Journal
ASTRONOMICAL JOURNAL
Volume 127, Issue 1, Pages 373-379Publisher
IOP PUBLISHING LTD
DOI: 10.1086/379561
Keywords
galaxies : individual (Sagittarius dSph); globular clusters : individual (Terzan 7) stars : abundances; stars : late-type
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Chemical abundances in three giants in Terzan 7, a globular cluster associated with the Sagittarius dwarf galaxy, have been determined using high-resolution spectra obtained with the UVES spectrograph on the ESO 8.2 m Kueyen telescope. We find the overall metallicity of the stars to be [Fe/H] = -0.61 +/- 0.07, which is slightly higher than that previously evaluated from photometry and used for the age determination of this cluster. This metallicity yields an age of about 6 Gyr, which is slightly lower than derived from previous estimates. The relative abundance ratios of various chemical elements to iron lie between those of its host galaxy's metal-poor and metal-rich stars and reveal an intriguing similarity to the pattern seen in the Large Magellanic Cloud.
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