INVESTIGADORES
PIATTI Andres Eduardo
artículos
Título:
Ages and metallicities of five intermediate-age star clusters projected towards the Small Magellanic Cloud
Autor/es:
PIATTI, ANDRÉS E.; SANTOS JR, JOÂO F.C.; CLARIA OLMEDO, JUAN JOSÉ; BICA, EDUARDO; SARAJEDINI, A.; GEISLER, DOUG
Revista:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Referencias:
Año: 2001 vol. 325 p. 792 - 802
ISSN:
0035-8711
Resumen:
Colour-magnitude diagrams are presented for the first time for L32, L38,
K28 (L43), K44 (L68) and L116, which are clusters projected on to the
outer parts of the Small Magellanic Cloud (SMC). The photometry was
carried out in the Washington system C and T1 filters,
allowing the determination of ages by means of the magnitude difference
between the red giant clump and the main-sequence turn-off, and
metallicities from the red giant branch locus. The clusters have ages in
the range 2-6Gyr, and metallicities in the range
-1.65<[Fe/H]<-1.10, increasing the sample of intermediate-age
clusters in the SMC. L116, the outermost cluster projected on to the
SMC, is a foreground cluster, and somewhat closer to us than the Large
Magellanic Cloud. Our results, combined with those for other clusters in
the literature, show epochs of sudden chemical enrichment in the
age-metallicity plane, which favour a bursting star formation history as
opposed to a continuous one for the SMC.