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- Dredge-up abstract "A dredge-up is a period in the evolution of a star where a surface convection zone extends down to the layers where material has undergone nuclear fusion. As a result, the fusion products are mixed into the outer layers of the stellar atmosphere where they can appear in the spectrum of the star.The first dredge-up occurs when a main-sequence star enters the red-giant branch. As a result of the convective mixing, the outer atmosphere will display the spectral signature of hydrogen fusion: the 12C/13C and C/N ratios are lowered, and the surface abundances of lithium and beryllium may be reduced.The second dredge-up occurs in stars with 4–8 solar masses. When helium fusion comes to an end at the core, convection mixes the products of the CNO cycle. This second dredge-up results in an increase in the surface abundance of 4He and 14N, whereas the amount of 12C and 16O decreases.The third dredge-up occurs after a star enters the asymptotic giant branch and a flash occurs along a helium burning shell. This dredge-up causes helium, carbon and the s-process products to be brought to the surface. The result is an increase in the abundance of carbon relative to oxygen, which can create a carbon star.The names of the dredge-ups are set by the evolutionary and structural state of the star in which each occurs, not by the sequence experienced by the star. As a result, lower-mass stars experience the first and third dredge-ups in their evolution but not the second.".
- Dredge-up wikiPageID "25480269".
- Dredge-up wikiPageLength "2374".
- Dredge-up wikiPageOutDegree "22".
- Dredge-up wikiPageRevisionID "632534848".
- Dredge-up wikiPageWikiLink Astronomical_spectroscopy.
- Dredge-up wikiPageWikiLink Asymptotic_giant_branch.
- Dredge-up wikiPageWikiLink Beryllium.
- Dredge-up wikiPageWikiLink CNO_cycle.
- Dredge-up wikiPageWikiLink Carbon.
- Dredge-up wikiPageWikiLink Carbon-12.
- Dredge-up wikiPageWikiLink Carbon-13.
- Dredge-up wikiPageWikiLink Carbon_star.
- Dredge-up wikiPageWikiLink Category:Stellar_evolution.
- Dredge-up wikiPageWikiLink Convection_zone.
- Dredge-up wikiPageWikiLink Helium.
- Dredge-up wikiPageWikiLink Helium_flash.
- Dredge-up wikiPageWikiLink Hydrogen.
- Dredge-up wikiPageWikiLink Lithium.
- Dredge-up wikiPageWikiLink Main_sequence.
- Dredge-up wikiPageWikiLink Nitrogen.
- Dredge-up wikiPageWikiLink Red_giant.
- Dredge-up wikiPageWikiLink S-process.
- Dredge-up wikiPageWikiLink Solar_mass.
- Dredge-up wikiPageWikiLink Star.
- Dredge-up wikiPageWikiLink Stellar_nucleosynthesis.
- Dredge-up wikiPageWikiLinkText "Dredge-up".
- Dredge-up wikiPageWikiLinkText "dredge-up".
- Dredge-up wikiPageWikiLinkText "first Dredge-up".
- Dredge-up wikiPageUsesTemplate Template:Astronomy-stub.
- Dredge-up wikiPageUsesTemplate Template:Reflist.
- Dredge-up wikiPageUsesTemplate Template:Star.
- Dredge-up subject Category:Stellar_evolution.
- Dredge-up hypernym Period.
- Dredge-up type Country.
- Dredge-up type Astrophysic.
- Dredge-up comment "A dredge-up is a period in the evolution of a star where a surface convection zone extends down to the layers where material has undergone nuclear fusion. As a result, the fusion products are mixed into the outer layers of the stellar atmosphere where they can appear in the spectrum of the star.The first dredge-up occurs when a main-sequence star enters the red-giant branch.".
- Dredge-up label "Dredge-up".
- Dredge-up sameAs Q129852.
- Dredge-up sameAs Drenatge_(astronomia).
- Dredge-up sameAs Dredge-up.
- Dredge-up sameAs Dragaggio_(astronomia).
- Dredge-up sameAs 汲み上げ効果.
- Dredge-up sameAs 끌어올림.
- Dredge-up sameAs Drumstis_(astronomija).
- Dredge-up sameAs Dragagem_(estrela).
- Dredge-up sameAs m.09rwbv6.
- Dredge-up sameAs Dredge-up.
- Dredge-up sameAs Q129852.
- Dredge-up sameAs 上翻.
- Dredge-up wasDerivedFrom Dredge-up?oldid=632534848.
- Dredge-up isPrimaryTopicOf Dredge-up.