The metal abundances of RR Lyrae stars in the globular clusters NGC 6712 and NGC 6723

Details The metal abundances of RR Lyrae stars in the globular clusters NGC 6712 and NGC 6723 The metal abundances of RR Lyrae stars in the globular clusters NGC 6712 and NGC 6723

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..719s&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 15, 1981, p. 719-722.

Astronomy and Astrophysics

Astrophysics

19

Blue Stars, Giant Stars, Globular Clusters, Lyra Constellation, Metallic Stars, Stellar Spectra, Abundance, H Lines, Iron, Red Giant Stars, Stellar Spectrophotometry

Scientific paper

The spectroscopic metal abundance parameter A S has been measured for RR Lyrae stars in the globular clusters NGC 6712 and NGC 6723. Mean ΔS values are 2.6±0.4 for NGC 6712 and 2.8±0.5 for NGC 6723, corresponding to [Fe/H] ∼-0.7 on Butler's abundance scale. This iron abundance is considerably higher than those found for 47 Tuc and M7l in recent analyses of high dispersion spectra of red giant stars.

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