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Encyclopedia > Carbon burning process

The carbon burning process is a nuclear fusion reaction that occurs in massive stars (at least 4 MSun at birth) that have used up the lighter elements in their cores. It requires high temperatures (6×108 K) and densities (about 2×108 kg/m3). The deuterium-tritium fusion reaction is considered the most promising for producing fusion power. ... The Pleiades star cluster A star is any massive gaseous body in outer space, just like the Sun. ... In astronomy, the solar mass is a unit of mass used to express the mass of stars and larger objects such as galaxies. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ...

12C + 12C 24Mg + γ
23Mg + n
23Na + 1H
20Ne + 4He
16O + 24He

Carbon burning starts when Helium burning ends. During helium burning, stars build up an inert core rich in carbon and oxygen. Once helium is consumed in the core, it collapses due to gravitation. This decrease in volume raises temperature and density of the core up to the carbon ignition temperature. This will raise the star's temperature around the core allowing it to burn helium in a shell around the core. The star increases in size and becomes a red supergiant. General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... General Name, Symbol, Number magnesium, Mg, 12 Chemical series alkaline earth metals Group, Period, Block 2, 3, s Appearance silvery white Atomic mass 24. ... This article is about electromagnetic radiation. ... Properties In physics, the neutron is a subatomic particle with no net electric charge and a mass of 939. ... General Name, Symbol, Number sodium, Na, 11 Chemical series alkali metals Group, Period, Block 1, 3, s Appearance silvery white Atomic mass 22. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... General Name, Symbol, Number neon, Ne, 10 Chemical series noble gases Group, Period, Block 18, 2, p Appearance colorless Atomic mass 20. ... General Name, Symbol, Number helium, He, 2 Chemical series noble gases Group, Period, Block 18, 1, s Appearance colorless Atomic mass 4. ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals Group, Period, Block 16, 2, p Appearance colorless Atomic mass 15. ...


As carbon burns, reaction products (O, Mg, Ne) accumulate in a new inert core. After some one thousand years the star will run out of carbon, and the core cools down again and contracts. This heats up the core up to the Neon ignition (see Neon burning process). Around the core carbon continues to burn in a shell, and continuing outwards there is a helium burning shell and a hydrogen burning shell. Neon burning process is a set of nuclear fusion reactions that take place in massive stars (at least 8 MSun). ...


At this point, stars with masses between 4 and 8 solar masses destabilize and eject the envelope in a massive stellar wind, leaving behind a O-Ne-Mg white dwarf core. White dwarf Sirius-B in x-rays A white dwarf is an astronomical object which is produced when a low to medium mass star dies. ...


Stars with bigger masses proceed with Neon burning process, but the evolution from now on is so quick that the envelope usually can no longer respond. Neon burning process is a set of nuclear fusion reactions that take place in massive stars (at least 8 MSun). ...


 
 

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