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Paper: An Eclectic Look at Stellar Compositions
Volume: 390, Pathways Through an Eclectic Universe
Page: 517
Authors: Lambert, D.L.
Abstract: Much effort in stellar spectroscopy is devoted to abundance analyses of stars which satisfy exactly or broadly the hypothesis that the composition of the stellar atmosphere is that of the star’s natal cloud. Studies of Galactic chemical evolution, for example, exploit this hypothesis. This essay, on the contrary, discusses stars for which the hypothesis demonstrably fails because either the star since birth has gained products of nucleosynthesis or other than nuclear processes have operated to change the composition of the atmosphere. This eclectic look comments on diffusion in HgMn stars and in residents of the Spite plateau, the H-deficient cool carbon (HdC) stars, and diverse stars considered to be affected by dust–gas winnowing.
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