Evoluci\'on qu\'{\i}mica en la Nube Mayor de Magallanes a partir de fotometr\'{\i}a de Washington de c\'ulos estelares

PIATTI, ANDRÉS E.; GEISLER, DOUG; SARAJEDINI, A.; GALLART, C.

Bol. Asoc. Arg.Astronomía

Clariá, J.J., Brandi, E., Piatti, A.E.

Año: 2010 vol. 52 p. 125 - 128

1669-9521

       Abstract. From C, T1 Washington photometry in the field of NGC 1697,SL 133, NGC 1997, SL 663, and OHSC 28, five mostly unstudied star clus-ters in the LMC, we estimate the cluster radii, ages and metallicities.With the exception of NGC 1697 (age = 0.7 Gyr, [Fe/H] = 0.0 dex), theremaining four clusters are of intermediate-age (from 2.2 to 3.0 Gyr) andrelatively metal-poor ([Fe/H] = -0.7 dex). We combine our sample with49 clusters with ages and metallicities on a similar scale and examine re-lationships between position in the LMC, age and metallicity. We confirmprevious results that clusters younger than ∼ 1 Gyr were formed duringan outside-in process; this occurred after a burst of cluster formation thattook place mainly in the outer disk and peaked at ∼ 2 Gyr ago. Finally,the cluster and field AMRs show evidence for a metallicity offset but dooverlap, particularly on the upper envelope side of the cluster AMR.