Release 11.12 ("Hergest Ridge")
Article ID: gc456 | |
Author | Davidge, T. J.; Ledlow, M.; Puxley, P. |
Title | The Metal-Poor Inner Spheroid Globular Cluster NGC 6558 |
Journal | The Astronomical Journal, Volume 128, Issue 1, pp. 300-311 |
Year of publication | 2004 (on gclusters from 2014-03-19 11:00:24 ) |
Abstract | We discuss near-infrared photometric and spectroscopic observations of stars in and around the globular cluster NGC 6558, obtained with the FLAMINGOS-I imaging spectrograph on the Gemini South telescope. Efforts to estimate the metallicity of NGC 6558 from the slope of the red giant branch (RGB) are biased by contamination from bulge stars. The near-infrared spectroscopic properties of the two brightest stars projected against the main body of the cluster are consistent with them belonging to the bulge. After removing probable bulge members, we find that (1) the brightest metal-poor giant near the center of NGC 6558 has MK=-4.6, which is 1-1.5 mag fainter than the expected RGB tip brightness, and (2) [Fe/H]=-1.5+/-0.5 based on the RGB slope measured from stars that are likely cluster members... |
Tags | NGC 6558 |
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