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

F. R. Ferraro | Zendy; A. Mucciarelli | Zendy; E. Carretta | Zendy; L. Origlia | Zendy

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

Author(s) -

F. R. Ferraro,

A. Mucciarelli,

E. Carretta,

L. Origlia

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/506178

Subject(s) - metallicity , physics , astrophysics , large magellanic cloud , velocity dispersion , stars , cluster (spacecraft) , spectral line , homogeneous , astronomy , content (measure theory) , radial velocity , dispersion (optics) , galaxy , optics , mathematical analysis , mathematics , computer science , thermodynamics , programming language

We present a detailed abundance analysis of giant stars in NGC 1978, amassive, 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 spectraacquired with the UVES/FLAMES spectrograph at the ESO-Very Large Telescope. Wefind 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 asignificant metallicity, as well as velocity, spread within the cluster.Comment: 14 pages, 4 figures, accepted for publication by Apj

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