Abstract
The relationship between chemical abundances in gaseous nebulae and element building processes in stars remains one of the most challenging problems in astrophysics. There are several aspects that merit examination:
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1)
The linkage between nucleogenesis and nebular chemical compositions is best defined for planetaries and a few other objects where we study the ejecta from a single star. How can theories of stellar evolution help us understand these objects?
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2)
Although a large fraction of the stellar population probably evolves into planetaries, the role of very massive O, of, and Wolf-Rayet (WR) stars is extremely important because these objects can return highly processed material, either through a stellar wind, through demise as a supernova, or both, and have a possible role in the origin of cosmic rays.
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3)
In particular, supernovae (although few in number) have a great effect on the chemistry of the ambient interstellar medium. Especially enlightening are a few objects such as Cas A where the chemical composition of the individual fragments of the detonation can be studied.
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References
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© 1984 D. Reidel Publishing Company, Dordrecht, Holland
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Aller, L.H. (1984). Nebular Compositions, Element Building, and Stellar Evolution. In: Physics of Thermal Gaseous Nebulae. Astrophysics and Space Science Library, vol 112. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-9639-3_12
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DOI: https://doi.org/10.1007/978-94-010-9639-3_12
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