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On the Iron Content of NGC 1978 in the LMC: A Metal-rich, Chemically Homogeneous Cluster

On the Iron Content of NGC 1978 in the LMC: A Metal-rich, Chemically Homogeneous Cluster,10.1086/506178,Astrophysical Journal,Francesco R. Ferraro,Ale

On the Iron Content of NGC 1978 in the LMC: A Metal-rich, Chemically Homogeneous Cluster   (Citations: 3)
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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 sigma[Fe/H]=0.07 dex dispersion, a mean heliocentric radial velocity vr=293.1+/-0.9 km s-1, and a velocity dispersion sigmavr=3.1 km s-1, thus excluding the presence of a significant metallicity, as well as velocity, spread within the cluster. 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.
Journal: Astrophysical Journal - ASTROPHYS J , vol. 645, no. 1, pp. L33-L36, 2006
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