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

Ferraro, Francesco R ; Mucciarelli, Alessio ; Carretta, Eugenio ; Origlia, Livia

The Astrophysical journal, 2006-07, Vol.645 (1), p.L33-L36 [Periódico revisado por pares]

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Título:
On the Iron Content of NGC 1978 in the LMC: A Metal-rich, Chemically Homogeneous Cluster
Autor: Ferraro, Francesco R ; Mucciarelli, Alessio ; Carretta, Eugenio ; Origlia, Livia
Assuntos: Astronomy ; Earth, ocean, space ; Exact sciences and technology
É parte de: The Astrophysical journal, 2006-07, Vol.645 (1), p.L33-L36
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: 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 s sub([Fe/H]) = 0.07 dex dispersion, a mean heliocentric radial velocity v sub(r) = 293.1 c 0.9 km s super(-1), and a velocity dispersion s super(vr) = 3.1 km s super(-1), thus excluding the presence of a significant metallicity, as well as velocity, spread within the cluster.
Editor: Chicago, IL: IOP Publishing
Idioma: Inglês

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