INVESTIGADORES
PIATTI Andres Eduardo
congresos y reuniones científicas
Título:
Edades y metalicidades de cinco cúmulos estelares proyectados en dirección a la Nube Menor de Magallanes: implicaciones sobre los procesos de formación y evolución de estos sistemas
Autor/es:
PIATTI, ANDRÉS E.; SANTOS JR, JOÂO F.C.; CLARIA OLMEDO, JUAN JOSÉ; BICA, EDUARDO; SARAJEDINI, A.; GEISLER, DOUG
Lugar:
Tucumán
Reunión:
Congreso; Reunión Anual de la Asoc. Argentina de Astronomía; 2000
Resumen:
Washington photometry of the 5 star clusters Lindsay 32, Lindsay 38,
Kron 28, Kron 44 and Lindsay 116 and their surrounding fields located
towards the Small Magellanic Cloud (SMC) is presented for the first
time. From the color-magnitude diagrams, cleaned from field stars
contamination, the cluster and SMC field reddenings, ages and
metallicities are determined. The ages - derived from the difference in
the T1 magnitude betweem the giant clump and the Main
Sequence turnoff point - vary between 2 and 6 Gyr, and the metallicities
([Fe/H]) between -1.65 and -1.10. Lindsay 116 is located closer to the
Large Magellanic Cloud (LMC) than to the SMC and its fundamental
parameters suggests a higher probability of belonging to the LMC. The
results obtained in this work, combined with previous estimates of age
and metallicity for other seven clusters, allow us to draw the following
conclusions: (1) There does not exist an age-position relation in the
SMC, but a age-metallicity one. (2) The chemical enrichment in the SMC
has been very efficient during the last 5 Gyr. (3) The SMC clusters
formation and evolution can be better represented by a bursting star
formation process than by a continuum star formation mechanism.