A photometric metallicity scale for globular clusters based on stars with known curve of growth chemical abundances

Details A photometric metallicity scale for globular clusters based on stars with known curve of growth chemical abundances A photometric metallicity scale for globular clusters based on stars with known curve of growth chemical abundances

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139...79n&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 1, Oct. 1984, p. 79-84.

Astronomy and Astrophysics

Astrophysics

7

Giant Stars, Globular Clusters, Metallicity, Stellar Spectrophotometry, Abundance, Astronomical Catalogs, Errors

Scientific paper

Intermediate-band Walraven photometry has been obtained for 53 giants in six galactic globular clusters. Using a previously established calibration of VBLUW colour indices in terms of [Fe/H], the metallicities of the individual giants are determined. The reliability of the method of individual giant photometry, calibrated by stars with curve-of-growth abundances, is discussed with respect to other methods. The photometry of individual giants leads to the same ranking of globular cluster abundances as from parameters related to the morphology of the colour-magnitude diagram, but it leads to severe discrepancies with metallicities derived by integrated properties of the clusters. Furthermore, while the calibration of photometric indices by curve-of-growth abundances (catalogue of Cayrel de Strobel et al., 1980) is possible with a high degree of correlation, the agreement with the metallicities from spectrum synthesis of the key objects 47 Tuc, NGC 288 and NGC 362 is poor.

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