Other
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..627g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 2, Aug. 1992, p. 627-644.
Other
33
Astronomical Photometry, Giant Stars, Globular Clusters, Metallicity, Abundance, Interstellar Extinction, Milky Way Galaxy, Stellar Luminosity, Stellar Temperature
Scientific paper
Photometry on the Washington system is presented for 125 stars in 10 of the most metal-poor Galactic clusters. Luminosity class, temperature, and metal abundance are derived for each star. A new temperature calibration, based on recent model atmosphere calculations by Bell & Gustafson (1989), is presented. Metal abundances are determined using a recently improved calibration which corrects for the decreased metallicity sensitivity of cooler giants and introduces a new temperature index, which significantly reduces the effects of photometric errors and reddening uncertainties in determining abundances for very metal-poor stars. For NGC 6397, M15, M30, and M55, the abundances are well determined and in very good agreement with the abundance scale of Zinn (1983). For five other clusters, including M68 and NGC 2298, 4833, 5897, and 6101, metallicities are derived that are substantially less than those given by Zinn.
Claria Juan J.
Geisler Doug
~Minniti Dante
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