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The chemical composition of blue horizontal branch stars in M4 and NGC 6397

High-resolution (λ/Δλ ⇒ 18000) spectra of two horizontal branch stars in M4 and one in NGC 6397 provide a metallicity in good agreement with the values obtained previously by others from analyses of cluster red giants. For one HB star in M4, the C, N, O abundances derived from near-infrared C I, N I, and O I lines are consistent with those obtained for red giants by Brown et al. (1990, 1990, AJ, 100). This result suggests that the He-core flash cannot always result in products of He-burning being mixed into the envelope