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

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

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...386..685l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 386, Feb. 20, 1992, p. 685-694. Research supported by Robert A. Welch Found

Other

32

Abundance, Blue Stars, Giant Stars, Globular Clusters, Horizontal Branch Stars, Stellar Spectra, Chemical Composition, High Resolution, Metallicity, Spectrum Analysis, Stellar Atmospheres

Scientific paper

High-resolution (lambda/Delta lambda is approximately equal to 18,000) 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, O I lines are consistent with those obtained for red giants by Brown et al. (1990). The result suggests that the He-core flash cannot always result in products of He-burning being mixed into the envelope.

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