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The Metal Abundance of Metal-Rich Globular Clusters

Published online by Cambridge University Press:  19 July 2016

Raffaele Gratton
Affiliation:
Astronomical Observatory of Rome
Maria Lucia Quarta
Affiliation:
Institute of Space Physics, Frascati Institute of Astronomy and Geophysics, Sao Paulo
Sergio Ortolani
Affiliation:
Astrophysical Observatory, Asiago

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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.

Type
Chapter VII. Poster Papers on Harlow Shapley and Globular Clusters in the Milky Way
Copyright
Copyright © Kluwer 1988 

References

Caputo, F. 1985 Astron. Astrophys. 147, 317.Google Scholar
Pilachowski, C. A., Sneden, C., and Wallerstein, G. 1983 Astrophys. J. Suppl. 52, 241 (PSW).CrossRefGoogle Scholar
Sneden, C., Lambert, D. L., and Whitaker, R. W. 1979 Astrophys. J. 231, 762.Google Scholar
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