On the Iron content of NGC 1978 in the LMC: a metal rich, chemically homogeneous cluster
May, 2006
14 pages
Published in:
- Astrophys.J.Lett. 645 (2006) L33-L36
e-Print:
- astro-ph/0605646 [astro-ph]
DOI:
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Abstract: (arXiv)
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.- globular clusters: individual (NGC 1978)
- Magellanic Clouds
- stars: abundances
- techniques: spectroscopic
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