Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...179..181g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 179, no. 1-2, June 1987, p. 181-192.
Astronomy and Astrophysics
Astrophysics
56
Globular Clusters, Metallicity, Stellar Composition, Stellar Spectra, High Dispersion Spectrographs, Spectral Line Width, Spectrum Analysis, Stellar Atmospheres
Scientific paper
The metal abundance of five globular clusters (NGC 288, NGC 362, NGC 5897, NGC 6352 and NGC 6362) is derived from high dispersion spectra obtained with the CASPEC spectrograph. The spectra are analysed both by a traditional line analysis method and by a quantitative comparison with synthetic spectra. The two techniques agree for logarithmic abundance [Fe/H] > -1.5. The derived iron abundances span the range -1.9 < [Fe/H] < -0.7. NGC 6352 is the most metal rich and NGC 5897 is the most metal poor cluster so far analysed in this series of papers. The metallicity scale obtained by Gratton et al. (1986) is confirmed by the present observations. Abundances from high dispersion spectra now correlate well with the Q39 index and the red giant branch abundance indicators.
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