Abstract
We present a detailed abundance analysis of giant stars in NGC 1978, a massive, intermediate-age stellar cluster in the Large Magellanic Cloud, characterized by a high ellipticity and suspected to have a metallicity spread. We analyzed 11 giants, all cluster members, by using high-resolution spectra acquired with UVES/FLAMES at the ESO Very Large Telescope. We find an iron content of [Fe/H] = -0.38 dex with very low σ[Fe/H] = 0.07 dex dispersion, a mean heliocentric radial velocity vr = 293.1 ± 0.9 km s-1, and a velocity dispersion σ = 3.1 km s-1, thus excluding the presence of a significant metallicity, as well as velocity, spread within the cluster.
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Footnotes
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Based on observations collected at the Very Large Telescope of the European Southern Observatory (ESO), Cerro Paranal, Chile, under programs 072.D-0342 and 074.D-0369.