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Spectroscopy of Main Sequence Stars in Globular Clusters | | Russell Cannon
; Gary Da Costa
; John Norris
; Laura Stanford
; Barry Croke
; | | Date: |
15 Oct 2002 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/0210324 | | Services: | Forum | Review | PDF | Favorites | |
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