Nucleosynthesis Small Stars

Nucleosynthesis Small Stars-73
Elemente jenseits von Plutonium werden nicht dargestellt.

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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.

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?

Stars like the sun Details were discussed in the section on Fusion.

Periodic table showing origin of elements in the Solar System, based on data by Jennifer Johnson at Ohio State University.By this time the universe had cooled to a few billion kelvins (10 K) and the rate of nucleosynthesis had slowed down significantly.By the time the universe was three minutes old the process had basically stopped and the relative abundances of the elements was fixed at ratios that didn't change for a very long time: 75% hydrogen, 25% helium, with trace amounts of deuterium (hydrogen-2), helium-3, and lithium-7.However, we do see elements higher than iron around us. 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). After that, he worked at the Institute for Astronomy at the University of Hawaii as the Submillimeter Postdoctoral Fellow.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. Jagadheep is currently at the Indian Institute of Space Scence and Technology.The percentages of each element's origin are represented by squares (out of a hundred) to make it easier to estimate proportions; hovering over the SVG image gives precise figures as tooltips. Also see Johnson's explanation at where she cautions "we still don’t know everything..." Periodensystem der Elemente im Sonnensystem nach Jennifer Johnson von der Ohio State University.Die prozentualen Anteile der Herkünfte der Elemente sind durch Kästchen dargestellt (von Hundert) um die Abschätzung der Verhältnisse zu vereinfachen.Almost all the hydrogen and helium present in the universe today (and some of the lithium) were created in the first three minutes after the big bang. There are no stable isotopes (of any element) having atomic masses 5 or 8. The triple-alpha process is not relevant in main sequence (normal) stars like the sun because their core temperatures are too low.All of the other naturally occurring elements were created in stars. You need really massive stars for this — say 20 to 120 times the mass of the sun. The abundance ratio was about seven protons for every neutron.Before one neutron half-life passed nearly every neutron had paired up with a proton, and nearly every one of these pairs had paired up to form helium.


Comments Nucleosynthesis Small Stars

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