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Metal abundances of the metal-rich globular clusters

H. A. Smith

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Abstract

Infrared photometry of red giant stars in NGC 6712, low-resolution spectroscopy of red giants in four globular clusters, and ΔS metallicity measures for RR Lyrae stars in six globular clusters are used to establish the metal abundance scale of the relatively metal-rich globular clusters. 47 Tuc is found to be at [Fe/H] = -0.6±0.2, while M5 is more metal poor at [Fe/H] = -1.2. In contrast to the results from echelle studies of globular cluster giants, giant branch temperature is found to correlate well with metal abundance.

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What this paper is about

Infrared photometry of red giant stars in NGC 6712, low-resolution spectroscopy of red giants in four globular clusters, and ΔS metallicity measures for RR Lyrae stars in six globular clusters are used to establish the metal abundance scale of the relatively metal-rich globular clusters. 47 Tuc is found to be at [Fe/H] = -0.6±0.2, while M5 is more metal poor at [Fe/H] = -1.2. In contrast to the results from echelle studies of globular cluster giants, giant branch temperature is found to correlate well with metal abundance.

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Available abstract

Infrared photometry of red giant stars in NGC 6712, low-resolution spectroscopy of red giants in four globular clusters, and ΔS metallicity measures for RR Lyrae stars in six globular clusters are used to establish the metal abundance scale of the relatively metal-rich globular clusters. 47 Tuc is found to be at [Fe/H] = -0.6±0.2, while M5 is more metal poor at [Fe/H] = -1.2. In contrast to the results from echelle studies of globular cluster giants, giant branch temperature is found to correlate well with metal abundance.

Key concepts: Globular cluster, Physics, Metal, Astrophysics, Astronomy, Astrobiology, Stars, Metallurgy

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