Astronomy and Astrophysics, volume 501, 585-593 (2009/7-2)
Washington photometry of five star clusters in the Large Magellanic Cloud.
PIATTI A.E., GEISLER D., SARAJEDINI A. and GALLART C.
Abstract (from CDS):
We present CCD photometry in the Washington system C and T1 passbands down to T1∼22.5 in the fields of NGC1697, SL133, NGC1997, SL663, and OHSC28, five mostly unstudied star clusters in the LMC. Cluster radii were estimated from star counts in appropriate-sized boxes distributed throughout the entire observed fields. We perform a detailed analysis of the field star contamination and derive cluster colour-magnitude diagrams (CMDs). Based on the best fits of isochrones computed by the Padova group to the (T1, C-T1) CMDs, the δ(T1) index and the Standard Giant Branch procedure, we derive metallicities and ages for the five clusters. We combine our sample with clusters with ages and metallicities on a similar scale and examine relationships between position in the LMC, age and metallicity. With the exception of NGC1697 (age=0.7Gyr, [Fe/H]=0.0dex), the remaining four clusters are of intermediate-age (from 2.2 to 3.0Gyr) and relatively metal-poor ([Fe/H]=-0.7dex). The cluster and field age-metallicty realtions show evidence for a metallicity offset but do overlap, particularly on the upper envelope side of the cluster age-metallicity relation. We confirm previous results that clusters younger than ∼1Gyr were formed during an outside-in process; this occurred after a burst of cluster formation that took place mainly in the outer disk and peaked at ∼2Gyr ago.
techniques: photometric - galaxies: individual: LMC - Magellanic Clouds - galaxies: star clusters - stars: Hertzsprung-Russell (HR) and C-M diagrams
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<Available at CDS (J/A+A/501/585): table2.dat table3.dat table4.dat table5.dat table6.dat>
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