Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-10-15
Astronomy and Astrophysics
Astrophysics
9 pages, 3 eps figures, to appear in `New Horizons in Globular Cluster Astronomy', Padova, June 2002, ASP conf. series
Scientific paper
Although globular clusters are generally chemically homogeneous, substantial abundance variations are sometimes seen even among unevolved main sequence stars, especially for the CNO group of elements. Multi-object intermediate-dispersion spectroscopic systems are now being used to determine the patterns of abundance variations for large samples of stars, while high dispersion spectrographs on 8m-class telescopes are providing good spectra of individual faint stars. In some circumstances the spectra of many similar stars can be combined to yield extremely high S/N spectra. The sample of clusters which has been studied remains small, but it seems that many of the more metal-rich clusters must have experienced some sort of self-enrichment, either in a proto-cluster stage, or through successive episodes of star formation or some other processes early in their lives. The metal-poor clusters provide equally clear evidence for internal mixing and dredge-up of processed material within evolving red giant stars.
Cannon Russell
Costa Gary Da
Croke Barry
Norris John
Stanford Laura
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