A Chemical Abundance Study of three RHB and two RGB stars in NGC 6637 (M69)

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We present a detailed chemical abundance study of three red horizontal branch and two red giant branch stars in the metal-rich globular cluster NGC 6637 (M69). The value of [Fe/H] derived from LTE calculations is -0.77 ± 0.02 dex. We also discuss the anticorrelation between oxygen and sodium abundances in the program stars and compare the [Si/Ti] ratio of NGC 6637 with those of other globular clusters.

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