Abstract
We think that it is possible to find the correct scale of abundance for metal-rich globular clusters thanks to the new generation of spectrographs, equipped with CCD cameras. We analyzed giants in ten globular clusters and Arcturus using high dispersion spectra acquired through the CASPEC spectrograph at the 3.6 m telescope at La Silla. The detector was an RCA CCD. Stars cooler than 4150 K were avoided since their absorption spectrum is too strong. By a comparison with standard Arcturus spectra, we found a small trend to overestimate equivalent widths. This systematic error affects the derived abundances only marginally. However, too large equivalent widths must produce too large metal abundances. Abundances were derived following a standard procedure.
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© 1988 IAU
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Gratton, R., Quarta, M.L., Ortolani, S. (1988). The Metal Abundance of Metal-Rich Globular Clusters. In: Grindlay, J.E., Davis Philip, A.G. (eds) The Harlow-Shapley Symposium on Globular Cluster Systems in Galaxies. International Astronomical Union / Union Astronomique Internationale, vol 126. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-1104-9_77
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DOI: https://doi.org/10.1007/978-94-015-1104-9_77
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