SIMBAD references

1998AJ....115.1934D - Astron. J., 115, 1934-1945 (1998/May-0)

Ca II triplet spectroscopy of giants in Small Magellanic Cloud star clusters: abundances, velocities, and the age-metallicity relation.

DA COSTA G.S. and HATZIDIMITRIOU D.

Abstract (from CDS):

We have obtained spectra at the Ca II triplet of individual red giants in seven Small Magellanic Cloud (SMC) star clusters whose ages range from ∼4 to 12 Gyr. The spectra have been used to determine mean abundances for six of the star clusters to a typical precision of 0.12 dex. When combined with existing data for other objects, the resulting SMC age-metallicity relation is generally consistent with that for a simple model of chemical evolution, scaled to the present-day SMC mean abundance and gas mass fraction. Two of the clusters (Lindsay 113 and NGC 339), however, have abundances that are ∼0.5 dex lower than that expected from the mean age-metallicity relation. It is suggested that the formation of these clusters, which have ages of ∼5 Gyr, may have involved the infall of unenriched gas, perhaps from the Magellanic Stream. The spectra also yield radial velocities for the seven clusters. The resulting velocity dispersion is 16±4 km.s–1, consistent with those of the SMC planetary nebula and carbon star populations.

Abstract Copyright:

Journal keyword(s): Galaxies: Abundances - Galaxies: Individual: Name: Small Magellanic Cloud - Galaxies: Kinematics and Dynamics - Galaxies: Star Clusters - Galaxies: Magellanic Clouds

Simbad objects: 44

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