Other
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phdt.........6g&link_type=abstract
Ph.D. Thesis Washington Univ., Seattle.
Other
15
Abundance, Globular Clusters, Metallic Stars, Opacity, Open Clusters, Temperature, Aluminum, High Resolution, Iron, Magnesium, Oxygen, Silicon, Sodium, Spectrum Analysis
Scientific paper
Abundances were determined for a number of open and globular clusters in the Galaxy from Washington photometry and echelle spectroscopy. A (Mgl(b) + MgH) filter was added to the Washington system to discriminate between cluster giants and foreground dwarfs. Additional membership information was obtained from medium and high resolution spectra. After eliminating nonmembers, the mean cluster Washington metallicity agrees with the echelle (Fe/H) to within + or 0.3 dex. Combining the metallicity determinations, three classical metal-rich globulars - NGC 6352, M 69, and M71 - have (Fe/H) - 1, confirming the new metallicity scale. Three other globulars - NGC 362, M4, and NGC 6723 - have very similar (Fe/H) values. No globular clusters studied with Washington photometry or echelle spectroscopy have (Fe/H) values -1. Several old open clusters - including NGC 2141, 2158, 2506, and Melotte 66 - have (Fe/H) values that lie within the range-0.65 to - 1.2, Thus the metallicities of the most metal-poor open clusters overlap with those of the metal-rich globulars.
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