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Supernova nucleosynthesis is the nucleosynthesis of chemical elements in supernova explosions.. In sufficiently massive stars, the nucleosynthesis by fusion of lighter elements into heavier ones occurs during sequential hydrostatic burning processes called helium burning, carbon burning, oxygen burning, and silicon burning, in which the byproducts of one nuclear fuel become, after ...
Artist's conception of a white dwarf, right, accreting hydrogen from the Roche lobe of its larger companion star A nova (pl. novae or novas) is a transient astronomical event that causes the sudden appearance of a bright, apparently "new" star (hence the name "nova", Latin for "new") that slowly fades over weeks or months.
The first direct proof that nucleosynthesis occurs in stars was the astronomical observation that interstellar gas has become enriched with heavy elements as time passed. As a result, stars that were born from it late in the galaxy, formed with much higher initial heavy element abundances than those that had formed earlier.
The heavy elements are produced by: nuclear fusion for nuclei up to 34 S; silicon photodisintegration rearrangement and quasiequilibrium during silicon burning for nuclei between 36 Ar and 56 Ni; and rapid capture of neutrons during the supernova's collapse for elements heavier than iron.
Further advances were made, especially to nucleosynthesis by neutron capture of the elements heavier than iron, by Margaret and Geoffrey Burbidge, William Alfred Fowler and Fred Hoyle in their famous 1957 B 2 FH paper, [3] which became one of the most heavily cited papers in astrophysics history.
Family members and friends have begun identifying the 14 people who died in the truck-ramming attack early Wednesday morning on Bourbon Street in New Orleans. The suspect, Shamsud-Din Jabbar, was ...
The difference in the shape of the light curves is believed to be caused, in the case of Type II-L supernovae, by the expulsion of most of the hydrogen envelope of the progenitor star. [29] The plateau phase in Type II-P supernovae is due to a change in the opacity of the exterior layer.
The relationship between heavy metals and heart health The team analyzed data from 6,418 adults who were between ages 45 and 84 and had participated in the Multi-Ethnic Study of Atherosclerosis .