Washington photometry of metal-rich globular cluster giants

Details Washington photometry of metal-rich globular cluster giants Washington photometry of metal-rich globular cluster giants

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..847g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Sept. 1986, p. 847-856.

Astronomy and Astrophysics

Astronomy

31

Abundance, Giant Stars, Globular Clusters, Metallic Stars, Stellar Composition, Stellar Spectrophotometry, Cn Emission, Color-Magnitude Diagram, Stellar Temperature

Scientific paper

Photometry on the Washington system is presented for 88 stars in the metal-rich globular clusters NGC 362, M 4, NGC 6352, M 69, NGC 6723, and M 71. Temperatures, abundances, and membership criteria are determined. CN variations are confirmed in NGC 362, M 4, and M71, and a possible CN-strong giant in M 69 is identified. The derived cluster abundances are A/H = -0.9 for NGC 362, -1.45 for M 4, -0.6 for NGC 6352 and M 69, -1.35 for NGC 6723, and -0.7 for M 71, with an uncertainty of 0.1-0.15 dex. With the exception of NGC 362, these abundances are in very good agreement with Zinn's (1985) latest compilation and in poor agreement with values derived from high-dispersion echelle spectroscopy. Possible reasons for the discrepancies are discussed.

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