What is CNO cycle?

What is CNO cycle?

The ‘CNO cycle’ refers to the Carbon-Nitrogen-Oxygen cycle, a process of stellar nucleosynthesis in which stars on the Main Sequence fuse hydrogen into helium via a six-stage sequence of reactions.

What is the CNO cycle quizlet?

The CNO cycle is a nuclear fusion cycle involving carbon, nitrogen, and oxygen. It is a more ecient way of fusing hydrogen into helium and is used by stars more massive than our Sun.

What does CNO mean in CNO cycle?

carbon-nitrogen-oxygen cycle
By The Editors of Encyclopaedia Britannica | View Edit History. CNO cycle, in full carbon-nitrogen-oxygen cycle, sequence of thermonuclear reactions that provides most of the energy radiated by the hotter stars.

What is the product of CNO cycle?

The net product of the Carbon-Nitrogen-Oxygen (CNO) cycle is helium and carbon-12.

Why is it called the CNO cycle?

For more massive stars the PP chain can still occur, but there is another sequence of reactions that becomes more favorable for converting hydrogen to helium. It is called the CNO cycle, which stands for the carbon-nitrogen-oxygen cycle.

Where does the CNO cycle occur?

It also occurs at temperatures of 4*10^6 Kelvin (4 million). The Carbon-Nitrogen-Oxygen cycle (or CNO cycle) occurs in stars that are approximately 1.3 times the mass of the sun.

Why do you think it is called CNO cycle?

What do the CNO cycle and the PP chain have in common?

The proton-proton chain and the CNO cycle both convert four hydrogen nuclei into one helium nucleus, releasing energy. Also, because the steps involve protons fusing with carbon and heavier nuclei, the CNO cycle requires a much higher temperature, to overcome the strong Coulomb barrier.

What is the total energy emitted by the CNO cycle?

Hence, the carbon-12 nucleus used in the initial reaction is regenerated in the final one and hence acts as a catalyst for the whole cycle and the total energy released in one cycle is 26.73 MeV (when the two positrons emitted annihilate with two ambient electrons there produces an additional 2.04 MeV).

Why is it called CNO cycle?