Metallicity of the star III-17 in the bulge globular cluster NGC 6553

Details Metallicity of the star III-17 in the bulge globular cluster NGC 6553 Metallicity of the star III-17 in the bulge globular cluster NGC 6553

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..607b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. 607-613.

Astronomy and Astrophysics

Astrophysics

38

Color-Magnitude Diagram, Cool Stars, Galactic Bulge, Globular Clusters, Metallicity, Charge Coupled Devices, Echelette Gratings, Milky Way Galaxy

Scientific paper

CCD echelle spectra were obtained at the 3.6 m telescope at ESO for the star III-17 of the metal-rich globular cluster NGC 6553. This cluster was chosen because it is a relatively close bulge globular cluster and also it presented the possibility to be among the most metal-rich ones in the Galaxy. The metallicity of the star III-17 is derived by fitting synthetic spectra to the spectrum observed in the wavelength region 475 - 580 nm. We derived an overall metallicity of M/H = -0.2 +0.2, -0.4, therefore approximately solar, whereas there may be an evidence for a CNO overabundance. Further observations of individual stars in NGC 6553 are necessary in order to definitely establish its metallicity.

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