Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-25
Astrophys.J. 645 (2006) L33-L36
Astronomy and Astrophysics
Astrophysics
14 pages, 4 figures, accepted for publication by ApjL
Scientific paper
10.1086/506178
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 the UVES/FLAMES spectrograph at the ESO-Very Large Telescope. We find an iron content of [Fe/H]=-0.38 dex with very low (0.07 dex) dispersion, and a mean heliocentric radial velocity Vr=293.1 (with an error of 0.9 km/s) and a velocity dispersion (3.1 km/s), thus excluding the presence of a significant metallicity, as well as velocity, spread within the cluster.
Carretta Eugenio
Ferraro Francesco R.
Mucciarelli Alessio
Origlia Livia
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