Metal-rich globular clusters - Giant branch morphology as a metallicity criterion

Details Metal-rich globular clusters - Giant branch morphology as a metallicity criterion Metal-rich globular clusters - Giant branch morphology as a metallicity criterion

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249l..31o&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. L31-L33.

Astronomy and Astrophysics

Astrophysics

40

Galactic Bulge, Globular Clusters, Metallicity, Morphology, Stellar Spectra, Astronomical Photometry, Charge Coupled Devices, Milky Way Galaxy

Scientific paper

VI CCD photometry of the very metal-rich inner bulge globular clusters NGC 6528, NGC 6553 and Ter 1, and of 47 Tuc and NGC 6356, which are usually called metal-rich clusters, are obtained. The RGB morphology in the V vs. (V-I) and I vs. (V-I) diagrams for ranking the metallicities of these clusters are discussed. The arc-like structure present in their RGB is used, due to blanketing in the cooler giants, as a metallicity criterion, which is corroborated by line strengths in integrated spectra. Criteria of morphological parameters based on RGB inclination for increasing metallicities are proposed. It is concluded that Terzan 1 is the most metal-rich globular cluster of this sample.

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