Evolución química en la Nube Mayor de Magallanes a partir de fotometría de Washington de cúmulos estelares

Piatti, A. E.; Geisler, D.; Sarajedini, A.; Gallart, C.
Referencia bibliográfica

Boletín de la Asociación Argentina de Astronomía, vol.52, p.125-128

Fecha de publicación:
2009
Número de autores
4
Número de autores del IAC
1
Número de citas
0
Número de citas referidas
0
Descripción
From C, T1 Washington photometry in the field of NGC 1697, SL 133, NGC 1997, SL 663, and OHSC 28, five mostly unstudied star clusters 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), the remaining four clusters are of intermediate-age (from 2.2 to 3.0 Gyr) and relatively metal-poor ([Fe/H] = -0.7 dex). We combine our sample with 49 clusters with ages and metal- licities on a similar scale and examine relationships between position in the LMC, age and metallicity. We confirm previous results that clusters younger than 1 Gyr were formed during an outside-in process; this occurred af- ter a burst of cluster formation that took 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 do overlap, particularly on the upper envelope side of the cluster AMR. FULL TEXT IN SPANISH