Konvektivna_zona.
- Convection_zone sameAs เขตพาความร้อน.
- Convection_zone sameAs Isıyayımsal_bölge.
- Convection_zone sameAs Q128034.
- Convection_zone sameAs Q128034.
- Convection_zone sameAs 對流層_(恆星).
- Convection_zone wasDerivedFrom Convection_zone?oldid=671908150.
- Convection_zone depiction Sun_poster.svg.
- Convection_zone isPrimaryTopicOf Convection_zone.