Stellar nucleosynthesis is the creation (nucleosynthesis) of chemical elements by nuclear fusion reactions within stars. Stellar nucleosynthesis has occurred.
Table of contents
- How are light and heavy elements formed? (Advanced) - Curious About Astronomy? Ask an Astronomer
- How Elements from Hydrogen and Helium Are Created
- Viewpoint: Stellar Abundances: Better Measured Than Predicted
- Heidelberg scientist shows that silver and gold materialised in different stellar explosions.
I have some basic understanding of how this is done, and I have also found some technical information that at this time I don't understand. Can you point me to some good articles on the topic, or perhaps cover some more advanced materials yourself? The lightest elements hydrogen, helium, deuterium, lithium were produced in the Big Bang nucleosynthesis.
According to the Big Bang theory, the temperatures in the early universe were so high that fusion reactions could take place. This resulted in the formation of light elements: hydrogen, deuterium, helium two isotopes , lithium and trace amounts of beryllium.
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- Stellar Nucleosynthesis: How Stars Make All of the Elements?
- Can Giant Stars Fuse To Form Gold?.
- Stellar Nucleosynthesis and Cosmochemistry.
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- New Research Shows How Stars Turn to Gold!
Nuclear fusion in stars converts hydrogen into helium in all stars. In stars less massive than the Sun, this is the only reaction that takes place. In stars more massive than the Sun but less massive than about 8 solar masses , further reactions that convert helium to carbon and oxygen take place in succesive stages of stellar evolution. In the very massive stars, the reaction chain continues to produce elements like silicon upto iron.
Elements higher than iron cannot be formed through fusion as one has to supply energy for the reaction to take place.
How are light and heavy elements formed? (Advanced) - Curious About Astronomy? Ask an Astronomer
However, we do see elements higher than iron around us. So how did these elements form? The answer is supernovae. In a supernova explosion, neutron capture reactions take place this is not fusion , leading to the formation of heavy elements. This is the reason why it is said that most of the stuff that we see around us come from stars and supernovae the heavy elements part.
How Elements from Hydrogen and Helium Are Created
If you go into technical details, then there are two processes of neutron capture called rapid process r-process and the slow process s-process , and these lead to formation of different elements. Big Bang nucleosynthesis. Fusion in stars like the Sun. Jagadheep built a new receiver for the Arecibo radio telescope that works between 6 and 8 GHz. He studies 6.
These masers occur at sites where massive stars are being born. He got his Ph. How are light and heavy elements formed? For more details, refer the following websites: 1. Big Bang nucleosynthesis 2.
Fusion in stars like the Sun 3. By fusion reactions of light nuclei, heavier and heavier elements are formed up to iron. Then the fusion stops, because the formation of heavier nuclei require external inputs of energy. From Iron to uranium The central core of very massive stars is rich in iron, the most stable nucleus in nature created from previous nuclear fusion. How to explain then the presence of heavier nuclei in the universe, some very heavy like radioactive thorium and uranium radioactive? It is believed that during supernovae explosion an extraordinarily intense neutron flux is produced.
Viewpoint: Stellar Abundances: Better Measured Than Predicted
Bombarded by such a flux, the iron nuclei grow very rapidly through successive neutron captures. These nuclei would follow on the nuclear chart a path that would take them away from the line of stability in red.
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Later, subsequent beta decays will transform then into the heavy elements that we know. The dispersion of the stellar material The Crab nebula is the remnant of a supernova explosion that occurred years ago in our galaxy and that has been observed on Earth in by Chinese astronomers and Navajo. The supernova phenomenon is due to the explosion of a big star at the end of life.
During such explosions are produced by a rapid succession of neutron captures, elements heavier than iron, such as platinum, gold or uranium. The discovery allowed the team to put a limit on the metals certain types of supernovae can create.
Heidelberg scientist shows that silver and gold materialised in different stellar explosions.
What's more, she said, "it seems that this weak r-process can be connected to supernovae of much lower masses than what we thought earlier. So while the amount of the metal ejected by a single star may be quite low—as little as a billionth of the original mass of the star—these silver-producing supernovae may be more widespread than their larger, gold-producing cousins.
That cosmic disparity, Hansen said, may help explain why silver on Earth is so much more abundant than gold. Illustration by M.
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