Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-05-25
2011, AN 332 vol. 5, pp. 467-474
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
AN in press, 9 pages, Highlight talk from Astronomische Gesellschaft 2010 annual meeting
Scientific paper
10.1002/asna.201011561
Star-to-star variations in abundances of the light elements carbon, nitrogen, oxygen, and sodium have been observed in stars of all evolutionary phases in all Galactic globular clusters that have been thoroughly studied. The data available for studying this phenomenon, and the hypotheses as to its origin, have both co-evolved with observing technology; once high-resolution spectra were available even for main-sequence stars in globular clusters, scenarios involving multiple closely spaced stellar generations enriched by feedback from moderate- and high-mass stars began to gain traction in the literature. This paper briefly reviews the observational history of globular cluster abundance inhomogeneities, discusses the presently favored models of their origin, and considers several aspects of this problem that require further study.
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