Metal-rich globular clusters : giant branch morphology as a metallicity Criterion

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Date
1991Type
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Abstract
We have obtained 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. We discuss the RGB morphology in the V vs. (V-I) and I vs. (V-I) diagrams for ranking the metallicities of these clusters. We used the arc-like structure present in their RGB, due to blanketing in the cooler giants, as a metallicity criterion, which is corroborated by line strengths in integrated spectra. ...
We have obtained 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. We discuss the RGB morphology in the V vs. (V-I) and I vs. (V-I) diagrams for ranking the metallicities of these clusters. We used the arc-like structure present in their RGB, due to blanketing in the cooler giants, as a metallicity criterion, which is corroborated by line strengths in integrated spectra. We propose criteria of morphological parameters based on RGB inclination for increasing metallicities. We conclude that Terzan 1 is the most metal-rich globular cluster of this sample. ...
In
Astronomy and Astrophysics. Berlin. Vol. 249, no. 2 (Sept. 1991), p. L31-L33
Source
Foreign
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Journal Articles (26212)Exact and Earth Sciences (4578)
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